Milky Quartz (polished heart)
Quartz (Silicon Dioxide, SiO2)
Category
Browse sedimentary rock (technically a variety of chalcedony) specimens identified by the Rock Identifier community.
Milky Quartz (polished heart)
Quartz (Silicon Dioxide, SiO2)
Milky Quartz (with Iron Oxide staining)
Silicon Dioxide (SiO2)
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Jasper (Red/Green Brecciated)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Blue Chalcedony
Chalcedony (cryptocrystalline Silicon Dioxide - SiO2)
Rose Quartz
Silicon Dioxide (SiO2)
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Herkimer Diamond
Quartz (Silica - SiO2)
Pyrite in Shale
Iron Disulfide (FeS2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
Milky Quartz
Milky Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Satin Spar
Fibrous Gypsum (CaSO4·2H2O)
Milky Quartz
Silicon Dioxide (SiO2)
Chert (and/or Chalcedony)
Silicon dioxide (SiO2)
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
Snowflake Obsidian
Vitreous volcanic silicate rock (SiO2) with Spherulite inclusions
Fish Fossil in Limestone
Lycoptera (likely) in Micritic Limestone
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Granodiorite
Granodiorite (Intermediate to Felsic Intrusive Rock)
Petrified Wood
Silicified wood (primarily SiO2)
Sandstone (Quartzite-rich)
Clastic sedimentary rock (SiO2 primary)
Petrified Wood
Silicified Wood (SiO2)
Sandstone Concretion
Sedimentary concretion
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO₂)
Milky Quartz
Silicon Dioxide (SiO2)
Chalcedony (Agate/Carnelian type)
Silicon Dioxide (SiO2)
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Tumbled Stone Collection (featuring Tiger's Eye, Rose Quartz, and Moss Agate)
Mixed Silicates and Oxides (predominantly SiO2 group minerals)