Red Claystone / Mudstone
Argillaceous sedimentary rock
sedimentary
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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Amber Calcite
Calcium Carbonate (CaCO3)
mineral
Tumbled quartz-rich rock, possibly jasperized quartz or quartzite
Quartz (SiO₂), likely with iron-oxide staining and minor feldspar or other silicate minerals; exact identification is uncertain from the photograph
metamorphic
Granite
Granite
igneous
Fossil Shell (Bivalve)
Phylum Mollusca, Class Bivalvia (typically composed of Calcium Carbonate / CaCO3)
sedimentary
Quartz Vein in Host Rock (often Granite or Schist)
Silicon Dioxide (SiO2) within host matrix
mineral with metamorphic or igneous host
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Basalt (Porphyritic Basalt)
Extrusive Igneous Rock
igneous
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Barite Rose (Desert Rose)
Barium Sulfate (BaSO4)
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Septarian Nodule (Pebble)
Septarian concretion (composition: CaCO3, calcite, aragonite, and clay/mudstone)
sedimentary
Dalmatian Stone
Dalmatian Jasper (actually a Peralkaline Igneous Rock)
igneous
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert / Chalcedony Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Amygdaloidal Basalt
Extrusive mafic igneous rock with amygdules
igneous
Siltstone
Siltstone (primarily composed of microcrystalline Quartz and Feldspar)
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Mixed River Pebbles (Jasper, Hematite, and Quartzites)
Silicon dioxide (Jasper/Quartz) and Iron oxide (Hematite)
sedimentary
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Iron-rich weathered stone, possibly hematite-rich ironstone
Hematite/goethite-bearing ironstone; predominantly Fe₂O₃ and FeO(OH)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Rock Specimen
Unclassified rock specimen
sedimentary
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Quartz Druze
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Sandstone
Arenite (siliciclastic sedimentary rock composed mostly of quartz)
sedimentary
Rock Crystal Quartz Bead
Silicon Dioxide (SiO2)
mineral
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich stone, possibly blue quartz or granite
Quartz (SiO₂), with probable feldspar and dark accessory minerals
mineral
Rodonite
Rhodonite (MnSiO3)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
sedimentary
Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (Chalcedony/Quartz), SiO2
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)
sedimentary