Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Chert (specifically Gray/Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Satin Spar (commercially called Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Blue Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Chert/Tiger's Eye composite)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Basalt
Basalt (extrusive igneous rock)
Igneous
Garnet
Garnet Group (Silicate Minerals)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Rhodolite Garnet
Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3
mineral
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Ironstone (likely Ferruginous Siltstone/Sandstone)
Ferruginous sedimentary rock (FeOx-rich clastic)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Quartz Pebble)
Silicon Dioxide (SiO2)
sedimentary
Iron Slag
Vitreous glassy waste (Fe-Si-Al-Ca compounds)
Mineral byproduct (anthropogenic / techno-fossil)
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Pink Chalcedony (Agate/Jasper blend)
Silicon Dioxide (SiO₂)
mineral
Laterite
Laterite (Iron and aluminum-rich residual rock)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Grey Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Chert (specifically tan/pink variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
sedimentary
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone (Iron-potassium phyllosilicate mineral: (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Chert (specifically Blue Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary
Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Kyanite (Blue Kyanite)
Kyanite (Al2SiO5)
mineral
Garnet Schist
Almandine Garnet Schist
metamorphic
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Chalcedony
Chalcedony (SiO2)
mineral