Efflorescence (on Clay Brick)
Crystalline salt deposits (typically Sodium Sulfate Na2SO4, Calcium Carbonate CaCO3, or Potassium Sulfate K2SO4)
Mineral precipitate (anthropogenic context)
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia
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Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Slag Glass / Industrial Slag
Anthropogenic Glass
man-made glass / industrial byproduct
Chert / Flint Handaxe
Cryptocrystalline Quartz (SiO2)
sedimentary
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Chert (Arrowhead Fragment)
Silicon Dioxide (SiO2)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Chert (Arrowhead/Projectile Point)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Metal Chain (Likely Steel or a Steel Alloy)
Steel (primarily iron and carbon); specific alloy unknown
Man-made Object (Metal/Alloy)
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Ferruginous Sandstone
Ferruginous Sandstone (Quartz Arenite with Iron Oxide cement)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly weathered chert
mineral
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Concrete
Anthropogenic Conglomerate
sedimentary
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Ferruginous Sandstone (Gritstone)
Clastic sedimentary rock with iron-rich cement (FeO(OH)·nH2O)
sedimentary
Copper (native copper)
Native copper, Cu
mineral
Unidentified small brown rock
Undetermined; image does not show enough detail for reliable identification
sedimentary
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Unknown Rock Fragment
Unknown
unknown
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Chert (flint) fragment
Microcrystalline quartz (SiO₂), commonly called chert; “flint” is a variety of chert
sedimentary
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Polished rose quartz
Quartz (silicon dioxide, SiO₂), rose-colored variety
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Smelter Slag
Anthropogenic Silicate Slag
igneous
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Weathered stone nodule or concretion
Unidentified lithic concretion; composition cannot be determined from the image
sedimentary