Banded River Pebble (Gneiss or Quartz-Veined Basalt)
Polished River Siltstone or Quartzite Gneiss
metamorphic
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3
mineral
Rough Diamond
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
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Opalite (Man-made Glass)
Synthetic Opalised Glass
mineral
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Ironstone (possibly Bog Iron or Limonite)
Goethite-rich Ironstone (FeO(OH))
sedimentary
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt
Basalt
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chalk (Sedimentary Limestone)
Calcite (CaCO3)
sedimentary
Coal (Bituminous)
Bituminous Coal (C)
sedimentary
Basalt
Basalt (Ma-Fe Silicate)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (mostly SiO2)
metamorphic
Diabase
Diabase (also known as Dolerite)
igneous
Greywacke
Dirty Sandstone (Lithic wacke)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Bituminous Coal
Humic coal (Carboniferous fossil fuel)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Vesicular Basalt
Basalt (with vesicular texture)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Pumice and Scoria
Vesicular Volcanic Ejecta (Rhyolite/Andesite/Basalt)
igneous