Vesicular Basalt
Basalt (Mafic Extrusive Volcanic Rock)
Category
Browse mineral or sedimentary rock (with mineral inclusions) specimens identified by the Rock Identifier community.
Vesicular Basalt
Basalt (Mafic Extrusive Volcanic Rock)
Chert (Jasper/Agate variety)
Cryptocrystalline Quartz (SiO2)
Granite
Granite
Milky Quartz
Silicon Dioxide (SiO2)
Basalt
Extrusive mafic igneous rock
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
Porphyritic Basalt
Porphyritic Basalt (Silicate Rock)
Granite
Phaneritic intrusive igneous rock
Granite
Felsic intrusive igneous rock
Lapis Lazuli (Tumbled Specimen)
Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
Tiger's Eye (Mineral Collection)
Tiger's Eye (SiO2 with crocidolite inclusions)
Vesicular Sandstone
Clastic Sedimentary Rock (Sandstone)
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
Blue Opal in Matrix
Hydrated Silica (SiO2·nH2O)
Granite Cobble
Felsic Intrusive Igneous Rock (Granite)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Milky Quartz (Tumbled)
Silicon Dioxide (SiO2)
Gneiss
Gneiss
Granite
Intrusive igneous felsic rock
Granite
Granite (Felsic Plutonic Rock)
Slate
Foliated Metamorphic Rock
Milky Quartz
Silicon Dioxide (SiO2)
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
Blue Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Milky Quartz
Silicon Dioxide (SiO2)
Granite River Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Shale with Coprolite influence
Argillaceous sedimentary rock (Shale/Mudstone)
Dalmatian Jasper
Peralkaline rhyolite with Arfvedsonite inclusions
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Green Quartz (Aventurine or Prase)
Silicon Dioxide (SiO2) with inclusions
Quartz Mineral
Silicon Dioxide (SiO2)
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
Green Aventurine
Silicon Dioxide (SiO2) with inclusions
Flower Agate
Chalcedony (Silicon Dioxide) with Plume Inclusions, SiO2
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
Granite (Polished Pebble)
Phaneritic Plutonic Rock (primarily Orthoclase and Quartz)
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)