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Gemstones
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115
minerals · Gems & Birthstones · sorted with popular first
Variety
Agate
SiO₂
Silicate
Trigonal
Mohs 6.5–7
Almandine
Fe²⁺₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 7–7.5
Mineraloid
Amber
C₁₀H₁₆O (fossil resin)
Organic Mineral
Amorphous
Mohs 2–2.5
Variety
Amethyst
SiO₂
Silicate
Trigonal
Mohs 7
Group
Apatite
Ca₅(PO₄)₃(F,Cl,OH)
Phosphate
Hexagonal
Mohs 5
Variety
Aquamarine
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Beryl
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Variety
Citrine
SiO₂
Silicate
Trigonal
Mohs 7
Diamond
C
Native Element
Cubic
Mohs 10
Variety
Emerald
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Fluorapatite
Ca₅(PO₄)₃F
Phosphate
Hexagonal
Mohs 5
Fluorite
CaF₂
Halide
Cubic
Mohs 4
Forsterite
Mg₂(SiO₄)
Silicate
Orthorhombic
Mohs 6.5–7
Group
Garnet
X₃Y₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7.5
Gold
Au
Native Element
Cubic
Mohs 2.5–3
Jade
Jadeite or nephrite
Silicate
Monoclinic
Mohs 6–7
Jadeite
NaAlSi₂O₆
Silicate
Monoclinic
Mohs 6–7
Variety
Jasper
SiO₂
Silicate
Trigonal
Mohs 6.5–7
Variety
Labradorite
(Ca,Na)(Al,Si)₄O₈
Silicate
Triclinic
Mohs 6–6.5
Rock
Lapis Lazuli
Rock — mainly lazurite
Silicate
Cubic
Mohs 5–5.5
Group
Lepidolite
K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂
Silicate
Monoclinic
Mohs 2.5–3
Malachite
Cu₂(CO₃)(OH)₂
Carbonate
Monoclinic
Mohs 3.5–4
Variety
Moonstone
KAlSi₃O₈
Silicate
Monoclinic
Mohs 6–6.5
Group
Olivine
(Mg,Fe)₂SiO₄
Silicate
Orthorhombic
Mohs 6.5–7
Opal
SiO₂·nH₂O
Silicate
Hexagonal
Mohs 5.5–6.5
Variety
Peridot
(Mg,Fe)₂SiO₄
Silicate
Orthorhombic
Mohs 6.5–7
Featured
Quartz
SiO₂
Silicate
Hexagonal
Mohs 7
Rhodochrosite
Mn(CO₃)
Carbonate
Hexagonal
Mohs 3.5–4
Rhodonite
CaMn₃Mn(Si₅O₁₅)
Silicate
Triclinic
Mohs 5.5–6.5
Variety
Rose Quartz
SiO₂
Silicate
Trigonal
Mohs 7
Variety
Ruby
Al₂O₃
Oxides & Hydroxide
Trigonal
Mohs 9
Variety
Sapphire
Al₂O₃
Oxides & Hydroxide
Trigonal
Mohs 9
Variety
Smoky Quartz
SiO₂
Silicate
Trigonal
Mohs 7
Sodalite
Na₄(Si₃Al₃)O₁₂Cl
Silicate
Cubic
Mohs 5.5–6
Spodumene
LiAlSi₂O₆
Silicate
Monoclinic
Mohs 6.5–7
Variety
Tanzanite
Ca₂Al₃(SiO₄)₃(OH)
Silicate
Orthorhombic
Mohs 6–7
Topaz
Al₂SiO₄F₂
Silicate
Orthorhombic
Mohs 8
Group
Tourmaline
(Na,Ca)(Mg,Fe,Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
Silicate
Trigonal
Mohs 7–7.5
Turquoise
CuAl₆(PO₄)₄(OH)₈·4H₂O
Phosphate
Triclinic
Mohs 5–6
Zircon
Zr(SiO₄)
Silicate
Tetragonal
Mohs 7.5
Variety
Alexandrite
BeAl₂O₄
Oxides & Hydroxide
Orthorhombic
Mohs 8.5
Variety
Amazonite
KAlSi₃O₈
Silicate
Triclinic
Mohs 6–6.5
Variety
Ametrine
SiO₂
Silicate
Trigonal
Mohs 7
Andalusite
Al₂SiO₅
Silicate
Orthorhombic
Mohs 6.5–7.5
Andradite
Ca₃Fe³⁺₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7
Variety
Aventurine
SiO₂
Silicate
Trigonal
Mohs 7
Group
Axinite
Ca₂(Mn,Fe,Mg)Al₂BSi₄O₁₅(OH)
Silicate
Triclinic
Mohs 6.5–7
Axinite-(Fe)
Ca₄Fe²⁺₂Al₄[B₂Si₈O₃₀](OH)₂
Silicate
Triclinic
Mohs 6.5–7
Benitoite
BaTiSi₃O₉
Silicate
Hexagonal
Mohs 6–6.5
Brazilianite
NaAl₃(PO₄)₂(OH)₄
Phosphate
Monoclinic
Mohs 5.5
Variety
Carnelian
SiO₂
Silicate
Trigonal
Mohs 7
Variety
Chalcedony
SiO₂
Silicate
Trigonal
Mohs 6.5–7
Charoite
(K,Sr,Ba,Mn)₁₅₋₁₆(Ca,Na)₃₂[Si₇₀(O,OH)₁₈₀](OH,F)₄·nH₂O
Silicate
Monoclinic
Mohs 5–6
Variety
Chrysoprase
SiO₂
Silicate
Trigonal
Mohs 7
Mineraloid
Coral
Aragonite skeleton
Carbonate
Orthorhombic
Mohs 3–4
Cordierite
Mg₂Al₄Si₅O₁₈
Silicate
Orthorhombic
Mohs 7–7.5
Corundum
Al₂O₃
Oxides & Hydroxide
Hexagonal
Mohs 9
Danburite
CaB₂Si₂O₈
Silicate
Orthorhombic
Mohs 7–7.5
Variety
Demantoid
Ca₃Fe₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7
Diaspore
AlO(OH)
Oxides & Hydroxide
Orthorhombic
Mohs 6.5–7
Diopside
CaMgSi₂O₆
Silicate
Monoclinic
Mohs 5.5–6.5
Dioptase
CuSiO₃·H₂O
Silicate
Hexagonal
Mohs 5
Elbaite
Na(Al₁.₅Li₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Silicate
Hexagonal
Mohs 7.5
Euclase
BeAlSiO₄(OH)
Silicate
Monoclinic
Mohs 7.5
Fluor-liddicoatite
Ca(Li₂Al)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃F
Silicate
Hexagonal
Mohs 7.5
Variety
Goshenite
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Grandidierite
MgAl₃O₂(BO₃)(SiO₄)
Silicate
Orthorhombic
Mohs 7.5
Grossular
Ca₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7
Hambergite
Be₂(BO₃)(OH)
Borate
Orthorhombic
Mohs 7.5
Variety
Heliodor
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Variety
Heliotrope
SiO₂
Silicate
Trigonal
Mohs 7
Variety
Hessonite
Ca₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7
Variety
Hiddenite
LiAlSi₂O₆
Silicate
Monoclinic
Mohs 6.5–7
Howlite
Ca₂SiB₅O₉(OH)₅
Silicate
Monoclinic
Mohs 3.5
Variety
Iolite
(Mg,Fe)₂Al₄Si₅O₁₈
Silicate
Orthorhombic
Mohs 7–7.5
Mineraloid
Jet
C — fossilized wood
Organic Mineral
Amorphous
Mohs 2.5–4
Kornerupine
(Mg,Fe²⁺,Al, )₁₀(Si,Al,B)₅O₂₁(OH,F)₂
Silicate
Orthorhombic
Mohs 6.5–7
Variety
Kunzite
LiAlSi₂O₆
Silicate
Monoclinic
Mohs 6.5–7
Kyanite
Al₂OSiO₄
Silicate
Triclinic
Mohs 5.5–7
Lazulite
MgAl₂(PO₄)₂(OH)₂
Phosphate
Monoclinic
Mohs 5.5–6
Lazurite
Na₇Ca(Al₆Si₆O₂₄)(SO₄)(S₃)¹⁻·H₂O
Silicate
Cubic
Mohs 5–5.5
Variety
Morganite
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Variety
Moss Agate
SiO₂
Silicate
Trigonal
Mohs 7
Variety
Nephrite
Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
Silicate
Monoclinic
Mohs 6–6.5
Variety
Onyx
SiO₂
Silicate
Trigonal
Mohs 7
Painite
CaZrAl₉O₁₅(BO₃)
Borate
Hexagonal
Mohs 8
Mineraloid
Pearl
Aragonite + conchiolin
Carbonate
Orthorhombic
Mohs 2.5–4.5
Petalite
LiAlSi₄O₁₀
Silicate
Monoclinic
Mohs 6–6.5
Pezzottaite
CsLiBe₂Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 8
Phenakite
Be₂(SiO₄)
Silicate
Hexagonal
Mohs 7.5–8
Phosphophyllite
Zn₂Fe²⁺(PO₄)₂·4H₂O
Phosphate
Monoclinic
Mohs 3–3.5
Variety
Prasiolite
SiO₂
Silicate
Trigonal
Mohs 7
Pyrope
Mg₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 7–7.5
Variety
Red Beryl
Be₃Al₂Si₆O₁₈
Silicate
Hexagonal
Mohs 7.5–8
Rhodizite
KBe₄Al₄(B₁₁Be)O₂₈
Oxides & Hydroxide
Cubic
Mohs 8
Variety
Rhodolite
(Mg,Fe)₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 7–7.5
Sapphirine
Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]
Silicate
Monoclinic
Mohs 7.5
Variety
Sard
SiO₂
Silicate
Trigonal
Mohs 7
Variety
Sardonyx
SiO₂
Silicate
Trigonal
Mohs 7
Group
Scapolite
Marialite–meionite series
Silicate
Tetragonal
Mohs 5.5–6
Schorl
NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)
Silicate
Hexagonal
Mohs 7–7.5
Serendibite
Ca₄[Mg₆Al₆]O₄[Si₆B₃Al₃O₃₆]
Silicate
Triclinic
Mohs 6.5–7
Sinhalite
MgAl(BO₄)
Borate
Orthorhombic
Mohs 6.5–7
Spessartine
Mn²⁺₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 7–7.5
Spinel
MgAl₂O₄
Oxides & Hydroxide
Cubic
Mohs 7.5–8
Sugilite
KNa₂Fe³⁺₂(Li₃Si₁₂)O₃₀
Silicate
Hexagonal
Mohs 6–6.5
Variety
Sunstone
(Ca,Na)(Al,Si)₄O₈
Silicate
Triclinic
Mohs 6–6.5
Variety
Thulite
Ca₂Al₃(SiO₄)₃(OH)
Silicate
Orthorhombic
Mohs 6–7
Variety
Tiger's Eye
SiO₂
Silicate
Trigonal
Mohs 7
Titanite
CaTi(SiO₄)O
Silicate
Monoclinic
Mohs 5–5.5
Variety
Tsavorite
Ca₃Al₂(SiO₄)₃
Silicate
Cubic
Mohs 7–7.5
Uvarovite
Ca₃Cr₂(SiO₄)₃
Silicate
Cubic
Mohs 6.5–7.5
Variscite
Al(PO₄)·2H₂O
Phosphate
Orthorhombic
Mohs 3.5–4.5
Vesuvianite
(Ca,Na)₁₉(Al,Mg,Fe)₁₃(SiO₄)₁₀(Si₂O₇)₄(OH,F,O)₁₀
Silicate
Tetragonal
Mohs 6.5
Zoisite
Ca₂Al₃[Si₂O₇][SiO₄]O(OH)
Silicate
Orthorhombic
Mohs 6–7