Bismuth Crystal
Bismuth (element symbol Bi, atomic number 83)
mineral
Category
Mineral Based Alloy (Anthropogenic)
Browse mineral based alloy (anthropogenic) specimens identified by the Rock Identifier community.
Learn about Mineral Based Alloy (Anthropogenic) in the encyclopedia
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Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Pebble
Lithic fragment / Weathered rock fragment
sedimentary
Chert
Chert (SiO2)
sedimentary
Schist
Schist (Crystalline Metamorphic Rock)
metamorphic
Bumblebee Jasper
Calcite with Arsenic and Sulfur inclusions
sedimentary
Likely raw galena-bearing ore
Galena (PbS), possibly associated with dark sphalerite or matrix minerals
mineral
Native copper (probable copper-rich mineral specimen)
Copper, Cu; possibly mixed with cuprite, malachite, and iron-oxide alteration minerals
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Garnet
Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)
Mineral
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy)
meteorite
Iron Meteorite
Siderite (Iron-Nickel alloy)
meteorite
Iron Meteorite
Siderite (Iron-Nickel alloy)
meteorite
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Bronzite
Enstatite (magnesium iron silicate), (Mg,Fe2+)SiO3
mineral
Black Tourmaline (Schorl)
Schorl (Sodium iron silicate hydroxide boron silicate); NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Blue Chalcedony
Chalcedony (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Small brown-gray mineral fragment
Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock
mineral
Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Sandstone with Iron Staining
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Native Copper
Native Copper (Cu)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Gold Nugget
Native Gold (Au)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Hag Stone
Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes
sedimentary
Weathered iron-rich stone, possibly limonite-bearing rock
Limonite/goethite mixture (hydrated iron oxides), identification uncertain from image
mineral
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary
Peach Aventurine
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Red Sandstone
Arenite
sedimentary
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic