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Monoclinic minerals

One oblique angle between axes.

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1,952 minerals · Monoclinic minerals
Azurite specimen
Azurite Cu₃(CO₃)₂(OH)₂
CarbonateMonoclinicMohs 3.5–4
GroupBiotite specimen
Biotite K(Mg,Fe)₃(AlSi₃O₁₀)(OH)₂
SilicateMonoclinicMohs 2.5–3
Gypsum specimen
Gypsum Ca(SO₄)·2H₂O
SulfateMonoclinicMohs 2
Jade specimen
Jade Jadeite or nephrite
SilicateMonoclinicMohs 6–7
Jadeite specimen
Jadeite NaAlSi₂O₆
SilicateMonoclinicMohs 6–7
GroupLepidolite specimen
Lepidolite K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂
SilicateMonoclinicMohs 2.5–3
Malachite specimen
Malachite Cu₂(CO₃)(OH)₂
CarbonateMonoclinicMohs 3.5–4
VarietyMoonstone specimen
Moonstone KAlSi₃O₈
SilicateMonoclinicMohs 6–6.5
Muscovite specimen
Muscovite KAl₂(Si₃Al)O₁₀(OH)₂
SilicateMonoclinicMohs 2–2.5
VarietySelenite specimen
Selenite CaSO₄·2H₂O
SulfateMonoclinicMohs 2
Spodumene specimen
Spodumene LiAlSi₂O₆
SilicateMonoclinicMohs 6.5–7
Acanthite specimen
Acanthite Ag₂S
SulfideMonoclinicMohs 2–2.5
A
Achalaite Fe²⁺TiNb₂O₈
Oxides & HydroxideMonoclinicMohs 5.5
Actinolite specimen
Actinolite Ca₂(Mg₄.₅₋₂.₅Fe²⁺₀.₅₋₂.₅)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
A
Acuminite SrAlF₄(OH)·H₂O
HalideMonoclinicMohs 3.5
A
Adanite Pb₂(Te⁴⁺O₃)(SO₄)
SulfateMonoclinicMohs 2.5
Admontite specimen
Admontite MgB₆O₁₀·7H₂O
BorateMonoclinicMohs 2–3
A
Adolfpateraite K(UO₂)(SO₄)(OH)(H₂O)
SulfateMonoclinicMohs 2
Aegirine specimen
Aegirine NaFe³⁺Si₂O₆
SilicateMonoclinicMohs 6–6.5
Aegirine-augite specimen
Aegirine-augite (Ca,Na)(Fe³⁺,Mg,Fe²⁺)Si₂O₆
SilicateMonoclinic
Afwillite specimen
Afwillite Ca₃[SiO₄][SiO₂(OH)₂]·2H₂O
SilicateMonoclinicMohs 3–4
Agricolaite specimen
Agricolaite K₄(UO₂)(CO₃)₃
CarbonateMonoclinicMohs 4
Aguilarite specimen
Aguilarite Ag₄SeS
SulfideMonoclinicMohs 2.5
Ahlfeldite specimen
Ahlfeldite Ni(SeO₃)·2H₂O
Oxides & HydroxideMonoclinicMohs 2–2.5
A
Airdite Sr(V⁴⁺O)₂(PO₄)₂·4H₂O
PhosphateMonoclinic
Akaganeite specimen
Akaganeite (Fe³⁺,Ni²⁺)₈(OH,O)₁₆Cl₁.₂₅·nH₂O
HalideMonoclinic
A
Akaogiite TiO₂
Oxides & HydroxideMonoclinic
A
Aklimaite Ca₄[Si₂O₅(OH)₂](OH)₄·5H₂O
SilicateMonoclinicMohs 3–4
A
Akopovaite Al₄Li₂(OH)₁₂(CO₃)(H₂O)₃
CarbonateMonoclinicMohs 1
Akrochordite specimen
Akrochordite Mn²⁺₅(AsO₄)₂(OH)₄·4H₂O
ArsenateMonoclinicMohs 3.5
A
Alacránite As₈S₉
SulfideMonoclinicMohs 1.5
Alamosite specimen
Alamosite PbSiO₃
SilicateMonoclinicMohs 4.5
A
Albertiniite Fe²⁺(SO₃)·3H₂O
SulfateMonoclinic
A
Alcaparrosaite K₃Ti⁴⁺Fe³⁺(SO₄)₄O(H₂O)₂
SulfateMonoclinicMohs 4
Aldomarinoite specimen
Aldomarinoite Sr₂Mn³⁺(AsO₄)₂(OH)
ArsenateMonoclinic
Aldridgeite specimen
Aldridgeite (Cd,Ca)(Cu,Zn)₄(SO₄)₂(OH)₆·3H₂O
SulfateMonoclinicMohs 3
A
Aleksandrovite KCa₇Sn₂Li₃Si₁₂O₃₆F₂
SilicateMonoclinicMohs 4–4.5
A
Aleutite [Cu₅O₂](AsO₄)(VO₄)·(Cu₀.₅   ₀.₅)Cl
ArsenateMonoclinic
A
Alexkuznetsovite-(Ce) Ce₂Mn(CO₃)(Si₂O₇)
SilicateMonoclinicMohs 5
A
Alexkuznetsovite-(La) La₂Mn(CO₃)(Si₂O₇)
SilicateMonoclinicMohs 5
A
Alflarsenite NaCa₂Be₃Si₄O₁₃(OH)·2H₂O
SilicateMonoclinicMohs 4
Allactite specimen
Allactite Mn²⁺₇(AsO₄)₂(OH)₈
ArsenateMonoclinicMohs 4.5
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
Allanite-(Y) specimen
Allanite-(Y) CaY(Al₂Fe²⁺)[Si₂O₇][SiO₄]O(OH)
SilicateMonoclinic
Allanpringite specimen
Allanpringite Fe³⁺₃(PO₄)₂(OH)₃·5H₂O
PhosphateMonoclinicMohs 3
Alleghanyite specimen
Alleghanyite Mn²⁺₅(SiO₄)₂(OH)₂
SilicateMonoclinicMohs 5.5
A
Allochalcoselite Cu¹⁺Cu²⁺₅PbO₂(SeO₃)₂Cl₅
HalideMonoclinicMohs 3–4
Alloclasite specimen
Alloclasite CoAsS
SulfosaltMonoclinicMohs 5
Alluaudite specimen
Alluaudite NaMnFe³⁺₂(PO₄)₃
PhosphateMonoclinicMohs 5–5.5
A
Alnaperbøeite-(Ce) (CaCe₂.₅Na₀.₅)(Al₄)(Si₂O₇)(SiO₄)₃O(OH)₂
SilicateMonoclinicMohs 6–7
Alpersite specimen
Alpersite Mg(SO₄)·7H₂O
SulfateMonoclinicMohs 2.5
A
Alsakharovite-Zn NaSrKZn(Ti,Nb)₄(Si₄O₁₂)₂(O,OH)₄·7H₂O
SilicateMonoclinicMohs 5
Alterite specimen
Alterite Zn₂Fe³⁺₄(SO₄)₄(C₂O₄)₂(OH)₄·17H₂O
Organic MineralMonoclinic
A
Altisite Na₃K₆Ti₂Al₂Si₈O₂₆Cl₃
SilicateMonoclinic
Aluminite specimen
Aluminite Al₂(SO₄)(OH)₄·7H₂O
SulfateMonoclinicMohs 1–2
Aluminoceladonite specimen
Aluminoceladonite K(Mg,Fe²⁺)Al(Si₄O₁₀)(OH)₂
SilicateMonoclinic
A
Aluminomagnesiohulsite Mg₂AlO₂(BO₃)
BorateMonoclinic
A
Alumoklyuchevskite K₃Cu²⁺₃AlO₂(SO₄)₄
SulfateMonoclinicMohs 2.3
Alvanite specimen
Alvanite Zn²⁺Al₄(V⁵⁺O₃)₂(OH)₁₂·2H₂O
Oxides & HydroxideMonoclinicMohs 3–3.5
A
Amamoorite CaMn²⁺₂Mn³⁺(Si₂O₇)O(OH)
SilicateMonoclinicMohs 6
A
Amarillite NaFe³⁺(SO₄)₂·6H₂O
SulfateMonoclinicMohs 2.5–3
Ameghinite specimen
Ameghinite NaB₃O₃(OH)₄
Oxides & HydroxideMonoclinicMohs 2.5
Amicite specimen
Amicite K₂Na₂(Al₄Si₄O₁₆)·5H₂O
SilicateMonoclinicMohs 4.5
A
Ammonioborite (NH₄)₃B₁₅O₂₀(OH)₈·4H₂O
Oxides & HydroxideMonoclinic
A
Ammoniolasalite [(NH₄)₂Mg₂(H₂O)₂₀]·[V₁₀O₂₈]
Oxides & HydroxideMonoclinicMohs 1
A
Ammoniotinsleyite (NH₄)Al₂(PO₄)₂(OH)·2H₂O
PhosphateMonoclinicMohs 4
GroupAmphibole specimen
Amphibole A₀₋₁B₂C₅T₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6.5
Amstallite specimen
Amstallite CaAl[(Al,Si)₄O₈(OH)₂](OH)₂·(H₂O,Cl)
SilicateMonoclinicMohs 3–5
A
Anandite BaFe²⁺₃(Si₃Fe³⁺)O₁₀S(OH)
SilicateMonoclinicMohs 3–4
A
Andorite IV AgPbSb₃S₆
SulfosaltMonoclinic
A
Andreadiniite CuHgAg₇Pb₇Sb₂₄S₄₈
SulfosaltMonoclinicMohs 3.5
Andrémeyerite specimen
Andrémeyerite BaFe²⁺₂(Si₂O₇)
SilicateMonoclinicMohs 5.5
Andyrobertsite specimen
Andyrobertsite KCdCu₅(AsO₄)₄[As(OH)₂O₂]·2H₂O
ArsenateMonoclinicMohs 3
Ankinovichite specimen
Ankinovichite NiAl₄(V⁵⁺O₃)₂(OH)₁₂·2H₂O
Oxides & HydroxideMonoclinicMohs 2.5–3
Annabergite specimen
Annabergite Ni₃(AsO₄)₂·8H₂O
ArsenateMonoclinicMohs 1.5–2.5
Annite specimen
Annite KFe²⁺₃(AlSi₃O₁₀)(OH)₂
SilicateMonoclinicMohs 2.5–3
Ansermetite specimen
Ansermetite Mn²⁺V⁵⁺₂O₆·4H₂O
Oxides & HydroxideMonoclinic
Antigorite specimen
Antigorite Mg₃Si₂O₅(OH)₄
SilicateMonoclinicMohs 2.5–3.5
Antofagastaite specimen
Antofagastaite Na₂Ca(SO₄)₂·1.5H₂O
SulfateMonoclinicMohs 3
A
Anzaite-(Ce) Ce₄Fe²⁺Ti₆O₁₈(OH)₂
Oxides & HydroxideMonoclinic
A
Apachite Cu²⁺₉Si₁₀O₂₉·11H₂O
SilicateMonoclinicMohs 2
Apjohnite specimen
Apjohnite Mn²⁺Al₂(SO₄)₄·22H₂O
SulfateMonoclinicMohs 1.5
Aplowite specimen
Aplowite Co(SO₄)·4H₂O
SulfateMonoclinicMohs 3
A
Arakiite ZnMn²⁺₁₂Fe³⁺₂(As³⁺O₃)(As⁵⁺O₄)₂(OH)₂₃
Oxides & HydroxideMonoclinicMohs 3–4
A
Arangasite Al₂(SO₄)(PO₄)F·9H₂O
PhosphateMonoclinicMohs 1–2
Ardaite specimen
Ardaite Pb₁₇Sb₁₅S₃₅Cl₉
SulfosaltMonoclinic
A
Ardealite Ca₂(PO₃OH)(SO₄)·4H₂O
PhosphateMonoclinic
Arfvedsonite specimen
Arfvedsonite NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
A
Argandite Mn₇(VO₄)₂(OH)₈
VanadateMonoclinicMohs 3.5–4
Argentobaumhauerite specimen
Argentobaumhauerite Ag₁.₅Pb₂₂As₃₃.₅S₇₂
SulfosaltMonoclinic
Argentopyrite specimen
Argentopyrite AgFe₂S₃
SulfideMonoclinicMohs 3.5–4
Aristarainite specimen
Aristarainite Na₂Mg[B₆O₈(OH)₄]₂·4H₂O
BorateMonoclinicMohs 3.5
A
Armbrusterite Na₆K₅Mn³⁺Mn²⁺₁₄(Si₉O₂₂)₄(OH)₁₀·4H₂O
SilicateMonoclinic
Armstrongite specimen
Armstrongite CaZr(Si₆O₁₅)·2H₂O
SilicateMonoclinicMohs 4.6
A
Arrojadite-(BaNa) BaNa₃(NaCa)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 4–5
A
Arrojadite-(KFe) (KNa)Fe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 5
A
Arrojadite-(KNa) KNa₃(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 5
A
Arrojadite-(PbFe) PbFe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 3.5–4
A
Arrojadite-(SrFe) SrFe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
PhosphateMonoclinicMohs 3.5–4
A
Arsenatrotitanite NaTi(AsO₄)O
ArsenateMonoclinicMohs 5.5
A
Arsenbrackebuschite Pb₂(Fe³⁺,Zn)(AsO₄)₂(OH,H₂O)
ArsenateMonoclinicMohs 4–5
Arseniopleite specimen
Arseniopleite NaCaMnMn₂(AsO₄)₃
ArsenateMonoclinicMohs 3–4
Arseniosiderite specimen
Arseniosiderite Ca₂Fe³⁺₃O₂(AsO₄)₃·3H₂O
ArsenateMonoclinicMohs 4.5
Arsenmedaite specimen
Arsenmedaite Mn²⁺₆As⁵⁺Si₅O₁₈(OH)
SilicateMonoclinic
Arsenopyrite specimen
Arsenopyrite FeAsS
SulfosaltMonoclinicMohs 5.5–6
A
Arsenoveszelyite Cu₂Zn(AsO₄)(OH)₃·2H₂O
ArsenateMonoclinic
A
Arsenowagnerite Mg₂(AsO₄)F
ArsenateMonoclinicMohs 5
A
Arsenquatrandorite Ag₁₇.₆Pb₁₂.₈Sb₃₈.₁As₁₁.₅S₉₆
SulfosaltMonoclinic
Arsentsumebite specimen
Arsentsumebite Pb₂Cu(AsO₄)(SO₄)(OH)
ArsenateMonoclinicMohs 3.5
A
Arsmirandite Na₁₈Cu₁₂Fe³⁺O₈(AsO₄)₈Cl₅
ArsenateMonoclinic
Arthurite specimen
Arthurite CuFe³⁺₂(AsO₄)₂(OH)₂·4H₂O
ArsenateMonoclinicMohs 3.5
Artinite specimen
Artinite Mg₂(CO₃)(OH)₂·3H₂O
CarbonateMonoclinicMohs 2.5
A
Artsmithite Hg¹⁺₄Al(PO₄)₁.₇₄(OH)₁.₇₈
PhosphateMonoclinic
Arupite specimen
Arupite Ni₃(PO₄)₂·8H₂O
PhosphateMonoclinic
Aschamalmite specimen
Aschamalmite Pb₆₋₃ₓBi₂₊ₓS₉
SulfosaltMonoclinic
Atelestite specimen
Atelestite Bi₂O(AsO₄)(OH)
ArsenateMonoclinicMohs 4.5–5
A
Attakolite CaMn²⁺Al₄(HSiO₄)(PO₄)₃(OH)₄
SilicateMonoclinicMohs 5
Augelite specimen
Augelite Al₂(PO₄)(OH)₃
PhosphateMonoclinicMohs 4.5–5
Augite specimen
Augite (Ca,Mg,Fe)₂Si₂O₆
SilicateMonoclinicMohs 5.5–6
Aurichalcite specimen
Aurichalcite (Zn,Cu)₅(CO₃)₂(OH)₆
CarbonateMonoclinicMohs 1–2
A
Aurivilliusite Hg¹⁺Hg²⁺OI
HalideMonoclinic
Avdoninite specimen
Avdoninite K₂Cu₅Cl₈(OH)₄·2H₂O
HalideMonoclinicMohs 3
Babánekite specimen
Babánekite Cu₃(AsO₄)₂·8H₂O
ArsenateMonoclinic
B
Badalovite NaNaMg(MgFe³⁺)(AsO₄)₃
ArsenateMonoclinicMohs 3.5
Baddeleyite specimen
Baddeleyite ZrO₂
Oxides & HydroxideMonoclinicMohs 6.5
Bafertisite specimen
Bafertisite Ba₂Fe²⁺₄Ti₂(Si₂O₇)₂O₂(OH)₂F₂
SilicateMonoclinicMohs 5
Baghdadite specimen
Baghdadite Ca₆Zr₂(Si₂O₇)₂O₄
SilicateMonoclinicMohs 6
Bahianite specimen
Bahianite Al₅Sb⁵⁺₃O₁₄(OH)₂
Oxides & HydroxideMonoclinicMohs 9
B
Baileychlore (Zn,Fe²⁺,Al,Mg)₆(Si,Al)₄O₁₀(OH)₈
SilicateMonoclinicMohs 5
B
Bairdite Pb₂Cu²⁺₄Te⁶⁺₂O₁₀(OH)₂(SO₄)·H₂O
SulfateMonoclinicMohs 2–3
Bakhchisaraitsevite specimen
Bakhchisaraitsevite Na₂Mg₅(PO₄)₄·7H₂O
PhosphateMonoclinicMohs 2–2.5
Balangeroite specimen
Balangeroite Mg₂₁Si₈O₂₇(OH)₂₀
SilicateMonoclinic
B
Balestraite KLi₂V⁵⁺Si₄O₁₂
SilicateMonoclinicMohs 2.5–3
Bannermanite specimen
Bannermanite (Na,K)ₓV⁴⁺ₓV⁵⁺₆₋ₓO₁₅ (0.5<x<0.9)
Oxides & HydroxideMonoclinic
Bannisterite specimen
Bannisterite (Ca,K,Na)(Mn²⁺,Fe²⁺)₁₀(Si,Al)₁₆O₃₈(OH)₈·nH₂O
SilicateMonoclinicMohs 4
Barahonaite-(Al) specimen
Barahonaite-(Al) (Ca,Cu,Na,Fe³⁺,Al)₁₂Al₂(AsO₄)₈(OH,Cl)ₓ·nH₂O
ArsenateMonoclinicMohs 2–3
Barahonaite-(Fe) specimen
Barahonaite-(Fe) (Ca,Cu,Na,Fe³⁺,Al)₁₂Fe³⁺₂(AsO₄)₈(OH,Cl)ₓ·nH₂O
ArsenateMonoclinicMohs 2–3
Baratovite specimen
Baratovite KLi₃Ca₇Ti₂(SiO₃)₁₂F₂
SilicateMonoclinicMohs 3.5–4
Barbosalite specimen
Barbosalite Fe²⁺Fe³⁺₂(PO₄)₂(OH)₂
PhosphateMonoclinicMohs 6
Bariandite specimen
Bariandite Al₀.₆(V⁵⁺,V⁴⁺)₈O₂₀·9H₂O
Oxides & HydroxideMonoclinic
B
Barikaite Ag₃Pb₁₀(Sb₈As₁₁)Σ₁₉S₄₀
SulfosaltMonoclinicMohs 3
B
Bariosincosite Ba(VO)₂(PO₄)₂·4H₂O
PhosphateMonoclinicMohs 3
B
Barićite (Mg,Fe)₃(PO₄)₂·8H₂O
PhosphateMonoclinic
Barnesite specimen
Barnesite Na₂V⁵⁺₆O₁₆·3H₂O
Oxides & HydroxideMonoclinicMohs 3
B
Barroisite (NaCa)(Mg₃Al₂)(Si₇Al)O₂₂(OH)₂
SilicateMonoclinicMohs 5–6
B
Barrydawsonite-(Y) Na₁.₅Y₀.₅CaSi₃O₉H
SilicateMonoclinic
Barstowite specimen
Barstowite Pb₄(CO₃)Cl₆·H₂O
CarbonateMonoclinicMohs 3
B
Bartelkeite PbFe²⁺Ge(Ge₂O₇)(OH)₂·H₂O
Oxides & HydroxideMonoclinicMohs 4
Barytocalcite specimen
Barytocalcite BaCa(CO₃)₂
CarbonateMonoclinicMohs 3.5–4
B
Barytolamprophyllite (BaK)Ti₂Na₃Ti(Si₂O₇)₂O₂(OH)₂
SilicateMonoclinicMohs 2–3
Bassanite specimen
Bassanite Ca(SO₄)·0.5H₂O
SulfateMonoclinic
Bassetite specimen
Bassetite Fe²⁺(UO₂)₂(PO₄)₂(H₂O)₁₀
PhosphateMonoclinicMohs 2.5
B
Bassoite SrV⁴⁺₃O₇·4H₂O
Oxides & HydroxideMonoclinicMohs 4–4.5
B
Batagayite CaZn₂(Zn,Cu)₆(PO₄)₄[PO₃(OH)]₃·12H₂O
PhosphateMonoclinicMohs 3
B
Baumoite Ba₀.₅[(UO₂)₃O₈Mo₂(OH)₃](H₂O)₃
Oxides & HydroxideMonoclinicMohs 2.5
B
Bayerite Al(OH)₃
Oxides & HydroxideMonoclinic
Bayldonite specimen
Bayldonite Cu₃PbO(AsO₃OH)₂(OH)₂
ArsenateMonoclinicMohs 4.5
Bayleyite specimen
Bayleyite Mg₂(UO₂)(CO₃)₃·18H₂O
CarbonateMonoclinicMohs 2–2.5
B
Baylissite K₂Mg(CO₃)₂·4H₂O
CarbonateMonoclinicMohs 2–3
Bazhenovite specimen
Bazhenovite Ca₈S₅(S₂O₃)(OH)₁₂·20H₂O
SulfateMonoclinicMohs 2
Bearsite specimen
Bearsite Be₂(AsO₄)(OH)·4H₂O
ArsenateMonoclinic
B
Bearthite Ca₂Al(PO₄)₂(OH)
PhosphateMonoclinicMohs 5
B
Beershevaite CaFe³⁺₃(PO₄)₃O
PhosphateMonoclinic
B
Belloite Cu(OH)Cl
HalideMonoclinic
B
Belousovite KZn(SO₄)Cl
SulfateMonoclinic
Bementite specimen
Bementite Mn₇Si₆O₁₅(OH)₈
SilicateMonoclinicMohs 4.5–6
Benavidesite specimen
Benavidesite Pb₄MnSb₆S₁₄
SulfosaltMonoclinic
Bendadaite specimen
Bendadaite Fe²⁺Fe³⁺₂(AsO₄)₂(OH)₂·4H₂O
ArsenateMonoclinicMohs 3
B
Benjaminite Ag₃Bi₇S₁₂
SulfosaltMonoclinicMohs 3.3–3.5
Beraunite specimen
Beraunite Fe³⁺₆(PO₄)₄O(OH)₄·6H₂O
PhosphateMonoclinicMohs 3–4
Berdesinskiite specimen
Berdesinskiite V³⁺₂TiO₅
Oxides & HydroxideMonoclinicMohs 6–6.5
Bergenite specimen
Bergenite Ca₂Ba₄(UO₂)₉O₆(PO₄)₆·16H₂O
PhosphateMonoclinicMohs 2.5
Bergslagite specimen
Bergslagite CaBe(AsO₄)(OH)
ArsenateMonoclinicMohs 5
Bermanite specimen
Bermanite Mn²⁺Mn³⁺₂(PO₄)₂(OH)₂·4H₂O
PhosphateMonoclinicMohs 3.5
Bernardevansite specimen
Bernardevansite Al₂(Se⁴⁺O₃)₃·6H₂O
Oxides & HydroxideMonoclinic
B
Bernardite TlAs₅S₈
SulfosaltMonoclinicMohs 2
Berryite specimen
Berryite Cu₃Ag₂Pb₃Bi₇S₁₆
SulfosaltMonoclinic
Beryllonite specimen
Beryllonite NaBe(PO₄)
PhosphateMonoclinicMohs 5.5–6
B
Beshtauite (NH₄)₂(UO₂)(SO₄)₂·2H₂O
SulfateMonoclinicMohs 2
Betpakdalite-CaCa specimen
Betpakdalite-CaCa [Ca₂(H₂O)₁₇Ca(H₂O)₆][Mo⁶⁺₈As⁵⁺₂Fe³⁺₃O₃₆(OH)]
Oxides & HydroxideMonoclinicMohs 3
B
Betpakdalite-CaMg [Ca₂(H₂O)₁₇Mg(H₂O)₆][Mo⁶⁺₈As⁵⁺₂Fe³⁺₃O₃₆(OH)]
Oxides & HydroxideMonoclinicMohs 3.5
B
Betpakdalite-FeFe [Fe³⁺₂(H₂O)₁₅(OH)₂Fe³⁺(H₂O)₆][Mo₈As₂Fe³⁺₃O₃₇]
Oxides & HydroxideMonoclinic
Betpakdalite-NaCa specimen
Betpakdalite-NaCa [Na₂(H₂O)₁₇Ca(H₂O)₆][Mo⁶⁺₈As⁵⁺₂Fe³⁺₃O₃₄(OH)₃]
Oxides & HydroxideMonoclinic
B
Betpakdalite-NaNa [Na₂(H₂O)₁₆Na(H₂O)₆][Mo⁶⁺₈As⁵⁺₂Fe³⁺₃O₃₃(OH)₄]
Oxides & HydroxideMonoclinicMohs 3
B
Bettertonite Al₆(AsO₄)₃(OH)₉(H₂O)₅·11H₂O
ArsenateMonoclinic
Beusite specimen
Beusite Mn²⁺Mn²⁺₂(PO₄)₂
PhosphateMonoclinicMohs 5
B
Beusite-(Ca) CaMn²⁺₂(PO₄)₂
PhosphateMonoclinicMohs 5
Biagioniite specimen
Biagioniite Tl₂SbS₂
SulfosaltMonoclinicMohs 3
B
Bianchite Zn(SO₄)·6H₂O
SulfateMonoclinicMohs 2.5
Bieberite specimen
Bieberite Co(SO₄)·7H₂O
SulfateMonoclinicMohs 2
Biehlite specimen
Biehlite Sb³⁺₂MoO₆
MolybdateMonoclinic
B
Bijvoetite-(Y) Y₈(UO₂)₁₆O₈(CO₃)₁₆(OH)₈·39H₂O
CarbonateMonoclinicMohs 2
B
Billwiseite Sb³⁺₅Nb₃WO₁₈
TungstateMonoclinicMohs 5
Bimbowrieite specimen
Bimbowrieite NaMgFe³⁺₅(PO₄)₄(OH)₆·2H₂O
PhosphateMonoclinic
B
Biraite-(Ce) Ce₂Fe²⁺(Si₂O₇)(CO₃)
SilicateMonoclinicMohs 5
B
Biraite-(La) La₂Fe²⁺(CO₃)(Si₂O₇)
SilicateMonoclinicMohs 5
Biringuccite specimen
Biringuccite Na₂B₅O₈(OH)·H₂O
BorateMonoclinic
Bischofite specimen
Bischofite MgCl₂·6H₂O
HalideMonoclinicMohs 1–2
Bismite specimen
Bismite Bi₂O₃
Oxides & HydroxideMonoclinicMohs 4.5
Bismutoferrite specimen
Bismutoferrite Fe³⁺₂Bi(SiO₄)₂(OH)
SilicateMonoclinic
B
Bityite CaLiAl₂(Si₂BeAl)O₁₀(OH)₂
SilicateMonoclinicMohs 4–4.5
Bjarebyite specimen
Bjarebyite BaMn²⁺₂Al₂(PO₄)₃(OH)₃
PhosphateMonoclinicMohs 4
B
Bleasdaleite Ca₂Cu₅(Bi,Cu)(PO₄)₄(H₂O,OH,Cl)₁₃
PhosphateMonoclinicMohs 2
Bluelizardite specimen
Bluelizardite Na₇(UO₂)(SO₄)₄Cl(H₂O)₂
SulfateMonoclinicMohs 2
B
Bluestreakite K₄Mg₂(V⁴⁺₂V⁵⁺₈O₂₈)·14H₂O
Oxides & HydroxideMonoclinicMohs 2
Blödite specimen
Blödite Na₂Mg(SO₄)₂·4H₂O
SulfateMonoclinicMohs 2.5–3
Bobfergusonite specimen
Bobfergusonite Na₂Mn²⁺₅Fe³⁺Al(PO₄)₆
PhosphateMonoclinicMohs 4
Bobierrite specimen
Bobierrite Mg₃(PO₄)₂·8H₂O
PhosphateMonoclinicMohs 2–2.5
B
Bobjonesite V⁴⁺O(SO₄)·3H₂O
VanadateMonoclinicMohs 1
Bobkingite specimen
Bobkingite Cu₅Cl₂(OH)₈·2H₂O
HalideMonoclinicMohs 3
B
Bodieite Bi³⁺₂(Te⁴⁺O₃)₂(SO₄)
SulfateMonoclinicMohs 2
Bokite specimen
Bokite (Al,Fe)₁.₃(V⁵⁺,V⁴⁺,Fe³⁺)₈O₂₀·7.5H₂O
Oxides & HydroxideMonoclinicMohs 3
Boltwoodite specimen
Boltwoodite (K,Na)(UO₂)(SiO₃OH)·1.5H₂O
SilicateMonoclinicMohs 3.5–4
Bonacinaite specimen
Bonacinaite Sc(AsO₄)·2H₂O
ArsenateMonoclinic
Bonattite specimen
Bonattite Cu(SO₄)·3H₂O
SulfateMonoclinic
Bonazziite specimen
Bonazziite As₄S₄
SulfideMonoclinicMohs 2.5
B
Bonshtedtite Na₃Fe²⁺(PO₄)(CO₃)
PhosphateMonoclinicMohs 4
Boothite specimen
Boothite Cu(SO₄)·7H₂O
SulfateMonoclinicMohs 2–2.5
B
Boralsilite Al₁₆B₆O₃₀(Si₂O₇)
SilicateMonoclinic
Borax specimen
Borax Na₂B₄O₅(OH)₄·8H₂O
BorateMonoclinicMohs 2–2.5
Borcarite specimen
Borcarite Ca₄MgB₄O₆(CO₃)₂(OH)₆
BorateMonoclinicMohs 4–4.5
B
Borisenkoite Cu₃[(V,As)O₄]₂
Oxides & HydroxideMonoclinicMohs 4.5
Bornemanite specimen
Bornemanite Na₆(Na   )Ba₂Ti₂Nb₂(Si₂O₇)₄(PO₄)₂O₄(OH)₂F₂
SilicateMonoclinicMohs 3.5–4
Borocookeite specimen
Borocookeite LiAl₄(Si₃B)O₁₀(OH)₈
SilicateMonoclinicMohs 3
B
Borodaevite Ag₄.₈₃Fe₀.₂₁Pb₀.₄₅(Bi,Sb)₈.₈₄S₁₆
SulfosaltMonoclinic
Boromuscovite specimen
Boromuscovite KAl₂(Si₃B)O₁₀(OH)₂
SilicateMonoclinicMohs 2.5–3
Botallackite specimen
Botallackite Cu₂Cl(OH)₃
HalideMonoclinic
Botryogen specimen
Botryogen MgFe³⁺(SO₄)₂(OH)·7H₂O
SulfateMonoclinicMohs 2–2.5
B
Bouazzerite Bi₆(Mg,Co)₁₁Fe₁₄(AsO₄)₁₈O₁₂(OH)₄·86H₂O
ArsenateMonoclinic
B
Bounahasite Cu¹⁺Cu²⁺₂(OH)₃Cl₂
HalideMonoclinic
Boussingaultite specimen
Boussingaultite (NH₄)₂Mg(SO₄)₂·6H₂O
SulfateMonoclinicMohs 2
Boyleite specimen
Boyleite Zn(SO₄)·4H₂O
SulfateMonoclinicMohs 2
Brackebuschite specimen
Brackebuschite Pb₂Mn³⁺(VO₄)₂(OH)
VanadateMonoclinic
B
Bradaczekite NaCuCuCu₂(AsO₄)₃
ArsenateMonoclinic
Bradleyite specimen
Bradleyite Na₃Mg(PO₄)(CO₃)
PhosphateMonoclinic
Brandtite specimen
Brandtite Ca₂Mn²⁺(AsO₄)₂·2H₂O
ArsenateMonoclinicMohs 3.5
Brannerite specimen
Brannerite UTi₂O₆
Oxides & HydroxideMonoclinic

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