Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Peridotite (Olivine/Peridot)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Diorite
Diorite
igneous
Lapis Lazuli
Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)
rock
Lapis Lazuli
Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)
rock
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Wood Paneling
Engineered Wood / Plywood Paneling
not a rock
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Basalt
Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Granite
Granite (phaneitic intrusive igneous rock)
igneous
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Quartzite (Quartz Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Basalt (River Rock Cobble)
Extrusive mafic igneous rock
igneous
Granite Pebble
Intrusive Igneous Rock (Granite)
igneous
Granite
Granite (composed primarily of Quartz, Plagioclase, Alkali Feldspar, and Biotite/Amphibole)
igneous
Schorl (Black Tourmaline) in Granite
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper Conglomerate
Polymictic Conglomerate (Quartz and Jasper clasts in a quartz-rich matrix)
sedimentary
Moldavite
Tektite (Silica Glass - SiO2 + Al2O3, FeO, MgO, CaO, Na2O, K2O)
gemstone
Yellow Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Banded Ironstone / Jasper Siltstone
Siltstone with Iron Oxide Hydrates (SiO2 with Fe2O3/FeO(OH))
sedimentary
Desert Rose (Barite Rose or Gypsum Rose)
Barium Sulfate (BaSO4) / Hydrated Calcium Sulfate (CaSO4·2H2O)
mineral
Granite Pebble
Granite
igneous
Quartz Pebble (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble (or Quartz Pebble)
Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble (Microcrystalline Quartz / Chert)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Basalt (River Pebble)
Basalt
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (SiO2 rich)
sedimentary
Red Jasper (or Banded Jasper)
Silicon Dioxide (SiO2 with Hematite impurities)
mineral
Quartzite (or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
metamorphic
Potassium Feldspar (Microcline / Orthoclase)
KAlSi3O8
mineral