Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Red Sandstone (with possible iron oxide staining)
Sandstone (primarily Quartz with Hematite/Goethite cement)
sedimentary
Dragon Blood Jasper
SiO2
mineral
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
mineral
Moss Agate with Jasper
Chalcedony (SiO2 with inclusions)
mineral
Basalt with Quartz Veining
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Basalt
Basalt
Igneous
Eroded Limestone with Iron Staining
Carbonate Rock (CaCO3)
sedimentary
Shale
Argillaceous Sedimentary Rock
sedimentary
Shale or Mudstone River Pebble
Argillaceous sedimentary rock
sedimentary
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
Jasper
Chalcedony (Microcrystalline Quartz) - SiO2
sedimentary or metamorphic
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Quartzite with Quartz Veins
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock
sedimentary
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
River Pebble (likely Quartzite or Diorite)
Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock
metamorphic
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
sedimentary
Quartzite river stone
Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Unakite
Unakite (altered granitic rock)
metamorphic
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Mineral on Igneous Rock
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
N/A (Non-Geological Specimen)
N/A
Unable to identify - Image contains non-geological items
N/A
Schist
Schist
Metamorphic
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Agate
SiO2
Mineral
Sandstone Concretion
Sedimentary concretion
Sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary