Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
mineral
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Kaolin Clay in Saprolite Profile
Kaolinite (Al2Si2O5(OH)4) within Weathered Pegmatite/Granite
sedimentary
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Bauxite
Bauxite (mainly Al(OH)3, AlO(OH))
sedimentary
Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (or Agate/Quartzite)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Sandstone (with cross-bedding)
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Chert (specifically Flint or Novaculite variant)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Mineral
Chert (specifically Flint or Common Opal variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Beryl (likely Pink/Morganite variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Anthracite Coal
High-rank coal (primarily Carbon, C)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Red Sandstone
Arenite (with Iron Oxide pigmentation)
Sedimentary
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary