Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
Category
Browse mineral based human made alloy specimens identified by the Rock Identifier community.
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
Sandstone
Arenite (SiO2 primarily)
Angel Aura Quartz (Treated Clear Quartz)
Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
Gold bullion bars
Native gold (Au), likely cast or refined metal
Gemstone ring (stones not reliably identifiable from the image)
Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually
Polished smoky quartz crystal point
Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions
Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
Coal (Anthracite / Bituminous)
Organic Sedimentary Rock (Carbon-based)
Faceted brown gemstone pendant, likely smoky quartz or champagne topaz
Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)
Green sea glass or tumbled green quartz (uncertain)
Likely quartz (SiO₂) if natural; alternatively man-made soda-lime glass
Small metallic-looking mineral/rock fragment
Indeterminate from image; possibly galena, hematite, or metallic slag
Small dark rock fragment
Uncertain; possibly weathered basalt or slag
Sea Glass
Man-made vitreous material (silica-based glass)
Tumbled greenish chalcedony or serpentine pebble
Likely microcrystalline quartz (chalcedony, SiO₂) or serpentine-group mineral; exact identification requires testing
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
Tourmalinated quartz point
Quartz (SiO₂) with black tourmaline (schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄) inclusions
Concrete Fragment
Hardened Portland Cement Composite
Native Copper
Native Copper (Cu)
Polished yellow calcite
Calcite (calcium carbonate, CaCO₃)
Concrete
Hydrated Portland Cement Aggregate Composite
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Polished orbicular jasper (likely ocean jasper)
Siliceous microcrystalline quartz/chalcedony with iron-oxide and volcanic inclusions; commonly called ocean jasper
Green iridescent glass cabochon or synthetic gemstone
Likely synthetic glass; possibly coated synthetic quartz or lab-created green gemstone
Dyed Agate / Painted Stone
Silicon Dioxide (SiO2) with artificial pigment
Dark green cabochon gemstone ring
Unknown; possibly green onyx (cryptocrystalline quartz, SiO₂) or another green gem
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
Opalite
Synthetic Glass (Silica-based)
Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)
Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components
Polished black stone sphere (likely black basalt or black tourmaline)
Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
Molybdenite in Quartz
Molybdenite (MoS2) with Quartz (SiO2)
Chert / Flint
Microcrystalline Quartz (SiO2)
Metal Chain Belt with Square Plates
Not applicable (man-made)
Goldstone
Aventurine Glass (Man-made)
Aragonite (specifically Mexican Marbled Onyx)
Aragonite (Calcium Carbonate, CaCO3)
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
Chert (Flint)
Microcrystalline Quartz (SiO2)