Polished/tumbled calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Category
Mineral Based Human Made Alloy
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
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Blue-dyed magnesite beads (often sold as “turquoise howlite”)
Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Aura Quartz
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Turquoise
Hydrate phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Cubic Zirconia (Diamond Simulant)
Zirconium Dioxide (ZrO2)
gemstone
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Calcareous sedimentary rock (often Chert, Flint, or Limestone)
sedimentary
Malachite
Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2
Mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Chert (with small quartz inclusion)
Microcrystalline Silica (SiO2)
sedimentary
Metallic iron meteorite (probable)
Iron meteorite, typically kamacite–taenite (Fe–Ni alloy)
meteorite
Granite
Granite (Phaneritic igneous rock)
igneous
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Bauxite
Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Granite
Phaneritic Granitoid
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Likely weathered basalt or mafic volcanic rock
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Tumbled black-and-white stone, likely dendritic agate or jasper
Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites
mineral
Polished rose quartz
Rose quartz (quartz), SiO₂
mineral
Tumbled orange chalcedony and a gray stone disk
Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate
mineral
Tumbled white chalcedony (milky agate)
Microcrystalline quartz, SiO₂; chalcedony, locally grading toward milky agate
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Tektite
Natural impact glass
meteorite
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary