Kaolinite (Chalky Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
mineral
Anthracite Coal
High-rank coal (primarily Carbon, C)
metamorphic
Chalcedony
Silicon Dioxide (SiO₂)
mineral
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Chert / Flint Nodules in Limestone
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Red Chert
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (Gerrit)
Arenite with Iron Oxide cementation
sedimentary
Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich concretion or possible meteorite
Likely limonite/goethite concretion; meteorite status unconfirmed
mineral
Quartz with Iron Oxide Staining
SiO2
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
Mineral
Chert (specifically Jasper/Brown Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (or Agate/Quartzite)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Blue turquoise cabochon
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; likely dyed or stabilized, flower-shaped polished piece
gemstone
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Laterite (Iron-rich bauxite or Gossan)
Ferricrete (Fe2O3·nH2O)
sedimentary
Chert (Gravel pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Weathered Sedimentary Rock
Sedimentary Rock
Sedimentary
Jasper (Multi-colored) / Sea Glass Slag
Silicon Dioxide (SiO2) with impurities of Iron Oxide
Sedimentary (if natural Jasper) or Artificial (if Slag)
Tumbled quartz-rich stone, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Iron Ore (Goethite and Hematite)
Iron Oxyhydroxide (α-FeO(OH)) and Iron(III) oxide (Fe2O3)
sedimentary
Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Grey Chalcedony (Tumbled Moon)
Microcrystalline Quartz (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Greywacke (River Pebble)
Greywacke sandstone with quartz veining
sedimentary
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral