Chert
Microcrystalline quartz (SiO2)
Category
Browse man made material (metal) specimens identified by the Rock Identifier community.
Chert
Microcrystalline quartz (SiO2)
Flint
SiO2 (Microcrystalline Quartz / Chert)
Chert
Microcrystalline quartz (SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Chert / Flint
Microcrystalline Quartz (SiO2)
Granite
Granite (phaneritic felsic intrusive rock)
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (color due to lead)
Granite
Granitoid (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8 + SiO2)
Banded Chert
Microcrystalline Quartz (SiO2)
Pearl
Aragonite (CaCO3 with conchiolin)
Red Chert (Jasper)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Flint (or Chert)
Cryptocrystalline Quartz (SiO2)
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
Quartzite (River Pebble)
Quartzite (Mainly SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Milk Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
Quartzite
Quartzite (SiO2)
Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
White Marble
Recrystallized Calcite (CaCO3)
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
Mica schist, likely biotite–muscovite schist
Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.
Chert (Basanite / Flint)
Microcrystalline silica (SiO2)
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
Bauxite
Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))
Amethyst (or Light Amethyst / Rose Quartz)
Quartz (Silicon Dioxide, SiO2)
Coquina / Fossiliferous Limestone
Fossiliferous Limestone (Calcite, CaCO3)
Pyrite
Iron Sulfide (FeS2)
Chert
Chert (Microcrystalline Quartz, SiO2)
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)