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Mohs 6 minerals

The reference mineral for 6 is orthoclase.

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479 minerals · Mohs 6 minerals
GroupFeldspar specimen
Feldspar (K,Na,Ca)(Al,Si)₄O₈
SilicateTriclinicMohs 6–6.5
Hematite specimen
Hematite Fe₂O₃
Oxides & HydroxideHexagonalMohs 5–6
Jade specimen
Jade Jadeite or nephrite
SilicateMonoclinicMohs 6–7
Jadeite specimen
Jadeite NaAlSi₂O₆
SilicateMonoclinicMohs 6–7
VarietyLabradorite specimen
Labradorite (Ca,Na)(Al,Si)₄O₈
SilicateTriclinicMohs 6–6.5
Magnetite specimen
Magnetite Fe²⁺Fe³⁺₂O₄
Oxides & HydroxideCubicMohs 5.5–6.5
VarietyMoonstone specimen
Moonstone KAlSi₃O₈
SilicateMonoclinicMohs 6–6.5
Opal specimen
Opal SiO₂·nH₂O
SilicateHexagonalMohs 5.5–6.5
Pyrite specimen
Pyrite FeS₂
SulfideCubicMohs 6–6.5
Rhodonite specimen
Rhodonite CaMn₃Mn(Si₅O₁₅)
SilicateTriclinicMohs 5.5–6.5
Sodalite specimen
Sodalite Na₄(Si₃Al₃)O₁₂Cl
SilicateCubicMohs 5.5–6
VarietyTanzanite specimen
Tanzanite Ca₂Al₃(SiO₄)₃(OH)
SilicateOrthorhombicMohs 6–7
Turquoise specimen
Turquoise CuAl₆(PO₄)₄(OH)₈·4H₂O
PhosphateTriclinicMohs 5–6
Actinolite specimen
Actinolite Ca₂(Mg₄.₅₋₂.₅Fe²⁺₀.₅₋₂.₅)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Aegirine specimen
Aegirine NaFe³⁺Si₂O₆
SilicateMonoclinicMohs 6–6.5
A
Aeschynite-(Ce) (Ce,Ca,Fe,Th)(Ti,Nb)₂(O,OH)₆
Oxides & HydroxideOrthorhombicMohs 5–6
A
Aeschynite-(Nd) (Nd,Ln,Ca)(Ti,Nb)₂(O,OH)₆
Oxides & HydroxideOrthorhombicMohs 5–6
Aeschynite-(Y) specimen
Aeschynite-(Y) (Y,Ln,Ca,Th)(Ti,Nb)₂(O,OH)₆
Oxides & HydroxideOrthorhombicMohs 5–6
Afghanite specimen
Afghanite (Na,K)₂₂Ca₁₀(Si₂₄Al₂₄)O₉₆(SO₄)₆Cl₆
SilicateHexagonalMohs 5.5–6
A
Agakhanovite-(Y) YCa   ₂KBe₃Si₁₂O₃₀
SilicateHexagonalMohs 6
Akatoreite specimen
Akatoreite Mn²⁺₉Al₂Si₈O₂₄(OH)₈
SilicateTriclinicMohs 6
Albite specimen
Albite Na(AlSi₃O₈)
SilicateTriclinicMohs 6–6.5
A
Allabogdanite (Fe,Ni)₂P
Native ElementOrthorhombicMohs 5–6
GroupAllanite specimen
Allanite (Ca,Ce)₂(Al,Fe)₃Si₃O₁₂(OH)
SilicateMonoclinicMohs 5.5–6
Allanite-(Ce) specimen
Allanite-(Ce) CaCe(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 5.5–6
A
Allanite-(La) CaLa(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6
Allanite-(Nd) specimen
Allanite-(Nd) CaNd(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6
A
Alluaivite Na₁₉(Ca,Mn²⁺)₆(Ti,Nb)₃Si₂₆O₇₄Cl·2H₂O
SilicateHexagonalMohs 5–6
Almeidaite specimen
Almeidaite PbZn₂(Mn,Y)(Ti,Fe³⁺)₁₈O₃₆(OH,O)₂
Oxides & HydroxideHexagonalMohs 6
A
Alnaperbøeite-(Ce) (CaCe₂.₅Na₀.₅)(Al₄)(Si₂O₇)(SiO₄)₃O(OH)₂
SilicateMonoclinicMohs 6–7
Alpeite specimen
Alpeite Ca₄Mn³⁺₂Al₂(Mn³⁺Mg)(SiO₄)₂(Si₃O₁₀)(VO₄)(OH)₆
SilicateOrthorhombicMohs 5.5–6
Aluminosugilite specimen
Aluminosugilite KNa₂Al₂Li₃Si₁₂O₃₀
SilicateHexagonalMohs 6–6.5
A
Amamoorite CaMn²⁺₂Mn³⁺(Si₂O₇)O(OH)
SilicateMonoclinicMohs 6
VarietyAmazonite specimen
Amazonite KAlSi₃O₈
SilicateTriclinicMohs 6–6.5
Amblygonite specimen
Amblygonite LiAl(PO₄)F
PhosphateTriclinicMohs 5.5–6
Aminoffite specimen
Aminoffite Ca₃(BeOH)₂Si₃O₁₀
SilicateTetragonalMohs 5.5–6
GroupAmphibole specimen
Amphibole A₀₋₁B₂C₅T₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6.5
Anatase specimen
Anatase TiO₂
Oxides & HydroxideTetragonalMohs 5.5–6
VarietyAndesine specimen
Andesine (Ca,Na)(Al,Si)₄O₈
SilicateTriclinicMohs 6–6.5
Anorthite specimen
Anorthite Ca(Al₂Si₂O₈)
SilicateTriclinicMohs 6–6.5
Anthophyllite specimen
Anthophyllite Mg₂Mg₅Si₈O₂₂(OH)₂
SilicateOrthorhombicMohs 5.5–6
A
Arapovite (K₁₋ₓ   ₓ)(Ca,Na)₂U⁴⁺Si₈O₂₀ [x ≈ 0.5]
SilicateTetragonalMohs 5.5–6
Ardennite-(V) specimen
Ardennite-(V) Mn²⁺₄Al₄(AlMg)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆
SilicateOrthorhombicMohs 6–7
Arfvedsonite specimen
Arfvedsonite NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
A
Argutite GeO₂
Oxides & HydroxideTetragonalMohs 6–7
A
Arsenoclasite Mn²⁺₅(AsO₄)₂(OH)₄
ArsenateOrthorhombicMohs 5–6
Arsenopyrite specimen
Arsenopyrite FeAsS
SulfosaltMonoclinicMohs 5.5–6
Augite specimen
Augite (Ca,Mg,Fe)₂Si₂O₆
SilicateMonoclinicMohs 5.5–6
Awaruite specimen
Awaruite Ni₃Fe
Native ElementCubicMohs 5.5–6
Babingtonite specimen
Babingtonite Ca₂Fe²⁺Fe³⁺Si₅O₁₄(OH)
SilicateTriclinicMohs 5.5–6
Baghdadite specimen
Baghdadite Ca₆Zr₂(Si₂O₇)₂O₄
SilicateMonoclinicMohs 6
Baotite specimen
Baotite Ba₄(Ti,Nb,W)₈O₁₆(SiO₃)₄Cl
SilicateTetragonalMohs 6
Barbosalite specimen
Barbosalite Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂
PhosphateMonoclinicMohs 6
B
Barroisite (NaCa)(Mg₃Al₂)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Batiferrite specimen
Batiferrite BaTi₂Fe³⁺₈Fe²⁺₂O₁₉
Oxides & HydroxideHexagonalMohs 6
Batisite specimen
Batisite Na₂BaTi₂O₂(Si₂O₆)₂
SilicateOrthorhombicMohs 6
Belkovite specimen
Belkovite Ba₃Nb₆(Si₂O₇)₂O₁₂
SilicateHexagonalMohs 6–7
Bementite specimen
Bementite Mn₇Si₆O₁₅(OH)₈
SilicateMonoclinicMohs 4.5–6
Benitoite specimen
Benitoite BaTiSi₃O₉
SilicateHexagonalMohs 6–6.5
Berdesinskiite specimen
Berdesinskiite V³⁺₂TiO₅
Oxides & HydroxideMonoclinicMohs 6–6.5
Bertossaite specimen
Bertossaite Li₂CaAl₄(PO₄)₄(OH)₄
PhosphateOrthorhombicMohs 6
Bertrandite specimen
Bertrandite Be₄Si₂O₇(OH)₂
SilicateOrthorhombicMohs 6–7
Beryllonite specimen
Beryllonite NaBe(PO₄)
PhosphateMonoclinicMohs 5.5–6
Bikitaite specimen
Bikitaite LiAlSi₂O₆·H₂O
SilicateTriclinicMohs 6
Bixbyite-(Fe) specimen
Bixbyite-(Fe) Fe³⁺₂O₃
Oxides & HydroxideCubicMohs 6–6.5
Blatterite specimen
Blatterite Sb⁵⁺₃Mn³⁺₉Mn²⁺₃₅(BO₃)₁₆O₃₂
BorateOrthorhombicMohs 6
B
Bohseite Ca₄Be₃₊ₓAl₁₋ₓSi₉O₂₅₋ₓ(OH)₃₊ₓ (x = 0 to 1)
SilicateOrthorhombicMohs 5–6
Braunite specimen
Braunite Mn²⁺Mn³⁺₆O₈(SiO₄)
SilicateTetragonalMohs 6–6.5
Britholite-(Y) specimen
Britholite-(Y) (Y,Ca)₅(SiO₄)₃(OH)
SilicateMonoclinicMohs 6
Brookite specimen
Brookite TiO₂
Oxides & HydroxideOrthorhombicMohs 5.5–6
Burpalite specimen
Burpalite Na₄Ca₂Zr₂(Si₂O₇)₂F₄
SilicateMonoclinicMohs 5–6
Bustamite specimen
Bustamite Mn₂Ca₂MnCa(Si₃O₉)₂
SilicateTriclinicMohs 5.5–6.5
Byelorussite-(Ce) specimen
Byelorussite-(Ce) NaBa₂Ce₂Mn²⁺Ti₂Si₈O₂₆(F,OH)·H₂O
SilicateOrthorhombicMohs 5.5–6
VarietyBytownite specimen
Bytownite (Ca,Na)(Al,Si)₄O₈
SilicateTriclinicMohs 6–6.5
Cafarsite specimen
Cafarsite (Ca,Na,   )₁₉Ti₈Fe³⁺₄Fe²⁺₄(AsO₃)₂₈F
ArsenateCubicMohs 5.5–6
C
Calciosamarskite (Ca,Fe,Y)(Nb,Ta,Ti)O₄
Oxides & HydroxideMonoclinicMohs 5–6
Calzirtite specimen
Calzirtite Ca₂Zr₅Ti₂O₁₆
Oxides & HydroxideTetragonalMohs 6–7
Cancrinite specimen
Cancrinite (Na,Ca,   )₈(Al₆Si₆)O₂₄(CO₃,SO₄)₂·2H₂O
SilicateHexagonalMohs 5–6
C
Canosioite Ba₂Fe³⁺(AsO₄)₂(OH)
ArsenateMonoclinicMohs 6–6.5
Cappelenite-(Y) specimen
Cappelenite-(Y) BaY₆B₆Si₃O₂₄F₂
SilicateHexagonalMohs 6–6.5
C
Capranicaite KCaNaAl₄B₄Si₂O₁₈
SilicateMonoclinicMohs 6
Carpholite specimen
Carpholite Mn²⁺Al₂Si₂O₆(OH)₄
SilicateOrthorhombicMohs 5.5–6
Cassiterite specimen
Cassiterite SnO₂
Oxides & HydroxideTetragonalMohs 6–7
Catapleiite specimen
Catapleiite Na₂Zr(Si₃O₉)·2H₂O
SilicateMonoclinicMohs 6
Celsian specimen
Celsian Ba(Al₂Si₂O₈)
SilicateMonoclinicMohs 6–6.5
Charoite specimen
Charoite (K,Sr,Ba,Mn)₁₅₋₁₆(Ca,Na)₃₂[Si₇₀(O,OH)₁₈₀](OH,F)₄·nH₂O
SilicateMonoclinicMohs 5–6
Chegemite specimen
Chegemite Ca₇(SiO₄)₃(OH)₂
SilicateOrthorhombicMohs 5.5–6
Chestermanite specimen
Chestermanite Mg₂(Fe³⁺,Mg,Al,Sb⁵⁺)O₂(BO₃)
BorateOrthorhombicMohs 6
Chevkinite-(Ce) specimen
Chevkinite-(Ce) Ce₄(Ti,Fe²⁺,Fe³⁺)₅O₈(Si₂O₇)₂
SilicateMonoclinicMohs 5.5–6
Chiappinoite-(Y) specimen
Chiappinoite-(Y) Y₂Mn(Si₃O₇)₄
SilicateOrthorhombicMohs 6
Chibaite specimen
Chibaite SiO₂·n(CH₄,C₂H₆,C₃H₈,C₄H₁₀) (nmaₓ = 3/17)
Organic MineralCubicMohs 5.5–7
Chkalovite specimen
Chkalovite Na₂BeSi₂O₆
SilicateOrthorhombicMohs 6
Chondrodite specimen
Chondrodite Mg₅(SiO₄)₂F₂
SilicateMonoclinicMohs 6–6.5
Chromio-pargasite specimen
Chromio-pargasite NaCa₂(Mg₄Cr)(Si₆Al₂)O₂₂(OH)₂
SilicateMonoclinicMohs 6
Cleusonite specimen
Cleusonite Pb(U⁴⁺,U⁶⁺)Fe²⁺₂(Ti,Fe²⁺,Fe³⁺)₁₈(O,OH)₃₈
Oxides & HydroxideHexagonalMohs 6–7
C
Clinoenstatite Mg₂Si₂O₆
SilicateMonoclinicMohs 5–6
Clinoferrosilite specimen
Clinoferrosilite Fe²⁺₂Si₂O₆
SilicateMonoclinicMohs 5–6
Clinohumite specimen
Clinohumite Mg₉(SiO₄)₄F₂
SilicateMonoclinicMohs 6
Coffinite specimen
Coffinite U(SiO₄)·nH₂O
SilicateTetragonalMohs 5–6
C
Cohenite CFe₃
Organic MineralOrthorhombicMohs 5.5–6
GroupColumbite specimen
Columbite (Fe,Mn)Nb₂O₆
Oxides & HydroxideOrthorhombicMohs 6–6.5
Cristobalite specimen
Cristobalite SiO₂
SilicateTetragonalMohs 6–7
Cryptomelane specimen
Cryptomelane K(Mn⁴⁺₇Mn³⁺)O₁₆
Oxides & HydroxideTetragonalMohs 6–6.5
Cummingtonite specimen
Cummingtonite Mg₂Mg₅Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Cuspidine specimen
Cuspidine Ca₈(Si₂O₇)₂F₄
SilicateMonoclinicMohs 5–6
D
Dalnegorskite Ca₅Mn(Si₃O₉)₂
SilicateTriclinicMohs 6
Danalite specimen
Danalite Be₃Fe²⁺₄(SiO₄)₃S
SilicateCubicMohs 5.5–6
Davidite-(Ce) specimen
Davidite-(Ce) Ce(Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH,F)₃₈
HalideHexagonalMohs 6
Davidite-(La) specimen
Davidite-(La) La(Y,U)Fe₂(Ti,Fe,Cr,V)₁₈(O,OH,F)₃₈
HalideTrigonalMohs 6
D
Davyne [(Na,K)₆(SO₄)₀.₅Cl][Ca₂Cl₂][(Si₆Al₆O₂₄)]
SilicateHexagonalMohs 5.5–6
D
Delhuyarite-(Ce) Ce₄Mg(Fe³⁺₂W)   (Si₂O₇)₂O₆(OH)₂
SilicateMonoclinicMohs 5–6
D
Diegogattaite Na₂CaCu₂Si₈O₂₀·H₂O
SilicateMonoclinicMohs 5–6
Diopside specimen
Diopside CaMgSi₂O₆
SilicateMonoclinicMohs 5.5–6.5
D
Dmisteinbergite Ca(Al₂Si₂O₈)
SilicateHexagonalMohs 6
Donpeacorite specimen
Donpeacorite (Mn,Mg)MgSi₂O₆
SilicateOrthorhombicMohs 5–6
Drugmanite specimen
Drugmanite Pb₂Fe³⁺(PO₄)(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 6
Eckermannite specimen
Eckermannite NaNa₂(Mg₄Al)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Edenite specimen
Edenite NaCa₂Mg₅(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Eirikite specimen
Eirikite KNa₆Be₂(Si₁₅Al₃)O₃₉F₂
SilicateHexagonalMohs 6
Emeleusite specimen
Emeleusite Na₂LiFe³⁺Si₆O₁₅
SilicateOrthorhombicMohs 5–6
Enstatite specimen
Enstatite Mg₂Si₂O₆
SilicateOrthorhombicMohs 5–6
Epidote specimen
Epidote Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6–7
Ertixiite specimen
Ertixiite Na₂Si₄O₉
SilicateCubicMohs 5.8–6.5
Esseneite specimen
Esseneite CaFe³⁺AlSiO₆
SilicateMonoclinicMohs 6
Eudialyte specimen
Eudialyte Na₁₅Ca₆Fe₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
SilicateHexagonalMohs 5–6
Eudidymite specimen
Eudidymite Na₂Be₂Si₆O₁₅·H₂O
SilicateMonoclinicMohs 6
Euxenite-(Y) specimen
Euxenite-(Y) (Y,Ca,Ce,U,Th)(Nb,Ta,Ti)₂O₆
Oxides & HydroxideOrthorhombicMohs 5.5–6.5
F
Fabianite CaB₃O₅(OH)
Oxides & HydroxideMonoclinicMohs 6
F
Fergusonite-(Ce) CeNbO₄·0.3H₂O
Oxides & HydroxideTetragonalMohs 5.5–6.5
Fergusonite-(Y) specimen
Fergusonite-(Y) YNbO₄
Oxides & HydroxideTetragonalMohs 5.5–6.5
Ferriakasakaite-(Ce) specimen
Ferriakasakaite-(Ce) CaCeFe³⁺AlMn²⁺(Si₂O₇)(SiO₄)O(OH)
SilicateMonoclinicMohs 5.5–6
Ferriallanite-(Ce) specimen
Ferriallanite-(Ce) CaCe(Fe³⁺AlFe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6
F
Ferriallanite-(La) CaLa(Fe³⁺AlFe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6
F
Ferricoronadite Pb(Mn⁴⁺₆Fe³⁺₂)O₁₆
Oxides & HydroxideTetragonalMohs 6
F
Ferriperbøeite-(Ce) (CaCe₃)(Fe³⁺Al₂Fe²⁺)(Si₂O₇)(SiO₄)₃O(OH)₂
SilicateMonoclinicMohs 6–7
F
Ferriperbøeite-(La) (CaLa₃)(Fe³⁺Al₂Fe²⁺)[Si₂O₇][SiO₄]₃O(OH)₂
SilicateMonoclinicMohs 6
F
Ferro-actinolite Ca₂(Mg₂.₅₋₀.₀Fe²⁺₂.₅₋₅.₀)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Ferro-edenite specimen
Ferro-edenite NaCa₂Fe²⁺₅(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
F
Ferro-ferri-hornblende Ca₂(Fe²⁺₄Fe³⁺)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 6
F
Ferro-ferri-nybøite NaNa₂(Fe²⁺₃Fe³⁺₂)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 6
F
Ferro-fluoro-edenite NaCa₂Fe²⁺₅(Si₇AlO₂₂)F₂
SilicateMonoclinicMohs 5–6
Ferro-gedrite specimen
Ferro-gedrite Fe²⁺₂(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂
SilicateOrthorhombicMohs 5.5–6
Ferro-glaucophane specimen
Ferro-glaucophane Na₂(Fe²⁺₃Al₂)Si₈O₂₂(OH)₂
SilicateMohs 6
Ferro-hornblende specimen
Ferro-hornblende Ca₂(Fe²⁺₄Al)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Ferro-papikeite specimen
Ferro-papikeite NaFe²⁺₂(Fe²⁺₃Al₂)(Si₅Al₃)O₂₂(OH)₂
SilicateOrthorhombicMohs 6
F
Ferro-pargasite NaCa₂(Fe²⁺₄Al)(Si₆Al₂)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
F
Ferro-pedrizite NaLi₂(Fe²⁺₂Al₂Li)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 6
Ferro-richterite specimen
Ferro-richterite Na(NaCa)Fe²⁺₅Si₈O₂₂(OH)₂
SilicateMohs 5–6
F
Ferro-tschermakite Ca₂(Fe²⁺₃Al₂)(Si₆Al₂)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Ferrobustamite specimen
Ferrobustamite CaFe²⁺Si₂O₆
SilicateTriclinicMohs 6
Ferrokentbrooksite specimen
Ferrokentbrooksite Na₁₅Ca₆Fe²⁺₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(F,Cl)₂
SilicateHexagonalMohs 5–6
Ferrorhodonite specimen
Ferrorhodonite CaMn₃Fe(Si₅O₁₅)
SilicateTriclinicMohs 6
Ferroselite specimen
Ferroselite FeSe₂
SulfideOrthorhombicMohs 6–6.5
Ferrosilite specimen
Ferrosilite Fe²⁺₂Si₂O₆
SilicateOrthorhombicMohs 6
F
Filatovite K(Al,Zn)₂(As,Si)₂O₈
SilicateMonoclinicMohs 5–6
Florencite-(Ce) specimen
Florencite-(Ce) CeAl₃(PO₄)₂(OH)₆
PhosphateHexagonalMohs 5–6
F
Florencite-(Sm) SmAl₃(PO₄)₂(OH)₆
PhosphateHexagonalMohs 5.5–6
F
Fluorchegemite Ca₇(SiO₄)₃F₂
SilicateMohs 5.5–6
F
Fluormayenite Ca₁₂Al₁₄O₃₂[   ₄F₂]
HalideCubicMohs 5.5–6
F
Fluoro-pargasite NaCa₂(Mg₄Al)(Si₆Al₂)O₂₂F₂
SilicateMonoclinicMohs 6
F
Fluoro-tremolite Ca₂Mg₅Si₈O₂₂F₂
SilicateMonoclinicMohs 5–6
F
Fluorvesuvianite Ca₁₉(Al,Mg)₁₃(SiO₄)₁₀(Si₂O₇)₄O(F,OH)₉
SilicateTetragonalMohs 6
Folvikite specimen
Folvikite Sb⁵⁺Mn³⁺(Mg,Mn²⁺)₁₀O₈(BO₃)₄
BorateMonoclinicMohs 6
Foordite specimen
Foordite Sn²⁺Nb₂O₆
Oxides & HydroxideMonoclinicMohs 6
Formanite-(Y) specimen
Formanite-(Y) YTaO₄
Oxides & HydroxideMonoclinicMohs 5.5–6.5
Franklinite specimen
Franklinite ZnFe³⁺₂O₄
Oxides & HydroxideCubicMohs 5.5–6.5
F
Freboldite CoSe
SulfideHexagonalMohs 6
Fredrikssonite specimen
Fredrikssonite Mg₂Mn³⁺O₂(BO₃)
BorateOrthorhombicMohs 6
F
Friedrichbeckeite K(   Na)Mg₂(Be₂Mg)Si₁₂O₃₀
SilicateHexagonalMohs 6
Garrelsite specimen
Garrelsite NaBa₃B₇Si₂O₁₆(OH)₄
SilicateMonoclinicMohs 6
G
Gatelite-(Ce) (Ca,Ce)₄(Al,Mg,Fe)₄(Si₂O₇)(SiO₄)₃(O,F,OH)₃
SilicateMonoclinicMohs 6–7
Gaudefroyite specimen
Gaudefroyite Ca₄Mn³⁺₃(BO₃)₃(CO₃)O₃
BorateHexagonalMohs 6
Gedrite specimen
Gedrite Mg₂(Mg₃Al₂)(Si₆Al₂)O₂₂(OH)₂
SilicateOrthorhombicMohs 5.5–6
Gehlenite specimen
Gehlenite Ca₂Al(SiAl)O₇
SilicateTetragonalMohs 5–6
Geikielite specimen
Geikielite MgTiO₃
Oxides & HydroxideHexagonalMohs 5–6
Giuseppettite specimen
Giuseppettite Na₄₂K₁₆Ca₆Si₄₈Al₄₈O₁₉₂(SO₄)₁₀Cl₂·5H₂O
SilicateHexagonalMohs 6–7
Glaucochroite specimen
Glaucochroite CaMn²⁺(SiO₄)
SilicateOrthorhombicMohs 6
Glaucophane specimen
Glaucophane Na₂(Mg₃Al₂)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 6–6.5
Gorceixite specimen
Gorceixite BaAl₃(PO₄)(PO₃OH)(OH)₆
PhosphateHexagonalMohs 6
G
Grandaite Sr₂Al(AsO₄)₂(OH)
ArsenateMonoclinicMohs 6–6.5
Grunerite specimen
Grunerite Fe²⁺₂Fe²⁺₅Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Gudmundite specimen
Gudmundite FeSbS
SulfosaltMonoclinicMohs 5–6
Hancockite specimen
Hancockite CaPb(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinicMohs 6–7
Hastingsite specimen
Hastingsite NaCa₂(Fe²⁺₄Fe³⁺)(Si₆Al₂)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Haüyne specimen
Haüyne Na₃Ca(Si₃Al₃)O₁₂(SO₄)
SilicateCubicMohs 5.5–6
Hedenbergite specimen
Hedenbergite CaFe²⁺Si₂O₆
SilicateMonoclinicMohs 5.5–6.5
Hellandite-(Y) specimen
Hellandite-(Y) (Ca,REE)₄Y₂Al   ₂(B₄Si₄O₂₂)(OH)₂
SilicateMonoclinicMohs 4.5–6.5
Helvine specimen
Helvine Be₃Mn²⁺₄(SiO₄)₃S
SilicateCubicMohs 6–6.5
H
Henrymeyerite Ba(Ti₇Fe²⁺)O₁₆
Oxides & HydroxideTetragonalMohs 5–6
Hetaerolite specimen
Hetaerolite ZnMn³⁺₂O₄
Oxides & HydroxideTetragonalMohs 6
H
Hezuolinite (Sr,REE)₄Zr(Ti,Fe³⁺,Fe²⁺)₂Ti₂O₈(Si₂O₇)₂
SilicateMonoclinicMohs 5.5–6
Hillebrandite specimen
Hillebrandite Ca₂SiO₃(OH)₂
SilicateOrthorhombicMohs 5–6
Hingganite-(Ce) specimen
Hingganite-(Ce) BeCe(SiO₄)(OH)
SilicateMonoclinicMohs 5–6
H
Hingganite-(Nd) Nd₂   Be₂Si₂O₈(OH)₂
SilicateMonoclinicMohs 5.5–6
H
Hingganite-(Yb) BeYb(SiO₄)(OH)
SilicateMonoclinicMohs 6–7
Hollandite specimen
Hollandite Ba(Mn⁴⁺₆Mn³⁺₂)O₁₆
Oxides & HydroxideMonoclinicMohs 6
Hollingworthite specimen
Hollingworthite RhAsS
SulfosaltCubicMohs 6
Holmquistite specimen
Holmquistite Li₂(Mg₃Al₂)Si₈O₂₂(OH)₂
SilicateOrthorhombicMohs 5–6
H
Holtstamite Ca₃Al₂(SiO₄)₂(OH)₄
SilicateTetragonalMohs 6
GroupHornblende specimen
Hornblende Ca₂(Mg,Fe,Al)₅(Al,Si)₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
Humite specimen
Humite Mg₇(SiO₄)₃F₂
SilicateOrthorhombicMohs 6
H
Hundholmenite-(Y) (Y,REE,Ca,Na)₁₅(Al,Fe³⁺)CaₓAs³⁺₁₋ₓ(Si,As⁵⁺)Si₆B₃(O,F)₄₈
SilicateHexagonalMohs 5–6
Hurlbutite specimen
Hurlbutite CaBe₂(PO₄)₂
PhosphateMonoclinicMohs 6
Hydroxycalciomicrolite specimen
Hydroxycalciomicrolite Ca₁.₅Ta₂O₆(OH)
Oxides & HydroxideCubicMohs 5–6
H
Hydroxycalciopyrochlore (Ca,Na,U,   )₂(Nb,Ti)₂O₆(OH)
Oxides & HydroxideCubicMohs 5–6
Hydroxycancrinite specimen
Hydroxycancrinite (Na,Ca,K)₈(Al₆Si₆O₂₄)(OH,CO₃)₂·2H₂O
SilicateHexagonalMohs 6
H
Hydroxylchondrodite Mg₅(SiO₄)₂(OH)₂
SilicateMonoclinicMohs 6
Iimoriite-(Y) specimen
Iimoriite-(Y) Y₂(SiO₄)(CO₃)
SilicateTriclinicMohs 5.5–6
Ilmenite specimen
Ilmenite Fe²⁺Ti⁴⁺O₃
Oxides & HydroxideHexagonalMohs 5–6
Ilvaite specimen
Ilvaite CaFe³⁺Fe²⁺₂O(Si₂O₇)(OH)
SilicateMonoclinicMohs 5.5–6
Inesite specimen
Inesite Ca₂Mn²⁺₇Si₁₀O₂₈(OH)₂·5H₂O
SilicateTriclinicMohs 5.5–6
I
Innsbruckite Mn₃₃(Si₂O₅)₁₄(OH)₃₈
SilicateMonoclinicMohs 6
Iridium specimen
Iridium Ir
Native ElementCubicMohs 6–7
I
Ishikawaite (U,Fe,Y)NbO₄
Oxides & HydroxideMonoclinicMohs 5–6
I
Iwashiroite-(Y) YTaO₄
Oxides & HydroxideMonoclinicMohs 6
Jacobsite specimen
Jacobsite Mn²⁺Fe³⁺₂O₄
Oxides & HydroxideCubicMohs 5.5–6.5
J
Jarandolite CaB₃O₄(OH)₃
Oxides & HydroxideMonoclinicMohs 6
Jeppeite specimen
Jeppeite (K,Ba)₂(Ti,Fe³⁺)₆O₁₃
Oxides & HydroxideMonoclinicMohs 5–6
Johannsenite specimen
Johannsenite CaMnSi₂O₆
SilicateMonoclinicMohs 6
J
Johnsenite-(Ce) Na₁₂Ce₃Ca₆Mn₃Zr₃WSi₂₅O₇₃(CO₃)(OH)₂
SilicateHexagonalMohs 5–6
Kaersutite specimen
Kaersutite NaCa₂(Mg₃AlTi⁴⁺)(Si₆Al₂)O₂₂O₂
SilicateMonoclinicMohs 5–6
Kahlenbergite specimen
Kahlenbergite KAl₁₁O₁₇
Oxides & HydroxideHexagonalMohs 6–7
Kainosite-(Y) specimen
Kainosite-(Y) Ca₂Y₂(SiO₃)₄(CO₃)·H₂O
SilicateOrthorhombicMohs 5–6
Kalborsite specimen
Kalborsite K₆Al₄BSi₆O₂₀(OH)₄Cl
SilicateTetragonalMohs 6
Kaliophilite specimen
Kaliophilite KAlSiO₄
SilicateHexagonalMohs 6
Kalsilite specimen
Kalsilite KAlSiO₄
SilicateHexagonalMohs 6
K
Kannanite Ca₄Al₄(MgAl)(VO₄)(SiO₄)₂(Si₃O₁₀)(OH)₆
SilicateOrthorhombicMohs 6
Kanoite specimen
Kanoite MnMgSi₂O₆
SilicateMonoclinicMohs 6
K
Kapustinite Na₆ZrSi₆O₁₆(OH)₂
SilicateTrigonalMohs 6
Katophorite specimen
Katophorite Na(NaCa)(Mg₄Al)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
K
Kenoplumbomicrolite (Pb,   )₂Ta₂O₆[   ,(OH),O]
Oxides & HydroxideCubicMohs 6
Kentbrooksite specimen
Kentbrooksite (Na,REE)₁₅(Ca,REE)₆Mn₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(F,Cl)₂
SilicateHexagonalMohs 5–6
Kentrolite specimen
Kentrolite Pb₂Mn³⁺₂O₂(Si₂O₇)
SilicateOrthorhombicMohs 6
Kesebolite-(Ce) specimen
Kesebolite-(Ce) CeCa₂Mn(AsO₄)(SiO₃)₃
SilicateMonoclinicMohs 5–6
Khesinite specimen
Khesinite Ca₄(Mg₂Fe³⁺₁₀)O₄(Fe³⁺₁₀Si₂)O₃₆
SilicateTriclinicMohs 6
Khomyakovite specimen
Khomyakovite Na₁₂Sr₃Ca₆Fe₃Zr₃W(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
SilicateHexagonalMohs 5–6
K
Kingstonite Rh₃S₄
SulfideMonoclinicMohs 6
K
Kirchhoffite CsBSi₂O₆
SilicateTetragonalMohs 6–6.5
K
Koashvite Na₆CaTiSi₆O₁₈
SilicateOrthorhombicMohs 6
Kosmochlor specimen
Kosmochlor NaCr³⁺Si₂O₆
SilicateMonoclinicMohs 6

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