Sandstone (Ferruginous)
Arenite (with Iron Oxide)
Category
Browse organic (non rock) specimens identified by the Rock Identifier community.
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
Red Sandstone
Arenite (with Iron Oxide cement)
Obsidian
Vitreous volcanic silicate (70-75% SiO2)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (primarily SiO2)
Blue Chalcedony
Silicon Dioxide (SiO2)
River Rock (Basalt)
Aphanitic Basaltic Rock
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Chalcedony (Moonstone-like Agate)
Silicon Dioxide (SiO₂)
Unakite
Unakite (Epidotized Granite)
Basalt (Road Aggregate / Crushed Stone)
Aphanitic Mafic Igneous Rock
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix
Carnelian (Red Agate)
Chalcedony (SiO2 with Iron Oxide impurities)
Quartz Geode
Silicon Dioxide (SiO2)
Unakite
Epidotized Granite
Petoskey Stone
Hexagonaria percarinata
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
Sandstone (Ferruginous)
Arenite (Fe-rich)
Sandstone
Arenite (composed primarily of SiO2)
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Quartzite with Iron Inclusions
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
Quartzite with Chlorite/Epidote
Metamorphosed Quartzite (SiO2)
Jasper
Silicon Dioxide (SiO2) with impurities
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
Sandstone
Arenite (SiO2 based with various cements)
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
Sandstone (Ferruginous)
Arenite (Fe-rich)
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
Red Garnet (Pyrope or Almandine)
Garnet Group (A3B2(SiO4)3)
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Amethyst Geode
Silicon dioxide (SiO2) with iron impurities
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
Milky Quartz
Silicon Dioxide (SiO2)
Banded Agate
Chalcedony (SiO2) with microcrystalline quartz