Galena
Galena (lead sulfide, PbS), possibly a galena-rich ore specimen
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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Bismuth crystal aggregate
Bismuth (Bi), commonly laboratory-grown
mineral
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Silicon
Element Si
mineral
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Iron meteorite (probable)
Iron–nickel meteorite, mainly kamacite and taenite (Fe–Ni alloy)
meteorite
Concrete fragment or Conglomerate
Artificial Conglomerate (Concrete) or Natural Conglomerate
sedimentary
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2) with artificial cobalt-based dye
mineral
Iron Meteorite (Candidate)
Iron Meteorite (Siderite)
mineral
Copper (native copper)
Native copper, Cu
mineral
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Desert Rose
Selenite Rose (Gypsum: CaSO4·2H2O)
mineral
Gold Nugget
Native Gold (Au)
mineral
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Faceted Peach Morganite (Beryl)
Morganite (Be3Al2Si6O18 with trace Manganese)
mineral
Gold Nugget
Native Gold (Au)
mineral
Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral
Red glassy cabochon, likely synthetic ruby or red glass
Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass
gemstone
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite river stone
Quartzite (SiO2)
metamorphic
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
Sandstone River Pebble
Arenite (SiO2 predominantly)
sedimentary
Amethyst (rough purple quartz)
Quartz, SiO₂; purple color from trace iron and natural irradiation
mineral
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Pink/red faceted gemstone, likely synthetic ruby or pink sapphire
Corundum, aluminum oxide (Al₂O₃); likely lab-grown or treated material
gemstone
Dyed druzy quartz geode
Quartz, silicon dioxide (SiO₂), likely artificially dyed
mineral
Probable weathered sulfide-bearing rock
Indeterminate; possibly pyrite- or chalcopyrite-bearing matrix
mineral
Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Blue cabochon ring stone, likely lapis lazuli or blue chalcedony
Uncertain from image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or cryptocrystalline quartz (SiO₂)
gemstone
Small clear crystal, probably quartz
Quartz (SiO₂), possibly a tiny quartz chip or translucent feldspar fragment
mineral
Likely galena (lead ore)
Galena, PbS (lead sulfide)
mineral
Polished native copper
Native copper (Cu), likely with cuprite/tenorite oxidation products
mineral
Copper-bearing sulfide ore, possibly chalcopyrite-rich
Chalcopyrite (CuFeS₂), possibly with bornite and oxidation products
mineral
Sandstone Clast
Arenite (primarily SiO2)
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Silver (Native Element)
Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen
mineral