Quartz
Silicon Dioxide (SiO2)
Mineral
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Diamond (Cluster Ring)
Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Diamond
Native Carbon (C)
mineral
Diamond
Carbon (C)
mineral
Amethyst
SiO2 (Silicon Dioxide) - a variety of Quartz
Mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Diamond
Diamond (Pure Carbon, C)
mineral
Sandstone
Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)
Sedimentary Rock
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mica Schist
Foliated Metamorphic Rock (rich in Muscovite or Biotite)
metamorphic
Greenschist (Greenstone)
Greenschist (Metamorphic rock containing chlorite, actinolite, and epidote)
metamorphic
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Granite (with Almandine Garnet inclusions)
Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Rough Diamond
Pure Carbon (C)
mineral
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Chert (and Jasper/Chalcedony mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Rough Diamond
Diamond (pure Carbon, C)
mineral
Raw green aventurine (likely quartzite)
Quartz-rich quartzite, chiefly microcrystalline SiO₂ with green mica/fuchsite or chlorite
metamorphic
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Tumbled chalcedony (likely blue-gray agate)
Cryptocrystalline quartz, SiO₂; chalcedony/agate variety
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (in jewelry setting)
Carbon (C)
mineral
Pearl
Aragonite (CaCO3) with Conchiolin
mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary