Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Category
Synthetic (Not A Natural Rock)
Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.
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Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Shale
Lutaceous Sedimentary Rock
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone
Arenite/Quartz Arenite
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Likely pale limestone or calcite-rich rock
Calcite-bearing limestone; chiefly calcium carbonate (CaCO₃)
sedimentary
Sandstone (Iron-stained Pebble)
Sandstone (Quartz/Hematite dominated)
sedimentary
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Granite Cobble / Gneiss (River Rock)
Granitic Gneiss / Felsic Igneous Rock
igneous
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartzite Pebble
Quartzite
metamorphic
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 principal component)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Sandstone (Quartz Arenite / Arkose with Hematite cement)
sedimentary
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartz-rich Rock
metamorphic
Pumice
Volcanic glass / Pumiceous rock
igneous
Sandstone
Arenite
sedimentary
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock composite)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Dyed Dalmatian Stone
Aplite (Alkali-feldspar granite) with Arfvedsonite
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous