Sandstone (Ferruginous)
Arenite with Iron-oxide inclusions (SiO2 primarily)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Weathered carbonate rock, possibly fossiliferous limestone
Calcite-rich limestone (CaCO₃), tentative identification
sedimentary
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Desert Rose
Gypsum (CaSO4·2H2O) or Baryte (BaSO4) with trapped sand grains
mineral
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Chalcedony (Agate / Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Gray Slate Pebble
Slate (metamorphosed mudstone/shale)
metamorphic
Unakite
Unakite; epidote–pink feldspar–quartz rock
metamorphic
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Chalcedony (Common Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Cockle Shell Fossil
Cardium (Bivalvia)
fossil
Quartz
SiO2 (Silicon Dioxide)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Likely gray granite fragment
Granite, composed mainly of quartz, feldspar, and mica
igneous
Sandstone Pebble
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Quartz / Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Dendrite (Manganese Oxide Dendrites)
Psilomelane or Pyrolusite on Matrix (typically MnO2)
mineral
Sandstone (with potential iron mineralization)
Arenite
sedimentary
Banded Gneiss
Gneiss
metamorphic
Marble (White)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Moonstone
Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Sandstone
Arenite
sedimentary
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Jasper
Silicon dioxide, SiO2
Mineral
Red Scoria (Volcanic Cinder)
Scoria (Extrusive Mafic Igneous Rock)
igneous
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
sedimentary
Fossilized Gastropod (Snail)
Class Gastropoda (internal mold or 'steinkern')
sedimentary
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral