Diamond
Diamond (C)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
Browse industrial byproduct (anthropogenic rock) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Rock) in the encyclopedia
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Chert (Chert / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Geodal Limestone / Calcite Druze
Calcium Carbonate (CaCO3)
sedimentary
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
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
Sea Glass (Frosted Glass)
Amorphous Silica (SiO2) with various additives
Man-made material (Anthropogenic 'mineraloid')
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Shale (with Iron Staining)
Argillaceous mudstone / Shale
sedimentary
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Fuchsite Quartzite
Fuchsite-bearing Quartzite
Metamorphic
Sandstone
Arenite
sedimentary
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Quartz-veined Sandstone Pebble
Quartzite-veined Arenite
sedimentary
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
metamorphic
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Unakite
Epidotized Granite
metamorphic
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
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Sapphire
Corundum (Al₂O₃) with trace elements causing color variations.
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
Polished red banded stone, likely rhodonite
Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral