Sandstone or Limestone
Sedimentary Rock
Sedimentary
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
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Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Granite or Pegmatite in host rock
Granitoid / Felsic Intrusive Rock
Igneous
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Colorless faceted gemstone (most likely synthetic cubic zirconia)
Cubic zirconia, ZrO₂ (likely synthetic); natural alternatives include quartz or diamond
gemstone
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Granite Cobble
Granite
igneous
Red Sandstone
Sandstone (principally Quartz, SiO2, with Iron Oxide hematite cement)
sedimentary
Red Sandstone
Sandstone (hematitic/iron-rich quartzite or arenite)
sedimentary
Rutilated Quartz
SiO2 with TiO2 inclusions (Rutile)
Mineral
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Sandstone
Arenite
sedimentary
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Quartz Pebble with Drusy/Crystalline Pocket
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 with various cementing minerals)
sedimentary
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
sedimentary
Dalmatian Stone
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Lapis Lazuli
Complex mixture of minerals, primarily Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Concrete
Anthropogenic Conglomerate
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
River-worn Chert
Microcrystalline Quartz (SiO2)
sedimentary
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Conglomerate
Conglomerate Rock
sedimentary
River cobble (Greywacke/Sandstone)
Sandstone / Greywacke
sedimentary
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber