Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral
Category
Organic Gemstone (Sedimentary Associations)
Browse organic gemstone (sedimentary associations) specimens identified by the Rock Identifier community.
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Chalcedony (Agate/Carnelian)
Cryptocrystalline Quartz (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
Mineral
Carnelian
Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)
mineral
Druzy Chalcedony/Quartz on Fluorite core
Silicon Dioxide (SiO2) on Calcium Fluoride (CaF2)
mineral
Chert (Yellow Jasper/River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Angelite
Anhydrite (Calcium Sulfate, CaSO4)
mineral
Honey Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Quartz (Milky/Crystalline)
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Chalcedony
Chalcedony (SiO2)
mineral
Banded Chert (Agate-like Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Caribbean Calcite
Calcium Carbonate (CaCO3) with Aragonite
mineral
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Chert (specifically Flint or Jasper variant)
Chert (Siliceous rock composed of microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Coal (specifically Bituminous or Anthracite)
Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral