Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
Browse anthropogenic (man made product subject to geological processes) specimens identified by the Rock Identifier community.
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Unidentified Rock Fragment
Unknown
Rock
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe)
mineral
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Hematite
Hematite (Fe2O3)
mineral
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Quartz
Silicon Dioxide (SiO2)
Mineral
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Blue Chalcedony and Picture Jasper Beads
Blue Chalcedony (SiO2), Picture Jasper (SiO2)
Mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Bituminous Coal
Organic sedimentary rock (humic coal)
sedimentary
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Pink Quartzite
Silica (SiO2) - Metamorphic rock
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Turquoise
Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)
Mineral
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
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N/A
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Red Jasper (Opaque Chalcedony)
Jasper / Silicon Dioxide (SiO2) with Ferric Iron inclusions
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Sandstone (lithified sand)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2 + Fe2O3)
sedimentary
Quartz (Milky/Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Granite
Granite (a common rock type, not a single mineral species)
Igneous