Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (color due to lead)
mineral
Category
Anthropogenic Specimen (Man Made)
Browse anthropogenic specimen (man made) specimens identified by the Rock Identifier community.
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Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper type)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Chert (Yellow Jasper/Flint)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Probable amber fragment
Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)
gemstone
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
mineral
Greenstone / serpentinite carving
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing
metamorphic
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Slag
Anthropogenic Vitreous Silicate / Ferro-silicate Slag
igneous
Sandstone (Pebble)
Arenite
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Polished blue stone, likely sodalite or dyed agate
Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing
mineral
Diamond (Cut Gemstone)
Natural Carbon (C)
gemstone
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Slag (Industrial Glass)
Anthropogenic Vitreous Slag (Post-industrial byproduct)
igneous
Chalky limestone
Micritic calcite (CaCO₃), likely biogenic limestone/chalk
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Diamond
Carbon (C)
gemstone
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil