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Category
Rock
Browse rock specimens identified by the Rock Identifier community.
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Not a rock
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Wishing Stone (Quartz-veined Metamorphic/Sedimentary Rock)
Quartz Vein in Greywacke/Slate (SiO2 in host rock)
metamorphic
Angular gray rock fragments
Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification
igneous
Granite (weathered cobble)
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
Granite
Intrusive Igneous Rock
igneous
Granite Pebble with Quartz Vein
Granite (Plutonic Igneous Rock) with Quartz (SiO2)
igneous
Sandstone Pebble with Mineral Encrustation
Quartz Sandstone with Calcite/Halite Crust
sedimentary
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
River Rock
Sedimentary clast
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Desert Rose
Gypsum (CaSO4·2H2O) or Barite (BaSO4)
mineral
Puddingstone (Quartzite Pebble)
Metaconglomerate / Jasper-Quartzite Pebble
sedimentary
Quartzite Pebble (River Siltstone/Quartzite)
Quartzite (SiO2 composition)
metamorphic
Dark igneous rock, likely basalt or diabase, with a second purplish specimen
Basalt/diabase; exact identification is uncertain from the photograph
igneous
Crushed stone aggregate
Mixed lithic aggregate; individual fragments cannot be identified from the image
sedimentary
Vesicular Basalt
Vesicular Basalt
igneous
Shale
Argillite / Shale
sedimentary
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
fossil
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Quartzite with Quartz Veining
Metamorphic Quartzite (SiO2)
metamorphic
Likely banded gneiss
Quartz–feldspar–mica gneiss (tentative visual identification)
metamorphic
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Quartz Vein in Metamorphic Rock
Quartz-veined Schist or Gneiss
metamorphic
Smooth river pebble (exact rock type indeterminate)
Unidentified rounded lithic clast; composition cannot be determined from the photograph
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Fossilized wood (petrified wood)
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Granite
Felsic intrusive igneous rock
igneous
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral