Chert (or possibly Flint)
Chert (variant: Flint)
Sedimentary
Category
Organic (Geological Relative)
Browse organic (geological relative) specimens identified by the Rock Identifier community.
Biotite Schist
Biotite Schist
Metamorphic
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Granite
Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)
igneous
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Chert (or Flint)
Silicon dioxide (SiO2)
sedimentary
Chert Pebble (Jasperoid/Flint)
Silicon Dioxide (SiO2) - cryptocrystalline quartz
Sedimentary
Chert Pebble/Nodule
Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)
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)
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Fossil Coral
Fossilized Scleractinia or Tabulata (various genera/species)
Sedimentary
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock