Corundum
Corundum (Al2O3)
Mineral
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Rough Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Greenschist
Greenschist facies rock
Metamorphic
Diamond
Diamond (C)
Mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Opal
Hydrous silicon dioxide (SiO2·nH2O)
mineral
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Smoky Quartz (Chlorite Inclusions)
Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Diamond
Diamond (C)
Mineral
Orange Calcite (likely polished specimen)
Calcite
Mineral
Leopard Skin Jasper
Chalcedony (cryptocrystalline Quartz)
Mineral
Red Jasper
Jasper (a variety of Quartz, SiO2)
Mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Aquamarine
Aquamarine (Beryl variety); Be3Al2Si6O18
mineral
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide) with trace iron impurities
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
mineral
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Fluorite (Purple Fluorite in Matrix)
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Seraphinite
Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.
Mineral
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Included Quartz Beads (likely Phantom Quartz or Garden Quartz)
Quartz (SiO2) with various mineral inclusions
Mineral
Peridot
Olivine (specifically, the gem-quality variety forsterite, (Mg,Fe)2SiO4)
Mineral
Peridot (likely, given the color and bead form)
Olivine, variety Peridot (Mg,Fe)2SiO4
Mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral