Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
Category
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
Vesicular Basalt (or Scoria)
Vesicular Basalt
Gneiss
High-grade regional metamorphic rock (Foliated)
Granite
Granite (Phaneritic intrusive igneous rock)
Basalt
Basalt
Iron Meteorite / Limonite-coated Meteorite / Iron Nodule
Iron-Nickel Alloy (Kamacite and Taenite) with weathering crust
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
Quartzite
Metamorphic Quartzite (SiO2)
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
Granite
Felsic intrusive igneous rock
Granite
Intrusive Igneous Rock
Granite
Felsic intrusive igneous rock
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
Diorite
Intermediate plutonic igneous rock
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
Granite Cobble
Phaneritic Felsic Igneous Rock
Basalt
Basalt (Mafic volcanic rock)
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
Celestine
SrSO4
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
Tiger’s eye
Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂
Pegmatite
Igneous Pegmatite
Quartz / Agate Nodule
Silicon Dioxide (SiO2)
Red Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
Pegmatite
Igneous Pegmatite (Quartz, Feldspar, Micas)
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
Yellow Quartz
Silicon Dioxide (SiO2)
Tourmaline
Schorl (Complex boron silicate, NaFe3Al6(Si6O18)(BO3)3(OH)4)
Smoky Quartz
Silicon Dioxide (SiO2)
Black Tourmaline (Schorl)
Schorl (Complex sodium iron aluminum borosilicate)
Sapphire
Corundum (Al2O3)
Tumbled Quartz
Silicon Dioxide (SiO2)
Agate
Silicon Dioxide (Chalcedony), SiO2
Anthracite Coal
Carbon (with organic impurities)
Geode (Small unopened nodule)
Quartz-lined nodule (SiO2)
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
Blue Apatite
Apatite Group (Ca5(PO4)3(F,Cl,OH))
Diamond (or Cubic Zirconia / Gemstone Ring)
C (Carbon) for natural Diamond
Limestone (with possible Crinoid or Fossil Impression)
Calcium Carbonate (CaCO3) / Calcite
Ruby (Raw Corundum)
Alumina (Al2O3) with Chromium traces