Green Calcite
Calcium Carbonate (CaCO3)
mineral
Category
Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)
Browse organic gemstone (not a rock or mineral in the traditional sense, but bio mineralized material) specimens identified by the Rock Identifier community.
Learn about Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material) in the encyclopedia
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Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Diamond (in Matrix)
Carbon (C)
mineral
Amber
Succinite (Fossilized Resin)
mineral
Fossil Shark Tooth
Selachii fossil
fossil
Mammoth Tooth
Mammuthus tooth
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Diamond
C (Native Carbon)
gemstone
Pearl
Calcium Carbonate (CaCO3) + Conchiolin
mineral
Rough amethyst-bearing quartz specimens
Quartz, SiO₂; purple coloration from trace iron and irradiation
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Chert (often called Flint in dark varieties)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert with Quartz Veining
Silicon Dioxide (SiO2)
sedimentary
Ruby
Corundum (Al2O3)
mineral
Weathered granitic rock
Granite or granodiorite, likely quartz–feldspar–mica aggregate
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fossilized Bone Fragment
Vertebrate Fossil Material (Apatite/Calcium Phosphate)
fossil
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Green Aventurine (or Xiuyan Jade / Serpentine)
Silicon Dioxide (SiO2) with Fuchsite inclusions or Magnesium Silicate
metamorphic
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Copper Ore with Malachite and Chalcocite
Copper-bearing Mineral Assemblage (Cu2CO3(OH)2 + Cu2S)
mineral
Travertine (Tufa)
Chemical Limestone (CaCO3)
sedimentary
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Precious Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Pink Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Chert (Yellow/Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Tremolite-Actinolite solid solution series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic