Organic Material (Likely A Fruit Or Berry)

Browse organic material (likely a fruit or berry) specimens identified by the Rock Identifier community.

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Mineral

Amber (Simulated/Faturan Style)

Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)

Organic Gemstone (not a mineral)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Metamorphic Rock

Pyrite

Pyrite (Iron Disulfide), FeS2

Mineral

River Cobble (likely Sandstone or Siltstone type)

Sandstone or Siltstone (common rock types that form river cobbles)

Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

mineral

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Synthetic (glass)

Shale

sedimentary

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Igneous

Chert (Jasper-like)

SiO2 (Cryptocrystalline Quartz)

Sedimentary

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Mineral

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Sedimentary or Metamorphic (low-grade)

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

mineral

Shale

Shale (clastic sedimentary rock)

Sedimentary

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)

Petrified Wood

Silicified wood, primarily composed of Quartz (SiO2)

Mineral, often found in sedimentary deposits

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral