Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Category
Not A Natural Rock (Man Made Composite)
Browse not a natural rock (man made composite) specimens identified by the Rock Identifier community.
Learn about Not A Natural Rock (Man Made Composite) in the encyclopedia
View all →
Banded Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Basalt (Vesicular)
Vesicular Basalt
igneous
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Grey River Pebble (Greywacke / Basalt)
Stream-rounded silicate rock pebble
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
mineral
Chert (River Siltstone/Quartzite type)
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid Fossil Stem Segment
Class Crinoidea (Echinodermata)
sedimentary
Chert (Black Flint)
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Shale with Iron Staining
Fissile Argillaceous Sedimentary Rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
mineral
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Amethyst (Tumbled Cabinet Stone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Granite
Granite (Silicic Intrusive Igneous Rock)
Igneous
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Granite
Felsic intrusive igneous rock
igneous