Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Schist with Quartz/Mica
Mica Schist (primarily Muscovite and Quartz)
Metamorphic
Granite
Granite (a plutonic igneous rock)
Igneous
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Red Jasper
Jasper (a variety of Chalcedony, SiO₂)
Mineraloid (cryptocrystalline quartz)
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Petrified Wood
Silicified Wood (SiO2)
Mineral / Fossil
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Granite (Alkali-feldspar Granite)
Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)
igneous
Quartz
Quartz (SiO2)
Mineral
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Ocean Jasper
Silicon Dioxide (SiO2)
Mineral_variety_of_Chalcedony
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (White/Light Tan)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Granite
Phaneritic intrusive igneous rock (Composition: Quartz, Feldspar, Mica)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Black Obsidian
Volcanic Glass (predominantly SiO2, Silicon Dioxide)
igneous
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Mineral
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Red Jasper or Chert
Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Granite Cobble
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Quartz (Float/Abraded)
Quartz (SiO₂)
Mineral
Quartz (Commonly referred to as a River Rock or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral/metamorphic
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral