Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Diamond
Carbon (C)
Mineral
Sapphire
Corundum (Al2O3)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Banded Agate (Lace Agate)
Agate (Variety of Cryptocrystalline Quartz), SiO2
mineral
Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Wishing Stone with Quartz Vein
Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)
metamorphic
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Blue Topaz
Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Onyx (beads)
SiO2 (Cryptocrystalline Quartz)
Mineral
Citrine
Quartz (SiO₂)
mineral
Granitic Pegmatite
Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Blue Zircon
Zirconium Silicate (ZrSiO4)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ruby (Corundum)
Corundum (Aluminum Oxide) with chromium trace elements, Al2O3
mineral
Green Tourmaline (Verdelite)
Elbaite (Complex Borosilicate: Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Star Diopside
Diopside (CaMgSi2O6) with Magnetite inclusions
mineral
Satin Spar (often sold as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Jasper)
sedimentary
Chert or Flint (polished/water-worn)
Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.
Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)
Amethyst Geode (polished heart-cut)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary