Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Category
Mineral Or Sedimentary Rock (With Mineral Inclusions)
Browse mineral or sedimentary rock (with mineral inclusions) specimens identified by the Rock Identifier community.
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Likely weathered quartz-rich rock, possibly smoky quartz or chert
Quartz (SiO₂), though exact identification is uncertain from the photograph
mineral
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Picture Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
African Turquoise
African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)
sedimentary
Jasper (Polychrome Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Tumbled jasper (likely picture/brecciated jasper)
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
mineral
Red Sandstone
Arenite
sedimentary
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Water-worn chalcedony pebble
Chalcedony, microcrystalline SiO₂; possibly iron-stained agate
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Tumbled cream-colored stone, possibly quartz or calcite
Indeterminate from photograph; likely microcrystalline quartz (SiO₂) or calcite (CaCO₃)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Chalcedony Nodule (Agate/Chert)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Greywacke with Quartz Vein
Greywacke (immature sandstone) with SiO2 inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Rounded river cobble, likely weathered sandstone or quartzite
Indeterminate clastic silicate rock; possibly quartz-rich sandstone (SiO₂-dominant)
sedimentary
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Banded gneiss
Quartzo-feldspathic gneiss, likely biotite-bearing
metamorphic
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
igneous
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Sandstone (with Quartz Vein/Inclusion)
Arenite (primarily SiO2)
sedimentary
Yellow Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)
Silicon Dioxide (SiO2)
sedimentary
Mica Schist with Pyrite
Mica Schist (FeS2 containing)
metamorphic