Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
Category
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
River Rock (Quartzite/Chert)
Quartzite (primarily SiO2)
Chert (Pebble)
Silicon Dioxide (SiO2)
Gabbro
Gabbro
Basalt
Basalt (Mafic Extrusive Igneous Rock)
Basalt
Basalt (Volcanic Mafic Rock)
Basalt
Extrusive Mafic Igneous Rock
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
Basalt River Cobble
Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)
Basalt with Porphyritic Texture
Porphyritic Basalt
Vesicular Basalt with Siltstone
Mafic Volcanic Rock (Basaltic Composition)
Basalt
Basalt (Mafic volcanic rock)
Basalt
Basalt
Basalt (River Cobble)
Basalt (Mafic Extrusive Igneous Rock)
Basalt
Extrusive mafic igneous rock
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
Quartz Druzy on Basalt
Silicon Dioxide (SiO2) on Mafic Volcanic Rock
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile)
Basalt
Extrusive Igneous Rock
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Schist
Metamorphic rock (Schist)
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
Yellow Quartz or Citrine Geode/Cluster
Silicon Dioxide (SiO2)
Fluorite on Matrix
Calcium Fluoride (CaF2)
Sandstone (Quartz-rich)
Arenite
Basalt Porphyry
Porphyritic Basalt
Gneiss
Gneiss
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
White Marble
Recrystallized Calcite (CaCO3)
Banded Gneiss
Gneiss (High-grade metamorphic rock)
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
Granular Sandstone
Arenite (variable composition, primarily SiO2)
Limestone (Micritic)
Sedimentary rock mainly composed of Calcium Carbonate (CaCO3)
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
Sandstone (Quartzose)
Arenite (SiO2 based typically)
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
Granite
Phaneritic plutonic rock (SiO2 rich)
Basalt (River Rock)
Aphanitic Mafic Igneous Rock