Diamond
Native Carbon (C)
mineral
Category
Not A Rock (Man Made Industrial Metal)
Browse not a rock (man made industrial metal) specimens identified by the Rock Identifier community.
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Man-made Crystal (Lead Glass)
Lead oxide-doped Silica Glass (approx. SiO2 + PbO)
Mineraloid/Synthetic Material
Granite
Granite
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sphalerite in Chalcedony (Crescent Carving)
Zinc Sulfide (ZnS) with Silicon Dioxide (SiO2)
mineral
Quartzite pebble
Meta-quartzite (SiO2)
metamorphic
Greenstone
Greenschist (composed of actinolite, chlorite, and epidote)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Native Copper (Penny specimen)
Native Copper (Cu)
mineral
Silver (Native or Alloyed)
Ag (Argentum)
mineral
Diamond
Carbon (C)
gemstone
Cubic Zirconia (as a jewelry specimen)
Zirconium dioxide (ZrO2)
mineral
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Rough Diamond
Native Carbon (C)
mineral
Granite and Porphyry Pebbles
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Rainbow aura quartz cluster
Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Fossiliferous limestone (likely ammonite/gastropod-bearing)
Bioclastic limestone; predominantly calcite (CaCO₃)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
South Korean 100 Won Coin (Cupronickel)
Cupronickel Alloy (75% Cu, 25% Ni)
mineral-based alloy (anthropogenic)
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Serpentine
Antigorite/Chrysotile/Lizardite mixture (Mg,Fe)3Si2O5(OH)4
metamorphic
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Diamond jewelry
Diamond (crystalline carbon, C)
gemstone
Silver (Native Silver/Alloy Specimen)
Ag (Native Silver element), specifically a 90% Ag / 10% Cu alloy
mineral
Milky Quartz with Iron Oxide Weathering
Silicon Dioxide (SiO2) with Goethite/Limonite coatings
mineral
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Porphyritic Basalt
Porphyritic Basalt (with Plagioclase phenocrysts)
igneous
White Quartzite
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic