Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Category
Browse metamorphic, likely sedimentary with quartz veins specimens identified by the Rock Identifier community.
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Unknown Rock Specimen
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 principal composition)
Chert (with Desert Varnish/Iron Stain)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
Sandstone
Arenite (SiO2 based with mineral cement)
Quartzite River Stone
Quartzite (primarily SiO2)
Milk Quartz (White) and Yellow Aventurine (Yellow)
Silicon Dioxide (SiO2)
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Ferruginous Quartzite (Chert)
Quartzite with Iron inclusions (SiO2 + Fe2O3)
Native Gold (in the form of jewelry)
Gold (Au)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Fossiliferous Sandstone (with Brachiopod or Bivalve mold)
Clastic Sedimentary Rock with Macrofossil Mold
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
Milky Quartz (Water-Worn Pebble)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Banded Chert (with Quartz Vein)
Microcrystalline Silica (SiO2)
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
Jasper / Chert (River Pebble)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
Rough Quartz (likely Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
Native Gold (in earring form)
Gold (Au)
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
Quartz
Quartz (SiO2)
Red Garnet (likely Almandine or Pyrope)
Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Smoky Quartz
Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)
Rough Quartz
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Concretion with Quartz Veining
Septarian Concretion (CaCO3 / SiO2)
River Pebble (Quartz/Jasper)
Silicon Dioxide (SiO2)
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Marble
Recrystallized Calcite (CaCO3)