Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Gold and Silver (Metal Components of an Antique Pocket Watch)
Native Gold (Au) and Native Silver (Ag)
mineral
Metallic meteorite fragment (probable stony-iron or iron meteorite)
Undetermined meteoritic Fe–Ni alloy with silicate minerals
meteorite
Blue sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Jasper with Iron Staining
Silicon Dioxide (SiO2) with impurities
sedimentary
Amber Inlay Jewelry
Fossilized Resin (C10H16O)
Organic Gemstone (Biogenic)
Tumbled blue-green stone, likely chrysoprase or dyed chalcedony
Cryptocrystalline quartz (SiO₂), possibly nickel-bearing chrysoprase; exact identification requires testing
gemstone
Faceted Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Beryl
Beryllium Aluminum Silicate (Be3Al2(SiO3)6)
mineral
Sphalerite in quartz gangue
Sphalerite (ZnS), associated with quartz (SiO₂)
mineral
Likely native copper nugget
Native copper (Cu)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Amethyst and clear gemstone ring
Amethyst (purple quartz, SiO₂), likely set with colorless quartz or glass accents
gemstone
Blue Impression Jasper beads
Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions
gemstone
Native copper nugget
Copper (Cu), often with cuprite or copper-oxide surface
mineral
Raw pale-green beryl (likely aquamarine)
Beryl, Be₃Al₂Si₆O₁₈; blue-green variety is aquamarine
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Copper Nugget
Native Copper (Cu)
mineral
Chalcopyrite on Quartz
Copper Iron Sulfide (CuFeS2)
mineral
Botryoidal chrysocolla-rich copper ore
Chrysocolla, hydrated copper phyllosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely with malachite and quartz/gangue
mineral
Iron-stained quartz-bearing rock (likely gold-bearing quartz vein fragment)
Quartz (SiO₂) with iron oxides/hydroxides, possibly limonite/goethite and minor sulfides
mineral
Green aventurine pendant
Quartz variety, SiO₂, colored mainly by fuchsite or other chromium-bearing mica inclusions
mineral
Bismuth
Bismuth (Bi)
mineral
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Likely weathered native copper-bearing rock
Unidentified copper-bearing specimen; native copper (Cu) is possible but cannot be confirmed visually
mineral
Gypsum rosette cluster (desert rose)
Gypsum, calcium sulfate dihydrate (CaSO₄·2H₂O), rosette habit
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Granite (White Granite variant)
Phaneritic Plutonic Rock (High-silica Felsic)
igneous
Gold
Aurum (Au)
Mineral (Metal)
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Popcorn
Zea mays everta (P. Wilson) (Botanical name for the corn variety)
Organic/Biogenic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Likely native copper
Native copper (Cu)
mineral
Native copper
Copper (Cu), commonly with cuprite and malachite alteration
mineral
Molybdenite in Quartz
Molybdenite (MoS2) with Quartz (SiO2)
mineral
Bismuth
Native Bismuth (Bi)
mineral
Gold Nugget
Native Gold (Au)
mineral
Copper ore, likely native copper in a host rock
Native copper (Cu), possibly with cuprite/iron-oxide matrix
mineral
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Yellow calcite cabochon
Calcite (calcium carbonate, CaCO₃), likely honey/yellow calcite
mineral
Polished amethyst-bearing quartz
Quartz, SiO₂; purple coloration from trace iron and irradiation, likely in an amethyst/quartz matrix
mineral