Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Category
Industrial Byproduct
Browse industrial byproduct specimens identified by the Rock Identifier community.
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Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
Mineral in Metamorphic/Igneous Host
Chert (Flint)
Chert (SiO2)
sedimentary
Kimberlite
Kimberlite (Porphyritic Peridotite)
Igneous
Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Agate
Agate (Silicon Dioxide - SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Pegmatite
Granitic Pegmatite
igneous
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Fossilized Oyster Shell
Gryphaea or Crassostrea fossil (Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (pure carbon, C)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Chalcedony
Silicon Dioxide (SiO₂)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium/Iron)
mineral
Ruby (Rough/Raw)
Corundum (Al2O3:Cr)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Matrix
Quartz (Silicon Dioxide, SiO2)
mineral
Olivine (Peridot)
Olivine (Magnesium Iron Silicate, (Mg,Fe)2SiO4)
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with natural radiation induced color centers
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Silver (Native Element)
Silver (Ag) in an alloy of 90% Silver and 10% Copper
mineral
Chert (often called Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Red Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Diamond
Carbon (C)
mineral
Vesicular Basalt (commonly mistaken for Slag)
Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)
igneous
Copper
Native Copper (Cu)
mineral
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Bituminous Coal
Bituminous coal (Lithotype: Durain/Clarain)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite
Granite
igneous
Basalt
Basalt
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary