Quartzite
Quartzite (primarily SiO2)
metamorphic
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Basalt
Basalt (predominantly Plagioclase Feldspar and Pyroxene)
igneous
Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz)
sedimentary
Chert (or Agate/Quartzite)
Microcrystalline Quartz (SiO2)
sedimentary
Corundum (Sapphire and Ruby)
Aluminum Oxide (Al2O3)
mineral
Pegmatite with Quartz and Muscovite Mica
Granitic Pegmatite (KAl2(AlSi3O10)(OH)2 + SiO2)
igneous
Granitic Pegmatite
Pegmatite containing Quartz, Pink Potassium Feldspar, and Muscovite Mica
igneous
Granitic Pegmatite with Muscovite Mica
Pegmatite (containing KAl2(AlSi3O10)(OH)2)
igneous
Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
Mineral
Diamond (Cut Gemstone)
Carbon (C)
mineral
Rough Blue Diamond
Carbon (C) - Type IIb Diamond
mineral
Granitic Pegmatite with Tourmaline/Chlorite
Pegmatite
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Diamond (in jewelry)
Cubic Carbon (C)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Natural Diamond (Faceted)
Diamond (pure carbon crystal, C)
mineral
Diamond
Carbon (C)
mineral
Ruby
Corundum (Al2O3 with Chromium trace)
mineral
Diamond Druzy (Crystalline Diamond)
Carbon (C)
mineral
Gold
Gold (Native Element); Au
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Magnetite / Hematite mix (Iron Ore)
Fe3O4 (Magnetite) / Fe2O3 (Hematite)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Grey Agate
Silicon Dioxide (SiO2) - variety: Agate/Chalcedony
mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Diamond (in jewelry)
Carbon (C)
mineral
Agate
Agate (Silicon Dioxide, SiO2)
mineral