Ammonite fossil
Fossilized ammonoid cephalopod, commonly classified within Ammonoidea
fossil
Category
Organic Gemstone (Not A Mineral)
Browse organic gemstone (not a mineral) specimens identified by the Rock Identifier community.
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Obsidian
Extrusive igneous volcanic glass
igneous
Amber (Copal)
Succinite (fossilized tree resin)
mineral
Amber
Succinite (C10H16O)
mineraloid
Moss Agate
Cryptocrystalline Quartz (SiO2 with Manganese or Iron Oxide inclusions)
mineral
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Lapis Lazuli
Lapis lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Obsidian with Slate/Tuff
Volcanic glass (SiO2) with associated pyroclastic rock
igneous
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Likely amber or amber-like resin fragment
Amber (fossilized plant resin), commonly succinite; identification uncertain from the image
gemstone
Moss Agate
SiO2 (Cryptocrystalline Quartz)
gemstone
Green Moss Agate
Silicon Dioxide (SiO2) with Mineral Inclusions
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxide
mineral
Amber
Fossilized Tree Resin (Succinate)
mineral
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Amber
Succinite (Resinite)
fossil
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions of Chlorite, Manganese, or Iron
mineral
Amber
Succinite (organic gemstone, approx. C10H16O)
fossil
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Fancy Jasper
Jasper (Cryptocrystalline Quartz, SiO2)
sedimentary
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Jasper
Microcrystalline Quartz (SiO2)
gemstone
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Amber
Succinite (fossilized tree resin)
fossil
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Amber
Succinates
mineraloid
Imitation or Cultured Pearl Earrings
Calcium carbonate (CaCO3) or synthetic polymer/glass
gemstone
Amber (Raw Copal)
Fossilized Plant Resin (Gummite/Succinite)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (approximate formula C10H16O)
mineral
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (fossilized organic resin)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
mineral