Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Thunderegg (Agate-filled Geode Node)
Silicon dioxide (SiO2) with various inclusions
sedimentary/igneous association
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Breciated Limestone with Calcite Veins
Sedimentary Breccia (CaCO3)
sedimentary
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
sedimentary
Ferruginous Quartz Cobble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Nuummite
Nuummite (Orthorhombic amphiboles: Anthophyllite and Gedrite)
metamorphic
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Polygenetic Breccia
Clastic Breccia (containing lithic fragments in a fine-grained matrix)
sedimentary
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Prehnite on Basalt
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Schist
Mica Schist (Quartz-Muscovite-Biotite Schist)
metamorphic
Banded Agate (Onyx type)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Granite
Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)
igneous
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Magnetite (Small Granule)
Magnetite (Fe3O4)
mineral
Milky Quartz Geode with Chlorite
Silicon Dioxide (SiO2) with Chlorite group inclusions
mineral
Feldspathic Granite (likely Syenite or Granite Pegmatite)
Phaneritic Acidic Igneous Rock (KAlSi3O8 dominant with SiO2)
igneous
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
sedimentary
Shale
Fissile mudstone (Shale)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst
Silicon dioxide with iron impurities (SiO2)
mineral
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral