Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
Category
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
Pegmatite
Igneous Pegmatite (Quartz, Feldspar, Micas)
Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite or Limonite staining
Pegmatite
Pegmatitic Granite containing Quartz, Feldspar, and Schorl
Schist
Schist (variety likely Mica Schist)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Vuggy Quartz / Chert
Silicon Dioxide (SiO2)
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
Agate Nodule
Silicon Dioxide (Quartz/Chalcedony), SiO2
Pink Quartz
Silicon Dioxide (SiO2)
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
Quartz Pebble
Silicon Dioxide (SiO2)
Agate
Silicon dioxide (Chalcedony), SiO2
Garnet
Silicate mineral group (often Pyrope or Almandine in this color range)
Vesicular Basalt
Aphanitic Mafic Volcanic Rock
Chalk (Sedimentary Limestone)
Calcite (CaCO3)
Pink Sapphire (Corundum)
Aluminum Oxide (Al2O3) with Chromium/Iron impurities
Bicolor Quartz (Milk Quartz with Slag or Dark Inclusions)
Silicon Dioxide (SiO2) with impurities
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
Orange Calcite
Calcium Carbonate (CaCO3)
Iron Ore (Hematite/Goethite)
Ironstone (Fe2O3 / FeO(OH))
Iron Slag
Anthropogenic pyrometallurgical byproduct
Obsidian
Volcanic Glass (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Milky Quartz
Silicon Dioxide (SiO2)
Iron meteorite fragment
Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment
Wollastonite
Calcium Inosilicate Mineral, CaSiO3
Limestone with Calcite Crystals
Sedimentary Rock containing Calcium Carbonate (CaCO3)
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Quartzite
Quartzite (SiO2)
Red Jasper (possibly Wonderstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
Slag (Industrial Glass)
Artificial Vitreous Silicate
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Pumice
Pumiceous volcanic glass