Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Category
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Gneiss (River Cobble)
Metamorphic Gneiss
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz with Schorl inclusions
Silicon Dioxide (SiO2) with Sodium Iron Aluminum Borosilicate Hydroxide (Black Tourmaline)
Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Amethyst
Silicon dioxide (SiO2) with iron impurities
Hematite
Iron(III) oxide (Fe2O3)
Agate Geode with Quartz Druzy
Cryptocrystalline Quartz (SiO2)
Jasper
Silicon dioxide (SiO2)
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
Chert (Flint/Jasper)
Silicon Dioxide (SiO2)
Quartz (River Pebble) and Chert/Jasper
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Pyrite
Iron Disulfide (FeS2)
Gneiss
Gneiss
Gneiss
Gneiss (Foliated Metamorphic Rock)
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
Banded Gneiss
Gneiss (Metamorphic silicate rock)
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
Botryoidal Chalcedony (Agate/Desert Rose Chalcedony)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Hematite
Ferric Oxide (Fe2O3)
Dyed Pink Agate Slice
Cryptocrystalline variety of Quartz (SiO2)
Quartz (Milky Quartz)
Silicon Dioxide (SiO₂)
Greenschist
Chlorite schist
Gneissic Schist
Foliated Metamorphic Rock (Schist/Gneiss transition)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Gneiss
Gneissic Metamorphic Rock
Rough Quartz
Quartz (Silicon Dioxide, SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
Hematite
Iron(III) oxide (Fe2O3)