Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Category
Man Made Material (Anthro Lithic Product)
Browse man made material (anthro lithic product) specimens identified by the Rock Identifier community.
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Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Chert (Arrowhead/Tool variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Pumice
Pumice (Volcanic Rock)
igneous
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Coquina or Fossiliferous Sandstone
Fossiliferous Calcarenite (CaCO3 with SiO2 inclusions)
sedimentary
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Quartz-veined Greywacke
Silicon dioxide (SiO2) in Lithic Sandstone
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Pumice
Pumice
igneous
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Chert (Flint Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Chert (Field-collected Arrowhead-shaped Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Red Sandstone (Arkose)
Clastic Sedimentary Rock (Lithic Arkose)
sedimentary
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (Green Jasper)
Microcrystalline Quartz (SiO2) with iron silicate inclusions
sedimentary
Chert (White Variety)
Microcrystalline Silica (SiO2)
sedimentary
Man-made Jewelry (Metal and Glass/Plastic)
Synthetic Alloy and Amorphous Solid (SiO2/Polymer)
not a rock
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Tumbled dark stone, likely basalt or basaltic rock
Fine-grained mafic volcanic rock; commonly basalt, composed chiefly of plagioclase and pyroxene with possible olivine and iron oxides
igneous
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Likely iron-rich slag or weathered ironstone
Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag
mineral
Chert (Brown Variety)
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (Volcanic Rock / Glass Froth)
igneous
Red Sandstone
Sandstone (lithic arenite / ferruginous sandstone)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Red jasper (tumbled)
Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides
mineral