Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Category
Anthropogenic Material (Man Made Sedimentary Mimic)
Browse anthropogenic material (man made sedimentary mimic) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Yellow Quartz (Citrine Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Serpentinite
Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Diamond
Native Carbon (C)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Malachite
Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)
Mineral
Granite
Course-grained intrusive igneous rock
igneous
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert (or possibly Flint)
SiO2 (Silicon Dioxide)
Sedimentary Rock
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Granite
Granitoid
igneous
Chalcedony (Botryoidal Agate)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Graphite
Graphite (Carbon, C)
metamorphic
Potassium Feldspar and Quartz
KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)
mineral
Magnetite
Magnetite (Fe3O4)
Mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Diamond
Diamond (C)
Mineral
Diamond
Diamond (C)
Mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Jade
Jadeite or Nephrite
Mineral/Mineraloid