Turquoise cabochon
Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)
gemstone
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
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Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Sandstone
Arenite
sedimentary
Diamond
Diamond (pure carbon; C)
Mineral
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Hag Stone (Odin Stone / Adder Stone)
Perforated Pebble (commonly Chert, Mudstone, or Limestone)
sedimentary
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral
Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Mystic Topaz
Coated Al2SiO4(F,OH)2
gemstone
Limonite (Yellow Ochre)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Limonite (Ironstone)
Limonite (FeOO·nH2O)
mineral
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary
Lapis Lazuli
Lapis Lazuli (Complex aggregate including Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Sandstone
Arenite
sedimentary
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)
Silicified limestone or banded sedimentary rock with mineral veins
sedimentary
Sandstone
Sandstone (Arenite)
sedimentary
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Granite (Giallo Ornamental / Venetian Gold)
Granite (composed mainly of Quartz, Feldspar, Biotite, and Garnet)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Banded Sedimentary Rock
Stratified Siliciclastic / Arenite or Siltstone with Mineral Bands
sedimentary
Limonite (Pseudomorph after Pyrite/Marcasite)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Hag Stone
Perforated Sedimentary Rock (typically Flint, Chert, or Limestone)
sedimentary
Kimberlite
Ultramafic igneous rock
igneous
Sandstone
Arenite (principally SiO2)
sedimentary