Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Rock Like Material) in the encyclopedia
View all →
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Natural turquoise-bearing rock
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a limonite or host-rock matrix
mineral
Serpentinite
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Small brown mineral fragment, possibly quartz/chert
Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Granodiorite
Granodiorite (Na,Ca)(Al,Si)4O8
igneous
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Diamond and Sapphire
Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)
gemstone
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Coal (Bituminous / Anthracite)
Carbonaceous Sedimentary Rock (C)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral/igneous
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Possible fossilized bone or tooth fragment
Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate
fossil
Asphalt Chunk
Asphalt concrete
man-made composite
Schist
Mica Schist
metamorphic
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Schist
Mica Schist
metamorphic
Quartz geode (likely amethyst-bearing)
Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides
mineral
Schist
Schist (variety likely Mica Schist)
metamorphic
Basalt
Basalt
igneous
Serpentine-rich serpentinite
Serpentinite, chiefly lizardite–chrysotile–antigorite Mg₃Si₂O₅(OH)₄, possibly with calcite and talc
metamorphic
Yellow Jade (Quartzite Jade)
Quartzite (SiO2)
gemstone
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Serpentine
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Sandstone
Arenite
sedimentary
Wavellite with Quartz
Al3(PO4)2(OH,F)3 & SiO2
mineral