Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Category
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Amber
Fossilized Tree Resin (Succinate)
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Sandstone (Micaceous)
Arenite (primarily SiO2 with Phyllosilicates)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
Conglomerate
Clastic sedimentary rock (Conglomerate)
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
Smoky Quartz
Silicon Dioxide (SiO2)
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
Quartz / Common Opal
Silicon Dioxide (SiO2)
Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
Petrified Wood
Silicified Wood (primarily SiO2)
Chalcedony Nodule (Agate/Chert)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Biotite Schist with Garnet
Garnet-Biotite Schist
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Sandstone
Arenite
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
Quartz
Silicon Dioxide (SiO₂)
Agate Geode
Chalcedony (cryptocrystalline SiO2)
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
River Stone (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock (Lithic Wacke / Siltstone)
Quartz Geode
Silicon Dioxide (SiO2) in a concretionary structure
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
Granite
Granite (a felsic intrusive igneous rock)
Magnetite
Magnetite (Fe3O4)
Sandstone (with Lichen)
Arenite (primarily SiO2)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
Sandstone (Quartz Arenite)
Clastic Sedimentary Rock - Quartz Arenite