Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Opalite Egg
Synthetic Glass (Simulated Opal)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled green gemstone, likely dyed howlite or serpentine
Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing
mineral
Siltstone
Siltstone
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite River Pebble
Metamorphosed sandstone (SiO2)
metamorphic
Chert (often called Jasper or Flint)
Silicon Dioxide (SiO2)
sedimentary
Tumbled pale green aventurine (probable)
Quartz, SiO₂, with dispersed fuchsite or other green inclusions
mineral
Quartzite
Metamorphic Quartz Arenite
metamorphic
Coal (Anthracite)
Anthracite coal (Carbon C)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Opalite
Synthetic Glass (Silica-based)
gemstone
Limonite or Ironstone Nodule
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2-rich)
igneous
Quartzite with inclusions
Metamorphic Quartzite (SiO2)
metamorphic
Amber
Succinates (Organic Fossilized Resin)
mineral
Amber
Succiniferous organic material (Succinite)
fossil
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amber
Succinates (Organic Fossilized Resin)
mineraloid
Chert (specifically Flint or Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rough Diamond
Diamond (Native Element Carbon, C)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Shell Fragment / Mother of Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite biomineral
fossil
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
River Cobble (Quartzite)
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Mahogany Obsidian
Volcanic glass (Silicon Dioxide with Hematite/Magnetite inclusions)
igneous
Boulder Opal
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Black Obsidian
Volcanic Glass (SiO2)
igneous