Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Turquoise ring stone (likely stabilized or dyed turquoise)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Bituminous Coal
Organic Sedimentary Rock (Carbon-based)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chert (specifically Gray/Blue-Gray Chert)
Chert (SiO2)
sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Iron Oxide)
sedimentary
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone (Quartz Arenite)
Clastic Sedimentary Rock - Quartz Arenite
sedimentary
Mica Schist (with Garnet)
Garnet-Mica Schist
metamorphic
Chert (Arrowhead Debitage or Spall)
Silicon Dioxide (SiO₂)
sedimentary
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Kaolin Clay in Saprolite Profile
Kaolinite (Al2Si2O5(OH)4) within Weathered Pegmatite/Granite
sedimentary
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Chert (Black Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Polished septarian nodule
Septarian calcite–aragonite nodule, commonly with chalcedony and iron-oxide minerals
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Chalcedony (Moonstone variant or White Agate)
Silicon Dioxide (SiO₂)
mineral
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Black Kyanite
Kyanite (Al2SiO5) with carbonaceous inclusions
mineral
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Fossil fish slab
Fossilized fish remains, likely a laminated shale-hosted vertebrate fossil; exact taxon is indeterminate from the image
fossil
Magnetite
Magnetite (Fe3O4)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Diamond (or Diamond Simulant)
C (Carbon) or synthetic equivalent
gemstone
Red Sandstone
Arenite (with Iron Oxide)
sedimentary