Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
Browse igneous or metamorphic (base stone); anthropogenic (decoration) specimens identified by the Rock Identifier community.
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Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Basalt (Beach Pebble)
Extrusive mafic volcanic rock
igneous
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Andesite
Andesite (contains Plagioclase feldspar, Pyroxene, Hornblende)
igneous
Basalt Porphyry
Porphyritic Basalt
igneous
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic
Quartz Vein in Matrix / Quartzite
Silicon Dioxide (SiO2) with host rock
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Slag Glass
Anthropogenic Amorphous Silicon Dioxide
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Smelter Slag
Anthropogenic Silicate Slag
igneous
Basalt River Pebble
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Basalt and Quartz pebbles
Basalt (extrusive igneous rock) and Quartz (SiO2)
igneous and mineral
Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Basalt Pebble
Basalt
igneous
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Painted Garden Rock
Coated Siltstone or Mudstone
sedimentary
River Rock (likely Gneiss or Quartzite)
Metamorphic rock specimen (potentially Foliated Gneiss)
metamorphic
Chert (Arrowhead or Flake)
Microcrystalline quartz (SiO2)
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous
Porphyritic Basalt
Porphyritic Basalt (Silicate Rock)
igneous
Basalt with Amygdaloidal Infilling
Porphyritic or Amygdaloidal Basalt
igneous