Amethyst
Silicon dioxide (SiO2)
mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
Hypersthene
Hypersthene (formula: (Mg,Fe)SiO3)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Amazonite in Matrix
Potassium Feldspar (Microcline), KAlSi3O8
mineral
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Sunstone
Plagioclase feldspar (with Copper or Hematite inclusions)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Rough Emerald
Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)
mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class); commonly Clypeasteroida for sand dollar types
sedimentary (fossil)
Labradorite
Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Astrophyllite
Potassium Sodium Iron Manganese Titanium Silicate Hydroxide (K3NaFe7Ti2Si8O24(OH)7)
mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8)
Mineral
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
Schorl (Black Tourmaline) in Quartz and Feldspar
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
K2 Jasper (K2 Granite)
Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)
igneous
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and mineral inclusions
sedimentary
Shatter Cone
Impactite (Shatter Cone texture)
metamorphic
Chrysocolla
Chrysocolla; (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
K2 Jasper (K2 Granite)
Azurite-in-Granite
igneous
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)
metamorphic
Ruby in Kyanite
Al2O3 (Corundum) in Al2SiO5 (Kyanite-Fuchsite-Quartz)
metamorphic
Gold Nugget
Native Gold (Au)
Mineral
Amazonite
Microcline (KAlSi3O8) with lead inclusions
mineral
Lazulite
Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)
mineral
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Eudialyte in Syenite (Dragon Blood Stone)
Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2
igneous
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Greenschist / Migmatite
Regional Metamorphic Complex (Facies: Greenschist to Amphibolite)
metamorphic
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Carnelian
Carnelian (a variety of Chalcedony, SiO₂)
Mineral
Crazy Lace Agate
Chalcedony (SiO2)
Mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary