Red Sandstone
Arenite (composed primarily of Quartz and Iron Oxide)
sedimentary
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
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Chondrite Meteorite
Ordinary Chondrite (L or H Type)
Mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Tiger Carving (Banded Onyx or Calcite)
Banded Calcite (CaCO3)
sedimentary
Native Copper
Native Copper (Cu)
mineral
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
Opalite
Synthetic Glass (Silica-based)
gemstone
River Pebble (likely Quartzite or Siltstone)
Sedimentary Clast (SiO2 based)
sedimentary
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Pink Feldspar / Rhodochrosite (Tumbled Pink Quartzite)
SiO2 (Quartz) / KAlSi3O8 (Potassium Feldspar)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Polished gray stone, likely quartzite or river-worn granite
Tentatively quartzite (mostly microcrystalline SiO₂); exact identification is uncertain from the photograph
metamorphic
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Dyed Dalmatian Stone (Dalmatian Jasper)
Aplite (predominantly quartz, feldspar, and arfvedsonite)
igneous
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Moss Agate
Chalcedony (SiO2) with dendritic inclusions of Manganese or Iron oxide
mineral
Megalodon Tooth
Otodus megalodon
fossil
Psilomelane (Manganese Ore)
Psilomelane (Ba,H2O)2Mn5O10
mineral
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Sandstone (likely Graywacke or Lithic Sandstone)
Arenite / Wacke (SiO2 based with lithic fragments)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Banded calcite (onyx marble)
Calcite, CaCO₃; commonly sold as “honey onyx” or “Pakistan onyx”
mineral
Pink Quartz / Sea Glass
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Blue Sapphire
Corundum (Al2O3)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Conglomerate (or Breccia / Porphyry)
Clastic Sedimentary Rock (Conglomerate / Sandstone)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Plioplatecarpus)
fossil
Copper Ore (likely Chalcopyrite in Matrix)
Chalcopyrite (CuFeS2)
mineral
Likely raw chalcopyrite or bornite specimen
Chalcopyrite (CuFeS₂), possibly bornite (Cu₅FeS₄)
mineral
Likely chalcopyrite-bearing sulfide ore
Chalcopyrite (CuFeS₂), possibly with pyrite and/or sphalerite
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary