Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Community gallery
All rocks & minerals
Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.
Explore the rock & mineral encyclopedia
View all →
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Lake Superior Agate
Chalcedony (SiO2)
sedimentary
Quartzite with Quartz Vein
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Quartz Vein in Basalt
Silica-infilled basaltic host rock
igneous
Wishing Stone (Quartz-veined Porphyritic Basalt)
Igneous rock with quartz vein (SiO2)
igneous
Starfish Fossil
Asteroidea fossil
fossil
Pumice
Pumice (Volcanic Rock / Glass Froth)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Staurolite
Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Chiastolite
Andalusite variety Chiastolite (Al2SiO5)
mineral
Quartz Vein Rock
Silicon dioxide (SiO2) within a host rock matrix
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartz with Tourmaline
Silicon Dioxide (SiO2) with complex cyclosilicate inclusions
mineral
Quartz with Tourmaline
Silicon Dioxide with complex boro-silicate (Quartz: SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
igneous
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Quartzite with inclusions
Metamorphosed quartz sandstone
metamorphic
Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite
Silicate rock with contrasting xenolith/inclusion
igneous
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
mineral
Pearl (Biogenic Gemstone)
Calcium Carbonate (Aragonite and Calcite) with Conchiolin
gemstone
Quartzite
Metamorphic Quartz Arenite
metamorphic
Natural Freshwater Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
gemstone
Amber
Fossilized tree resin
gemstone
Banded Sandstone / Quartzite Pebble
Quartzose Arenite with Iron Oxide Banding
sedimentary
Amber
Fossilized Tree Resin
gemstone