Banded Sandstone (River Cobble)
Arenite Sandstone with heavy mineral layering
sedimentary
Category
Mineral (Synthetic Paper And Ink Polymorph)
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
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Pink feldspar fragment
Likely potassium feldspar (orthoclase or microcline), KAlSi₃O₈
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (mostly amorphous SiO2)
igneous
Aragonite Star Cluster
Aragonite (Sputnik habit) - CaesarCO3
mineral
Kyanite (Blue and Green varieties)
Kyanite (Al₂SiO₅)
mineral
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Pyrite (FeS2)
mineral
Desert Rose (Baryte or Selenite)
Barium Sulfate (BaSO4) or Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Tumbled honey calcite (likely aragonite/calcite material)
Calcite, CaCO₃; possibly aragonite, a polymorph of CaCO₃
mineral
Silicon Carbide (Carborundum)
Silicon Carbide, SiC
mineral
Ruby (in costume jewelry context)
Corundum (Al2O3) with Chromium impurities
mineral
Opalite
Synthetic glass / Opalized glass
gemstone
Sandstone
Arenite (SiO2 principal)
sedimentary
Chiastolite (Andalusite)
Al2SiO5
metamorphic
Faceted gemstones, likely assorted quartz or glass-like gems
Not determinable from the photograph; possible quartz (SiO₂), topaz, or synthetic cubic zirconia
gemstone
Graphite
Graphite (C)
mineral
Aragonite crystal cluster
Aragonite, orthorhombic calcium carbonate (CaCO₃)
mineral
Amber
Succinite (fossilized tree resin)
fossil
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
The user-provided image does not contain a rock or mineral specimen
N/A
Blue Kyanite in Quartz
Kyanite (Al2SiO5)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Opalite
Synthetic opalescent glass
glass
Ruby (set in a ring; possibly synthetic or imitation)
Corundum, Al₂O₃; red color is typically caused by chromium
gemstone
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Snowflake Obsidian
Volcanic Glass (felsic volcanic glass with cristobalite inclusions)
igneous
Yellow-green serpentine (likely)
Serpentine-group phyllosilicate, commonly lizardite or antigorite; approximate formula Mg₃Si₂O₅(OH)₄
mineral
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Sandstone (likely Arkosic or Ferruginous)
Arenite (SiO2 with iron oxides or feldspar)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Muscovite Mica (in Quartz matrix)
Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Oak-grain Laminate (Industrial/Decorative Furniture Finish)
Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)
not a rock (synthetic material)
Aragonite (Yellow/Honey Tumble)
Calcium Carbonate (CaCO3)
mineral
Opalite
Synthetic Opalized Glass
gemstone