Granite
Granite
igneous
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
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Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Rounded gray metamorphic rock, likely quartzite or gneiss
Quartz-rich metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Vesicular Basalt (or Rhyolite)
Extrusive Igneous Rock with Vesicular Texture
igneous
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Sandstone
Arenite
sedimentary
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
metamorphic
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Shale
Shale (Lutite)
sedimentary
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Pink Quartzite
Quartzite (SiO2 with minor iron oxide impurities)
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Vesicular Basalt (Pumice-like)
Vesicular Basalt
igneous
Granodiorite
Granodiorite
igneous
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Quartz geode
Crystalline quartz, silicon dioxide (SiO₂), lining a volcanic geode
mineral
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Quartz-veined Basalt or Limestone Pebble
Quartz vein in host rock (Silicate mineral in carbonate or volcanic matrix)
sedimentary
River Pebble (likely Quartzite or Chert)
Sedimentary Clast (Silicon Dioxide dominant)
sedimentary
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Unakite
Unakite (altered granite containing Epidote, Orthoclase, and Quartz)
metamorphic
Basalt (with Iron Staining)
Mafic Igneous Rock
igneous
Peridotite
Ultramafic intrusive igneous rock
igneous
Quartz Pebble (with Iron Staining)
Crystalline Silicon Dioxide (SiO2)
mineral
Schist
Schist (metamorphic rock)
metamorphic
Pahoehoe Basalt
Extrusive mafic volcanic rock
igneous
Granite
Intrusive igneous rock
igneous
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Mixed River Pebbles (including Unakite and Jasper)
Polymineralic geological specimens
igneous and sedimentary