Mineral, Sediment

Browse mineral, sediment specimens identified by the Rock Identifier community.

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

sedimentary

Hag Stone

Siltstone or Fine-grained Sandstone with boring (e.g., Lithophaga impact)

sedimentary

Red Jasper

Jasper (SiO2 with Fe2O3 inclusions)

sedimentary

Conglomerate

Conglomerate (Clastic sedimentary rock)

sedimentary

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Mineral

Jasper

Chalcedony (cryptocrystalline quartz), SiO2

Sedimentary

Sandstone

Arenite (a specific type of sandstone with less than 15% matrix)

Sedimentary rock

Picture Jasper

Silicon Dioxide (SiO2)

sedimentary

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

sedimentary

Ironstone Pebble

Ferruginous sedimentary rock (Fe2O3 / FeO(OH) mixed with SiO2)

sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

sedimentary

Jasper

Jasper (Cryptocrystalline variety of Quartz, SiO2)

sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

sedimentary

Crinoid Stem Fragment

Crinoid (Phylum Echinodermata, Class Crinoidea)

sedimentary

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

sedimentary

Red Jasper (nodule)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary

Chalk

Calcium Carbonate (CaCO3)

sedimentary

Jasper (Mookaite style)

Silicon Dioxide (SiO2) with iron and manganese inclusions

sedimentary

Jasper (Red/Brown Variety)

Jasper (Microcrystalline Quartz, SiO2)

sedimentary

Red Jasper

Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron Oxide)

sedimentary

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Fuchsite Gneiss (Green Quartzite)

Chromium-rich Muscovite (KAl2(AlSi3O10)(OH)2 with Cr replacements)

metamorphic

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

sedimentary

Red Jasper (possibly Chert/Argillite)

Jasper (SiO2) with iron oxide inclusions

sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Sedimentary rock (specifically a concretion or possibly a geode)