Pyrite
Iron Sulfide (FeS2)
mineral
Category
Mineral In Igneous Rock
Browse mineral in igneous rock specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Basalt
Basalt (Aphanitic Mafic Igneous)
igneous
Basalt
Basalt (Extrusive Mafic Igneous)
igneous
Basalt
Basalt
igneous
Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Granodiorite (River Pebble)
Granodiorite
igneous
Scoria (Red Lava Rock)
Scoria
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Milky/Common variant)
Silicon Dioxide (SiO2)
mineral
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8
igneous
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartz (in matrix)
Quartz (SiO₂)
mineral
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz / Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
igneous
Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Bauxite (Laterite Clay)
Bauxite (mixture of Hydrous Aluminum Oxides: Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (principally SiO2)
igneous
Unakite
Unakite Epidosite (Granite with epidote and orthoclase)
metamorphic
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral