Iron Meteorite
Iron-Nickel Meteorite (primarily composed of kamacite and taenite alloys)
Mineral
Category
Mineral (Processed Alloy)
Browse mineral (processed alloy) specimens identified by the Rock Identifier community.
Vanadinite on Barite
Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Banded Agate Coaster
Silicon Dioxide (SiO2) - Variety Agate / Chalcedony
mineral
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Dyed Blue Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Pink Granite
Phaneritic Plutonic Felsic Igneous Rock (Granite)
igneous
Tumbled and polished quartz crystal points
Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties
mineral
Native Copper (Tumbled Nugget)
Cu (Native Element)
mineral
Beryl (var. Aquamarine/Blue Beryl) in Quartz Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Clear quartz (likely quartz crystal fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Silver (Native Element)
Ag (Native Silver), with minor Copper (Cu)
mineral
Granite
Granitoid (dominated by Quartz and Feldspar)
igneous
Tumbled carnelian (likely chalcedony)
Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gold-bearing Quartz Vein in Mafic Rock
Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)
metamorphic
Blue-dyed magnesite beads (often sold as “turquoise howlite”)
Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Aquamarine
Beryl (Be₃Al₂Si‑₆O₁₈)
mineral
Aquamarine
Beryl (Be₃Al₂Si₆O₁₈)
mineral
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Faceted Quartz (Rock Crystal)
Crystalline Silicon Dioxide (SiO2)
gemstone
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Granite
Granite (Felsic Plutonic Rock)
igneous
Amethyst and clear gemstone ring
Amethyst (purple quartz, SiO₂), likely set with colorless quartz or glass accents
gemstone
Cupronickel Coin
Copper-Nickel Alloy (typically 75% Cu, 25% Ni)
anthropic metallic specimen
Native Copper
Native Copper (Cu)
mineral
Beryl (Variety: Aquamarine/Green Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Blue Impression Jasper beads
Impression jasper (microcrystalline quartz/chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions
gemstone
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded sandstone pebble
Lithic or quartz-rich sandstone; exact composition requires testing
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral