Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Granite (Phaneritic Igneous Rock)
Granite
igneous
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Orange Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Diamond (in jewelry)
Diamond (Carbon, C)
mineral
Vanadinite
Lead Chlorovanadate - Pb5(VO4)3Cl
mineral
Diamond (set in a gold ring)
Carbon (C) - Adamantine cubic carbon
mineral
Quartz (Milky/Yellowish)
Silicon Dioxide (SiO2)
mineral
Chert (Chert Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Granitic Pegmatite
Coarse-grained Igneous Rock (Granitic composition: KAlSi3O8, SiO2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Metamorphosed Coal)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO₂)
mineral
Druzzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
mineral
Red Jasper (possibly Brecciated)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt (or Porphyry)
Porphyritic Basalt (Mafic volcanic rock with phenocrysts)
igneous
Jasper pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary
Diamond (Macled/Crystal fragment)
Carbon (C), isometric crystal system
mineral
Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Tiffany Stone
Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)
metamorphic
Green Aventurine (Quartz)
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Anthracite Coal
Anthracite
metamorphic
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Graphic Granite
Graphic Granite (a variety of Pegmatite)
igneous
Quartzite (or Milky Quartz pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chalk (Sedimentary Pebble)
Calcium Carbonate (CaCO3) - Biogenic Limestone
sedimentary
Pegmatite
Granitic Pegmatite
igneous
Quartz with mica and feldspar (Pegmatite fragment)
Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Laterite (Iron-rich bauxite or Gossan)
Ferricrete (Fe2O3·nH2O)
sedimentary