Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Mineral (Organic Gemstone)
Browse mineral (organic gemstone) specimens identified by the Rock Identifier community.
Baltic Amber (Butterscotch variety)
Succinite
Organic Gemstone/Mineraloid
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Organic Gemstone (Mineraloid)
Chert (Jasper-bearing)
Microcrystalline silica (SiO2) with iron oxide inclusions
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Turquoise (with Hematite)
CuAl6(PO4)4(OH)8·4H2O
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Green Aventurine
Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Banded Agate (specifically Moss Agate or Plume Agate variety)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (often referred to as Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
metamorphic
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Lazulite
Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)
mineral
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Chert (Jasper-like Silicate)
Microcrystalline quartz (SiO2)
sedimentary
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Amethyst (Quartz variety)
Amethyst - SiO2 (Silicon Dioxide with Iron impurities)
mineral
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Baltic Amber (Butterscotch or Egg Yolk Variety)
Fossilized Tree Resin (Succinite); Approximate formula: C10H16O
Organic Gemstone (Succinite)
Precious Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Malachite in Matrix
Copper Carbonate Hydroxide (Cu2CO3(OH)2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (variations include Flint/Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary