Quartz (Grain/Pebble)
Silicon Dioxide (SiO2)
Category
Browse metamorphic, likely sedimentary with quartz veins specimens identified by the Rock Identifier community.
Quartz (Grain/Pebble)
Silicon Dioxide (SiO2)
Quartz (Milk Quartz / Massive Quartz)
Silicon Dioxide (SiO2)
Yellow chalcedony (likely citrine or iron-stained quartz)
Microcrystalline quartz, SiO₂; yellow coloration likely from iron oxides or included quartz varieties
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Mixed Mineral and Fossil Collection
Multi-specimen assemblage (SiO2, CaCO3, FeS2, etc.)
Quartz (Pink / Ferruginous)
Silicon Dioxide (SiO2)
Quartz River Rock
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Quartz Mineral Specimens
Quartz (Silicon Dioxide, SiO2)
Banded gneiss (weathered glacial erratic)
Gneiss; typically quartz–feldspar–biotite ± hornblende
Pyrite
Iron Sulfide (FeS2)
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
Petrified Wood
Silicified Wood (primarily SiO2)
Quartz (Milky or Yellow/Citrine Quartz)
Silicon Dioxide (SiO2)
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
Likely tumbled calcite or pale limestone fragment
Calcite (CaCO₃), possibly microcrystalline limestone
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Smoky Quartz / Chalcedony
Silicon Dioxide (SiO2)
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
Pyrite in Quartz
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Banded gneiss
Felsic biotite–quartz–feldspar gneiss
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
White Quartz
Silicon Dioxide (SiO2)
Hard Sandstone (Quartzite)
Quartz-rich Sedimentary Rock (Proto-Quartzite)
Quartz
Silicon Dioxide (SiO2)
Quartzite
Quartzite (containing SiO2)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
White Quartz
Silicon Dioxide (SiO2)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Milky quartz crystal
Quartz, silicon dioxide (SiO₂), likely a small prismatic crystal or crystal fragment
Mica Schist with Iron Staining
Muscovite/Biotite Schist
Quartz (Raw Specimen)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Pyrite in Quartz
Iron Disulfide (FeS2) in Silicon Dioxide (SiO2)
Quartz (in matrix)
Quartz (SiO₂)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions