Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Category
Igneous, Sedimentary, Or Metamorphic (Mineral Based)
Browse igneous, sedimentary, or metamorphic (mineral based) specimens identified by the Rock Identifier community.
Learn about Igneous, Sedimentary, Or Metamorphic (Mineral Based) in the encyclopedia
View all →
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Mixed gemstone jewelry collection
Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline
gemstone
Sandstone
Arenite (SiO2 based)
sedimentary
Polished orbicular granite (likely larvikite or orbicular diorite)
Quartz/feldspar-bearing granitoid with dark amphibole–biotite minerals; exact variety requires testing
igneous
Greenschist
Chlorite Schist
metamorphic
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Sandstone (Quartz Sandstone)
Arenite (SiO2 based)
sedimentary
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (with biological crust)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Iron-rich rock, possibly weathered basalt or ironstone
Tentatively ferruginous basalt; exact identification requires testing
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Tumbled orbicular granite or granitic gneiss
Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Clear Quartz
SiO2 (Silicon Dioxide)
gemstone
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Feldspathic Gneiss
High-grade Metamorphic Rock (Gneiss)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Likely faceted colorless gemstone
Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph
gemstone
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂)
metamorphic