Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Category
Organic Gem Material (Botanical)
Browse organic gem material (botanical) specimens identified by the Rock Identifier community.
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Basalt with Olivine Phenocrysts
Porphyritic Basalt (Mineral formula of Olivine: (Mg,Fe)2SiO4)
Igneous
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Amethyst
SiO2 (Silicon Dioxide) with Iron (Fe3+) impurities
mineral
Rose Quartz
Rose Quartz (SiO2 with traces of Ti, Fe, or Mn)
mineral
Coral (Precious Coral)
Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).
Mineral, Organic Gemstone
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Shale
Shale
sedimentary
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amber
Succinite (C10H16O)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst and Titanium Treated Druzy
Silicon Dioxide (SiO2) with trace impurities including Iron
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Amethyst
Silicon Dioxide (SiO2) with traces of Iron and Manganese
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Garnet
Garnet Group (e.g., Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3)
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Blue Apatite
Fluorapatite / Ca5(PO4)3F
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities) - SiO2
mineral
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Coquina
Bioclastic Limestone
sedimentary
Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
Amethyst (Rough)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral