Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
sedimentary
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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Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Sandstone (Red Sandstone)
Arenite (predominantly SiO2 with Fe2O3 cement)
sedimentary
Diamond (Green tinted)
Carbon (C) with trace impurities or lattice defects
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary quartz arenite
sedimentary
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Granite (Gneissic / Weathered Pebble)
Felsic intrusive igneous rock (Granite)
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Bauxite
Bauxite (principal ore of aluminum, primarily Al(OH)3)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Quartz Pebble with Hematite Inclusion
Silicon Dioxide (SiO2)
mineral
Tiger’s-eye bead bracelet
Chatoyant quartz, principally quartz (SiO₂) with pseudomorphic fibrous crocidolite/goethite inclusions
gemstone
Sandstone (Quartz-rich)
Arenite
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Pegmatite
Granitic Pegmatite
igneous
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone / Limestone
Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Mica Schist
Mica Schist (contains Muscovite KAl2(AlSi3O10)(OH)2)
metamorphic
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (River Cobble)
Sandstone (composed predominantly of SiO2 - Quartz)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Serpentine
Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4
metamorphic
Mica Schist
Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Thunderegg (Agate or Quartz Geode)
Silica-filled rhyolitic nodule (SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Silicon
Element Si
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary