Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Category
Organic (Non Rock)
Browse organic (non rock) specimens identified by the Rock Identifier community.
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Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt
Basalt (Mafic Volcanic Rock)
igneous
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Unidentified weathered rock fragment
Indeterminate; possibly vesicular basalt or weathered volcanic rock
igneous
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Quartzite Cobble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Limestone with Fossil Fragment
Sedimentary carbonate rock (CaCO3)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Fossiliferous Shale
Laminated Mudrock with plant fossils
sedimentary
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Barite
Barium sulfate (BaSO4)
mineral
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2-rich rock)
metamorphic
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite (mostly crystalline SiO₂), possibly quartz-rich schist or vein quartz
metamorphic
Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Ironstone Concretion (Moqui Marble / Boji Stone)
Sedimentary Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Igneous Volcanic Rock)
igneous
Quartzite pebble
Metamorphic rock (mainly SiO2)
metamorphic
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Likely weathered granite or granitic gneiss
Quartz–feldspar–mica rock; possibly gneissic granite
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Chert (Jaspery variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (White Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossiliferous Limestone
Biogenic Limestone with Brachiopod/Crinoid fragments
sedimentary
Chert (Flint Nodules)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline or cryptocrystalline Silica, SiO2)
sedimentary