Basalt
Basalt
Igneous
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Basalt
Basalt
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Chert (Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Obsidian (likely snowflake-free black volcanic glass)
Volcanic glass; predominantly rhyolitic silica melt (SiO₂-rich, noncrystalline)
igneous
Green Quartzite (with Fuchsite)
Quartzite with Muscovite variety Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartz on Greenstone
Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit
metamorphic
Conglomerate
Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)
sedimentary
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Quartzose Sandstone / Lithic Sandstone
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary
Diamond (or Cubic Zirconia)
Cubic Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Greenstone (Epidosite or Serpentinite)
Metabasalt / Epidote-Chlorite Schist
metamorphic
Chert (Field Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Laterite
Laterite (Ferricrete)
sedimentary
Siltstone (Yellow/Brown Sandstone or Siltstone)
Siltstone / Fine-grained Sandstone (rich in iron oxides like limonite)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Blue Quartzite (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebbeckite
metamorphic
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished green aventurine
Quartzite dominated by quartz (SiO₂), colored by fuchsite mica and/or iron-bearing inclusions
mineral
Agate (Grey Agate Slice)
Microcrystalline Quartz (SiO2)
mineral
Chert (containing Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive)
igneous
Pumice
Pumice (Felsic volcanic rock)
igneous
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Basalt
Africite (Mafic Igneous Rock)
igneous
Greenstone
Metabasalt (Greenstone Facies)
metamorphic
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Jasper Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron Oxide Impurities
sedimentary