Tanzanite
Blue/Violet Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
mineral
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn%,Fe%,Mg,Ca)SiO₃
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Moonstone
Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)
mineral
Fluorite (Purple/Blue variety)
Calcium Fluoride (CaF2)
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Green Quartzite
Quartzite (SiO2)
metamorphic
Fossil Shark Tooth (Otodus obliquus)
Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))
sedimentary (fossiliferous)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Jadeite and Assorted Corundum (Ruby/Sapphire) / Beryl (Emerald)
Jadeite (NaAlSi2O6), Ruby/Sapphire (Al2O3), Emerald (Be3Al2(SiO3)6)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of Iron Oxide)
Metamorphic
Black Opal
Hydrated Amorphous Silica (SiO2 "n" H2O)
gemstone
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Quartzite with Quartz Vein
Metamorphosed Quartz-rich Arenite (SiO2)
metamorphic
Beryllonite
Beryllonite (NaBePO4)
mineral
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide - SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Shale
Fissile mudstone (rich in clay minerals and quartz)
sedimentary
Pegmatite with Black Tourmaline
Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, along with Calcite and Pyrite)
metamorphic
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Ruby in Zoisite (Anyolite)
Corundum var. Ruby in Zoisite (Al2O3 + (Ca2Al3(SiO4)3(OH)))
metamorphic
Staurolite
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)
igneous
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Blue Topaz
Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)
mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
Iolite (Cordierite)
Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18
Mineral