Red sandstone pebble
Quartz-rich sandstone, commonly ferruginous sandstone (SiO₂-dominated)
sedimentary
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Aura Quartz (Coated Quartz)
Silicon Dioxide (SiO2) treated with metallic vapor
mineral
Limestone (specifically a Crushed Aggregate fragment)
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sphalerite
(Zn,Fe)S
mineral
Dyed mineral cluster, likely calcite or aragonite
Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced
mineral
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Limonite/Goethite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Hematite Ball
Iron(III) oxide (Fe2O3)
mineral
Shale
Argillaceous sedimentary rock
sedimentary
Blue Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Celestite
Strontium Sulfate (SrSO4)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Dyed agate geode slice
Banded chalcedony (microcrystalline SiO₂), commonly sold as a dyed agate slice
mineral
Coal
Carbonaceous sedimentary rock / Lignite to Bituminous coal
sedimentary
Blue aventurine quartz (likely dyed or tumbled quartzite)
Quartz, silicon dioxide (SiO₂), with blue coloration from inclusions or dye
mineral
Red chalcedony (likely dyed or heat-treated)
Microcrystalline quartz, SiO₂; possibly red agate/carnelian
mineral
Red Tiger's Eye
Pseudomorph of Macrocrystalline Quartz after Crocidolite (SiO2)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Dyed agate slice
Microcrystalline quartz (SiO₂), typically banded chalcedony
mineral
Dyed tumbled quartz (likely quartzite or quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Dyed tumbled stone, likely chalcedony or quartz
Microcrystalline quartz (SiO₂), probably dyed magenta
mineral