White quartz geode
Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode
mineral
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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Sandstone
Clastic Sedimentary Rock
sedimentary
Galena
Lead Sulfide (PbS)
mineral
Sandstone
Quartz Arenite
sedimentary
Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Chert (Pebble)
Silicon Dioxide (SiO2)
sedimentary
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Sandstone
Arenite (Silicon Dioxide with various mineral cements)
sedimentary
River Rocks (Polished River Pebbles)
Stream-rounded clastic sediments
Mixed (Sedimentary, Igneous, and Metamorphic)
Granite
Felsic Intrusive Igneous Rock
igneous
Likely schist, possibly serpentinite
Mica schist; potential chlorite–serpentine-rich metamorphic rock
metamorphic
Sandstone (clastic)
Clastic Sedimentary Rock (primarily composed of SiO2)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Arenite
sedimentary
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 composed primarily of quartz)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (primarily SiO2 with Feldspar)
sedimentary
White chalcedony or quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone
Clastic Sedimentary Rock (Quartz arenite or similar)
sedimentary
Gneiss
Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)
metamorphic
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular
sedimentary
Sandstone (Quartzose)
Arenite
sedimentary
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Unknown Rock Specimen
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Gneiss (specifically a Granitic Gneiss specimen)
Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Weathered basalt (possibly vesicular basalt)
Basalt; predominantly plagioclase, pyroxene, and commonly olivine
igneous
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Weathered metallic-looking rock, possibly hematite-bearing ironstone
Hematite-rich ironstone; hematite Fe₂O₃, potentially with magnetite Fe₃O₄ and quartz
mineral