Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Fossiliferous Limestone
Biogenic Sedimentary Rock (CaCO3)
sedimentary
Gneiss Pebble
Gneiss
metamorphic
Petrified Wood
Silicified Wood (SiO2)
fossil
Borosilicate Glass (Manufactured)
SiO2 + B2O3 (Silicon dioxide and Boron trioxide)
Synthetic/Amorphous Solid
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Petrified Wood
Silicified wood (SiO2)
fossil
Coal
Carbonaceous sedimentary rock
sedimentary
Moss-covered Rock Fragment
Weathered Rock Fragment with Epilithic Growth
sedimentary
Probable rough basalt or mafic igneous fragment
Fine-grained basalt, likely plagioclase–pyroxene–olivine aggregate
igneous
Basalt
Mafic Igneous Rock
igneous
Sedimentary Rock
Sedimentary rock (lithified sediment)
sedimentary
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Organic Inclusions
fossil
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Banded Chert
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite in Shale
Iron Disulfide (FeS2)
mineral
Red Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Sedimentary Rock
sedimentary
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Orbicular Jasper
Silicon Dioxide (SiO2)
sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Shale
Lutaceous sedimentary rock
sedimentary
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Shell in Limestone
Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Limestone with Lichen/Moss
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Shark Tooth
Chondrichthyes tooth fossil
fossil
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Limestone with embedded fossil cross-section
sedimentary
Gold Ore
Gold bearing rock with native gold (Au)
mineral
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Quartz-rich rock, possibly milky quartz
Quartz (SiO₂); exact specimen identification is uncertain from the photograph
mineral
Pebble (likely Siltstone or fine-grained Sandstone)
Sedimentary Clastic Rock
sedimentary