Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Category
Sedimentary Rock (Cryptocrystalline Quartz)
Browse sedimentary rock (cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral
Quartzite with inclusions
Quartzite (primarily SiO2)
metamorphic
Bumblebee Jasper
Fossiliferous Calcite containing Orpiment and Realgar
sedimentary
Ocean Jasper
Silicon Dioxide (SiO2) with various inclusions
igneous/sedimentary mixed (Orbicular Jasper)
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Quartz Geode/Druzy Quartz
Quartz (SiO₂)
Mineral
River Cobble (Phyllite or Quartzite)
Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)
metamorphic
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
igneous
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (Unbroken)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits
Jasper
Jasper (Silica/Quartz) - SiO2
sedimentary
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Red Sandstone (Iron-rich Sandstone)
Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Jasper in Quartz (River Cobble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebbles or River Rock
Quartzite / Microcrystalline Quartz (SiO2)
sedimentary
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
sedimentary
Chert Pebble
Chert (composed primarily of Microcrystalline Quartz, SiO2)
sedimentary
Quartzite
Quartzite
Metamorphic rock
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Metamorphic Rock (variety of Quartz)
Vesicular Basalt
Vesicular Basalt
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Gneiss (specifically Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral