Unidentified small rocks or gravel
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Quartz Druzy
Crystalline Silicon Dioxide (SiO2)
mineral
River Stone (Sandstone with Oxide Banding)
Arenite with Iron/Manganese Oxide inclusions
sedimentary
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Chalcedony / Agate Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Granite Pebble
Felsic Igneous Rock (Granitic composition)
igneous
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Conglomerate (with Jasper pebble)
Conglomerate / Microcrystalline Quartz (Jasper)
sedimentary
Chalcedony Geode Fragment
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Pink Granite
Granitoid (rich in Potassium Feldspar)
igneous
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Chert (Iron-Stained)
Microcrystalline Silica (SiO2)
sedimentary
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Granite Gneiss
Granitic Gneiss
Metamorphic
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Igneous or Sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Note: No specimen visible
N/A
River Stone (Basalt or Siltstone)
Mafic Volcanic Rock or Clastic Sedimentary Rock
igneous or sedimentary
Granite
Felsic intrusive igneous rock
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Basalt with Quartz Veins
Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Sandstone (Banded Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Basalt
Basalt
igneous
Basalt
Basalt (Aphanitic Mafic Igneous)
igneous
Quartzite River Rock
Metamorphic Rock (Quartzite)
metamorphic