Black Onyx
Onyx (Silicon Dioxide, SiO2)
mineral
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
Learn about Mineral (Processed Metal) in the encyclopedia
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Diamond (in jewelry)
Cubic Carbon (C)
mineral
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
mineral
Pegmatite (Granitic Pegmatite with Quartz and Feldspar)
Intrusive Igneous Rock (Granitic Pegmatite)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Green calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Rainbow aura quartz cluster
Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film
mineral
Blue Goldstone
Aventurine Glass
man-made glass
Serpentinite
Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)
metamorphic
Green Agate
Cryptocrystalline Quartz (SiO2)
mineral
Porphyry
Porphyritic Igneous Rock
igneous
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Greisen
Greisen
Metamorphic
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gold
Aurum (Elemental Gold, Au)
Mineral, Metal (element)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite (Granitic Pegmatite)
Pegmatite (Quartz + Potassium Feldspar + Mica)
igneous
Copper Nugget
Native Copper (Cu)
mineral
Granite Pebble
Granite (plutonic igneous rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase Feldspar)
igneous
Dark igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron disulfide (FeS2)
mineral
Granite / Pegmatite Pebble
Felsic intrusive igneous rock
igneous
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Epidosite
Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Diamond
Carbon (C)
gemstone
Quartzite Cobble
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral