Weathered quartz-rich rock, possibly chert or milky quartz
Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph
mineral
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Sandstone (Pebble)
Arenite / Clastic Sedimentary Rock
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Bauxite
Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Pyrite (on Quartz/Host Rock)
Iron Sulfide (FeS₂)
mineral
Granite
Granite (Felsic intrusive igneous rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Jasper (Mookaite / Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Sandstone (Calcareous or Quartz-rich)
Arenite
sedimentary
Quartz Geode Cluster (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Magnetite with Serpentine
Magnetite (Fe3O4) in Serpentine Matrix
mineral
Dalmatian Jasper
Peralkalic Quartz-Feldspar Porphyry
igneous
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone / Quartzite
Sedimentary quartz arenite
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Arenite (SiO2 + varied clasts)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary
Gneiss
Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Red Sandstone
Sedimentary Quartz Arenite / Arkose
sedimentary
Asphalt (Bituminous Pavement)
Bituminous mix (Aggregates with Bitumen binder)
sedimentary
Iron-rich brown stone, possibly weathered chert or ironstone
Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)
sedimentary
Silicon Carbide (Carborundum)
Silicon Carbide, SiC
mineral
Weathered quartz-rich cobble, possibly milky quartz with iron staining
Quartz (SiO₂), likely with iron-oxide/hydroxide coatings and minor host-rock inclusions
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Dyed blue howlite (turquoise imitation), possibly dyed magnesite
Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.
gemstone
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Colorless Quartz (Rhinestone)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Sandstone (likely Arkose)
Arenite (composed mainly of SiO2 with Feldspar)
sedimentary
Fossiliferous Limestone
Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)
fossil
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral