Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)
Browse sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate) specimens identified by the Rock Identifier community.
Marble
Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)
Metamorphic Rock
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Quartz Pebble (Geode-like)
Silicon Dioxide (SiO2)
Mineral
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Vesicular Sandstone
Clastic Sedimentary Rock (Sandstone)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3, CaMg(CO3)2, SiO2)
sedimentary
Manganese-coated Sandstone
Clastic sedimentary rock with Manganese Oxide (often Pyrolusite or Psilomelane)
sedimentary
Gneiss
High-grade regional metamorphic Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Granite (Weathered/Oxidized)
Phaneritic Felsic Igneous Rock (composed of Quartz, Orthoclase Feldspar, and Mica)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement) SiO2
sedimentary
Chert (with Iron Staining)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony in Host Rock
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone (with Iron Oxide)
Arenite with Limonite/Hematite staining
sedimentary
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum; CuAl6(PO4)4(OH)8·4H2O
mineral
Folded Schist / Gneiss (Metamorphic Rock)
Regional Metaphoric Folded Outcrop (predominantly Schist/Gneiss)
metamorphic
Basalt
Basalt
Igneous
Granite (phaneritic background) with Limestone/Calcite carving
Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)
igneous and sedimentary
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Quartz (variety of colors)
SiO2 (Silicon Dioxide)
Mineral
Flint
Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)
Mineral
Mica Schist with Iron Staining
Mica Schist
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Carnelian Agate
Carnelian (SiO2 with iron oxide impurities)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic