Pink Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin (CaCO3)
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone (Weathered)
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)
igneous
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Turquoise (possible Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Ferruginous Sandstone (Iron-rich Sandstone)
Ferruginous Arenite
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Obsidian (Apache Tears)
Volcanic Glass (Silicic Obsidian)
igneous
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Riverstone Jasper (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Granite
Granite (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pink Sapphire
Corundum (Al2O3 with Chromium/Titanium/Iron traces)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Dream Amethyst (Chevron Amethyst)
Silicon Dioxide with inclusions (SiO2)
mineral
Black Tourmaline in Quartz
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) in Silicon Dioxide (SiO2)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Hagstone/Gasket Rock variant)
Chert (SiO2)
sedimentary
Citrine
Silicon Dioxide (SiO2) - Yellow Quartz variety
mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Beryl (Emerald Variety)
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Sandstone
Arenite (primarily SiO2, silica)
sedimentary