Jasper with Quartz Vein
Microcrystalline quartz (SiO2) with impurities
sedimentary
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Tumbled jasper, likely ocean jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Sandstone
Sedimentary rock composed mainly of quartz sand grains
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Chert (Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Iron-stained quartz-rich rock, possibly goethite-bearing quartz
Quartz (SiO₂) with iron oxides/hydroxides, likely goethite or limonite
mineral
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
mineraloid
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Fossil Sponge / Horn Coral / Crinoid Stem
Phylum Porifera or Cnidaria fossilized in calcium carbonate / silica
fossil
Portable Ceramic Space Heater
Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements
not a rock (synthetic/industrial object)
Sandstone (with Iron Staining)
Arenite
sedimentary
Brown Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Agate (Water-Worn)
Cryptocrystalline quartz (SiO2)
sedimentary
Red Sandstone
Arenite (with iron oxide cement)
sedimentary
Shale
Mudrock / Fissile Shale
sedimentary
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Calcite (Honey Calcite and Agate)
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Sandstone
Clastic sedimentary rock (primarily Quartz)
sedimentary
Weathered iron-rich sandstone or conglomeratic sedimentary cobble
Ferruginous sandstone, possibly polymictic conglomerate
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasperiod Siltstone)
sedimentary
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Polished agate fragment
Chalcedony (microcrystalline quartz, SiO₂), likely brecciated or banded agate
mineral
Sandstone with Quartz Veining
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Sandstone
Arenite
sedimentary
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
mineral (silicate-replaced organic material)