Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Granite
Granite (Phaneritic igneous rock)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Sandstone (likely Arkose or Lithic)
Clastic sedimentary rock (SiO2 + impurities)
sedimentary
Chert (Jasper-like Siliceous Rock)
Chert (Silicon Dioxide, SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Basalt
Basalt (principally Plagioclase and Pyroxene)
igneous
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Veined Limestone (or Quartz-Veined Slate/Shale)
Metamorphosed Sedimentary Rock with Calcite/Quartz Veins
metamorphic
Basalt
Basalt
igneous
Basalt River Pebble
Basalt
igneous
Basalt with Scoria and potential Olivine/Pyroxene inclusions
Vesicular Basalt
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Basalt River Stone
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Basalt (Stream-worn Cobble)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Quartzite Pebble
Quartzite (SiO2 silicon dioxide)
metamorphic
Sandstone
Arenite (SiO2 principal component)
sedimentary
Diorite (Salt and Pepper Rock)
Diorite
igneous
Quartz Vein Quartzite Pebble
Quartzite with Quartz Veining
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Brown Jasper / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Metamorphic Gneiss
metamorphic
River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
River Pebble (Grey Quartzite / Sandstone Gravel)
Quartz-rich Sedimentary / Metamorphic River Pebble
sedimentary
River Cobble (Quartzite / Sandstone)
Quartzite / Siliciclastic Sedimentary Rock
sedimentary
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Rhyolite (Porphyritic / Vesicular)
Rhyolite
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
River Pebble (Granite / Sandstone Cobble)
Stream-rounded Rock Pebble
sedimentary
Chert (Flint / Agate Nodule)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Granitic Gneiss
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Pyrite in Slate
Iron Sulfide (FeS2) in Slate host matrix
metamorphic
Red Jasper or Ferruginous Chert
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Beach Pebble (Gabbro or Basalt Porphyry)
Mafic Igneous Rock (Porphyritic Basalt / Gabbro)
igneous
River Cobble / Basalt Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous