Pink Anthracite Coal (dyed)
Anthracite Coal (Artificially Colored)
Sedimentary Rock (Altered)
Category
Mineral (Man Made Glass, Not Natural)
Browse mineral (man made glass, not natural) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass, Not Natural) in the encyclopedia
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Quartz Druze (on Matrix)
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Greenschist / Greenstone
Greenschist facies metabasite
metamorphic
Amethyst Cluster
Silicon Dioxide (Quartz variety: Amethyst), SiO2
mineral
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Sandstone with Iron Oxide Coating
Arenite (SiO2 with Fe2O3 impurities)
sedimentary
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
mineral
Quartz (Variety: Agate / Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
igneous
Nephrite Jade
Nephrite
Mineral/Rock
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid / impact glass
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Black Tourmaline (Schorl)
NaFe2+3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2) on host rock
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
mineral
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Smoky Quartz (Rough Specimen)
Silicon Dioxide (SiO2)
mineral
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
sedimentary
Black Freshwater Pearls
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Diamond
Carbon (C)
gemstone
Amethyst
Silicon dioxide (variant with ferric iron impurities), SiO2
mineral
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Igneous
Clear Quartz (Milky Quartz pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine-colored Quartz)
Silicon Dioxide (SiO2)
mineral
Amethyst cluster
Quartz, SiO₂, violet variety (amethyst)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
gemstone
Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
Iron-Stained Quartz (Red/Hematoid Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Clear Quartz (Crystal Quartz)
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Tumbled jasper (likely picture jasper or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides
sedimentary