Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper / Chert (River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (likely Graywacke or Lithic Sandstone)
Clastic Sedimentary Rock
sedimentary
Mica (Muscovite)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Quartzite (River Cobble)
Metamorphic Quartz-rich Rock
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Blue Aventurine
Silicon Dioxide (SiO2) with inclusions of Dumortierite
Mineral (Variety of Quartz)
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Prase Quartz on Feldspar
Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)
mineral
Limestone
Sedimentary Calcite (CaCO3)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Greenschist
Greenschist (comprising Actinolite, Chlorite, and Epidote)
metamorphic
Sandstone (likely Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)
sedimentary
Siltstone with iron staining
Siltstone (primarily SiO2 with FeO(OH) coatings)
sedimentary
River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Gold
Native Gold (Au)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides
mineral
Green Fuchsite in Quartz (sometimes called Green Aventurine)
Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2
metamorphic
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Chert (Jasper/Quartzite river pebble)
Microcrystalline Silica (SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Amber
Succinite (C10H16O)
mineraloid
Granite Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary