Diamond-set letter “L” jewelry piece
Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image
gemstone
Category
Antropogenic (Man Made Industrial Byproduct)
Browse antropogenic (man made industrial byproduct) specimens identified by the Rock Identifier community.
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Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Diamond
Diamond (Pure Carbon, C)
mineral
Diamond (Cluster Ring)
Carbon (C)
mineral
Fossilized oyster shell
Bivalvia; likely an oyster (Ostreidae), partly mineralized with calcite
fossil
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
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)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Raw Diamond
Carbon (C)
gemstone
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Polished smoky quartz crystal point
Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Diamond
Natural Diamond (Carbon, C)
gemstone
Rough Diamond
Diamond (pure Carbon, C)
mineral
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Vesicular basalt (likely scoria)
Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix
igneous
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Blue faceted gemstone, likely synthetic sapphire or blue glass
Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually
gemstone
Diamond
C (Native Carbon)
gemstone
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Desert Rose (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Diamond
Carbon (C)
mineral
Vesicular basalt (possibly slag-contaminated)
Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals
igneous
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral