Quartz
Quartz (SiO₂)
Category
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
Quartz
Quartz (SiO₂)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Quartz
Quartz (SiO₂)
River Pebble (Sandstone / Quartzite)
Sedimentary rock (Quartz arenite / Quartzite pebble)
Quartzite River Rock
Quartzite (primarily SiO2)
White calcite (likely tumbled calcite or marble fragment)
Calcite, calcium carbonate (CaCO₃); if the specimen is granular and rock-like, it may be marble, a calcite-rich metamorphic rock
Quartzite
Quartzite (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
White quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
Aventurine
Aventurine Quartz (SiO2 + Fuschite inclusions)
Milky Quartz
Silicon Dioxide (SiO2)
Quartzite River Rock
Quartzite (SiO2)
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Banded gneiss (weathered glacial erratic)
Gneiss; typically quartz–feldspar–biotite ± hornblende
Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
Citrine
Citrine (Silicon Dioxide - SiO2)
Quartzite
Quartzite (SiO2)
Polished Marble (likely Carrara-type with Iron oxides)
Metamorphosed Carbonate (CaCO3)
Quartzite
Metamorphosed Quartz Sandstone
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Quartzite with Vugs
Metamorphosed Quartz Sandstone (SiO2)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)
Agate
Silicon dioxide (Chalcedony), SiO2
Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
Quartz-veined Metamorphic Rock (Wishing Stone)
Quartz-veined Metamorphic/Igneous Host Rock with Quartz Veinlets
Quartz Vein in Matrix
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Quartz (SiO₂)
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
Magnetite Ore
Magnetite (Fe3O4)
Likely serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite
Red Garnet
Garnet Group (e.g., Pyrope, Almandine, Spessartine, Grossular, Andradite, Uvarovite)
Garnet (Almandine/Pyrope)
Silicate Mineral (Group: X3Y2(SiO4)3 where X=Mg, Fe, Mn and Y=Al, Fe, Cr)
Schist
Schist (various mineral compositions)
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
Unakite
Epidotized Granite
Greenstone / serpentinized ultramafic rock (probable)
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and talc
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
Tumbled jasper, likely red/brown jasper
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
Clear Quartz (or Rock Crystal)
Quartz (SiO₂ - Silicon Dioxide)
Orange Calcite
Calcium Carbonate (CaCO3)