Diorite
Diorite (Plagioclase feldspar and amphibole/biotite)
igneous
Category
Anthropogenic Sedimentary (Man Made)
Browse anthropogenic sedimentary (man made) specimens identified by the Rock Identifier community.
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Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Marble
Metamorphic Limestone (CaCO3)
metamorphic
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Natural Pearl (appearing in a jewelry setting)
Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Pink Granite
Intrusive Igneous Rock (high K-feldspar content)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diamond
Native Carbon (C)
mineral
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone
Blue calcite sphere
Calcite (CaCO₃), commonly blue-calcite variety
mineral
Pearl-and-gemstone insect brooch
Pearl: nacre (aragonite, CaCO₃); colored stones are likely synthetic or natural corundum/spinel/glass, not determinable from the image
gemstone
Smoky Quartz
Silicon Dioxide (SiO2) with trace aluminum and irradiation
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Petoskey Stone
Favosites alpenensis
fossil
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Diamond
Carbon (C)
gemstone
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Raw Diamond
Carbon (C)
gemstone
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Mother of Pearl (Nacre)
Calcium Carbonate (Aragonite) with organic conchiolin
gemstone
Diamond
Carbon (C)
gemstone
Blue Chalcedony
Chalcedony (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Nacre (Mother of Pearl)
Nacre (Biogenic Aragonite/Calcite composite, CaCO3)
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral