Gneiss
Gneiss (High-grade Metamorphic Rock)
Category
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
Gneiss
Gneiss (High-grade Metamorphic Rock)
Amethyst (Quartz)
SiO2 (Silicon Dioxide)
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities), formula: SiO2
Geode (Quartz)
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Porphyritic Rhyolite (Red)
Rhyolite (Porphyry)
Sandstone (Quartzose Sandstone)
Arenite (SiO2)
Oolite (Ooids)
Oolitic Limestone (Principal mineral: Calcite, CaCO3)
Sandstone
Arenite (SiO2 based)
Chert (varietal Flint)
Silicon Dioxide (SiO2)
Moqui Marble
Iron Oxide Concretion
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Hematite/Goethite-encased Sandstone)
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
Quartzite with Quartz Vein
Metamorphosed sandstone (SiO2)
Wishing Stone (Quartz-veined Siltstone or Graywacke)
Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
Sandstone (specifically Red Sandstone)
Arenite (SiO2 with Iron Oxide)
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
Sandstone (likely Quartzose Sandstone pebble)
Arenite (primarily SiO2)
Basalt
Basalt
Banded Agate (Orca Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Moqui Marble
Iron Oxide Concretion (Hematite/Goethite-cemented Sandstone)
Mica Schist
Mica Schist (primarily Muscovite and/or Biotite composition)
Sandstone (Micaceous/Feldspathic variant)
Arenite (specifically subarkose or lithic arenite)
Conglomerate
Polymictic Conglomerate
Clear Quartz
Silicon Dioxide (SiO2)
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
Dendritic Siltstone (or Mudstone)
Siltstone with Manganese Oxide dendrites
Quartz (Milky Quartz)
Quartz (SiO2 - Silicon Dioxide)
Mixed Tumbled Stones Collection
Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2)
Opal
Hydrated Silica (SiO2·nH2O)
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)