River Pebble (Basalt or Graywacke)
Mafic Igneous Rock (Basalt)
igneous
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Learn about Man Made Rock (Technosol) in the encyclopedia
View all →
Porphyritic Andesite
Andesite (Porphyritic texture)
igneous
Stream-Rounded Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Quartzite (Water-worn Cobble)
Quartzite (Composition: 90%+ SiO2)
metamorphic
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Granite (likely biotite granite or granodiorite)
Coarse-grained plutonic rock composed mainly of quartz, feldspar, and dark mica/amphibole
igneous
Painted Rock
Weathered Sedimentary Rock (Painted)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Basalt (Vesicular)
Mafic Volcanic Rock (rich in Magnesium and Iron)
Igneous
Conglomerate
Clastic Sedimentary Rock
sedimentary
Basalt River Stone
Basalt (Ma-fi-ic Extrusive Igneous Rock)
igneous
Sandstone (River Cobble)
Clastic Sandstone (SiO2 with accessory minerals)
sedimentary
Flint Pebble
Silicon Dioxide (Microcrystalline Quartz / Chert)
sedimentary
Feldspar-rich Quartzite
Meta-arkose (Quartz-Feldspar Quartzite)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomeratic Sandstone
sedimentary
Basalt
Extrusive igneous rock
igneous
Basalt
Extrusive igneous rock
igneous
Porphyry (Rhyolite or Andesite Porphyry)
Porphyritic Igneous Rock
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Basalt
Mafic Igneous Rock (Basalt)
igneous
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
River Stone (likely Andesite or Siltstone)
Intermediate Volcanic Rock / Fine-grained Sedimentary Rock
igneous
Unakite
Epidotized Granite
metamorphic
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Pink Himalayan Salt Rock
Halite (NaCl with trace iron oxide minerals)
mineral
Sandstone with Quartz Sphere
Arenite (SiO2-rich sedimentary rock) with Quartzite/Rose Quartz sphere
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Desert Varnish on Sandstone
Quartz Arenite with Iron-Manganese Oxide Coating
sedimentary
Shale with Iron Staining
Fissile Mudrock (Sedimentary Rock)
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Dark weathered pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; typically plagioclase, pyroxene, and olivine)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (principally Plagioclase Feldspar and Pyroxene)
igneous
Basalt pebble
Basalt
igneous
Basalt River Pebble
Basalt (extrusive volcanic rock)
igneous