Ruby
Corundum (Al2O3 with Chromium traces)
Category
Browse industrial byproduct specimens identified by the Rock Identifier community.
Ruby
Corundum (Al2O3 with Chromium traces)
Copper Nugget
Native Copper (Cu)
Blue Sapphire
Corundum (Al2O3)
Diamond
Carbon (C)
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Sapphire
Corundum (Al2O3)
Anthracite Coal
Anthracite (Carbon)
Pegmatite with Black Tourmaline
Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
Quartz Geode Fragment
Silicon Dioxide (SiO2)
Orange Calcite (Banded Honey Calcite)
Calcium Carbonate (CaCO3)
Chert (specifically Red Chert/Jasper nodule)
Microcrystalline Quartz (SiO2)
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Anthracite Coal
Anthracite
Sapphire
Corundum (Al2O3)
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (Fe2O3)
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
Almandine Garnet in Schist Matrix
Almandine - Fe3Al2(SiO4)3
Rough Topaz
Aluminum silicate fluoride hydroxide [Al2SiO4(F, OH)2]
Granitic Pegmatite
Granitic Pegmatite (primarily SiO2 with KAlSi3O8)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
Basalt
Basalt (Mafic volcanic rock)
Rough Aquamarine
Beryl (Be₃Al₂Si₆O‑₁₈)
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 cement)
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Quartzite
Quartzite (Primary mineral: SiO2)
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
Chalcedony (specifically Common Opal or Agate variant)
Silicon Dioxide (SiO2)
Diamond
Diamond (C)
Pink Quartzite
Quartzite (primarily SiO2)
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (composed primarily of Magnetite Fe3O4, Hematite Fe2O3, and Chert/Quartz SiO2)
Anthracite Coal
Anthracite
Bumble Bee Jasper
Calcite-bearing Volcanic Tuff (not a true Jasper)
Quartzite
Quartzite (SiO2)
Quartz (River Pebble)
Silicon Dioxide (SiO2)
Pink Tourmaline (Rubellite)
Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH
Milky Quartz
Quartz (Silicon Dioxide - SiO2)