Scoria
Scoria (vesicular volcanic rock)
igneous
Category
Industrial By Product
Browse industrial by product specimens identified by the Rock Identifier community.
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Bog Iron (Limonite)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
sedimentary
Basalt
Extrusive mafic igneous rock
igneous
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Rough Diamond
Natural Diamond (Carbon, C)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Diamond in Kimberlite
Kimberlite Matrix with Carbon (Diamond)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Bituminous Coal
Coal (Sedimentary Rock)
sedimentary
Iron Meteorite (Oxidized)
Iron-Nickel Alloy (Fe, Ni)
meteorite
Bog Iron (Limonite Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)
mineral
Talc (Soapstone variety)
Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2
mineral
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Coal (Anthracite or Bituminous)
Carbonaceous sedimentary rock (Carbon)
sedimentary
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Bituminous Coal
Bituminous coal (Carbonaceous sedimentary rock)
sedimentary
Rounded river pebble
Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock
sedimentary
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Orange fire opal jewelry
Precious opal, hydrated amorphous silica (SiO₂·nH₂O)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Corundum (Sapphire / Raw Sapphire)
Aluminum Oxide (Al2O3)
gemstone
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Quartz with Tourmaline
Silicon Dioxide with Schorl (SiO2 + NaFe3Al6(Si6O18)(BO3)3(OH)4)
mineral
Gold Nugget
Gold (Au)
mineral
Sandstone (Pebble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Quartz and Iron Oxide
Quartz (Silicon Dioxide, SiO2) with possible Limonite/Hematite inclusions
mineral
Quartzite River Stone
Quartzite (SiO2)
metamorphic
Greenschist
Chlorite schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Soapstone (Steatite) and Quartz mix
Steatite (Mg3Si4O10(OH)2) and Quartz (SiO2)
metamorphic