Eclogite
Eclogite (High-pressure metamorphic rock)
metamorphic
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Polished jasper or chert
Microcrystalline quartz (SiO₂), likely iron-stained jasper/chalcedony
mineral
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Serpentinite
Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Red Sandstone
Sedimentary Arenite / Quartzose Sandstone
sedimentary
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
Granitic Pebble (Glacial Erratic)
Granite
igneous
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Polished unakite pebble
Unakite: epidote–feldspar (commonly pink K-feldspar and green epidote), with quartz
metamorphic
Pink granite (likely weathered granite)
Granite, composed mainly of quartz, feldspar, and mica
igneous
Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Granite
Granite
Igneous
Unakite
Unakite, an epidote-altered granite composed mainly of epidote, pink orthoclase feldspar, and quartz
metamorphic
Granite pebble
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Possible milky quartz vein or nodule
Quartz (SiO₂), provisionally identified from the visible white translucent material
mineral
Druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline-to-fine crystalline drusy quartz
mineral
Likely granite pebble
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Granite
Granite; chiefly quartz, feldspar, and mica or amphibole
igneous
Granite (likely weathered feldspathic granite)
Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole
igneous
Quartz-bearing granite or pegmatitic rock
Granite, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the image
igneous
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
metamorphic
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Igneous or Sedimentary
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
River Stone (Basalt or Siltstone)
Mafic Volcanic Rock or Clastic Sedimentary Rock
igneous or sedimentary
Gabbro
Coarse-grained mafic intrusive igneous rock
igneous
Chert
Microcrystalline quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Gneiss
Gneiss
metamorphic
Gabbro (or Basalt Pebble)
Mafic Intrusive/Extrusive Igneous Rock
igneous
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Fossiliferous Limestone
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Coarse-grained gray metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss (probable)
metamorphic