Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
Granitic Sand
Detrital sediment (predominantly Quartz, Feldspar, and Mica)
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
Granite
Phaneritic plutonic rock (composed mainly of SiO2, Al2O3, K2O, and Na2O)
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
Gneiss
Gneiss (High-grade regional metamorphic rock)
Gneiss
Gneiss
Granite Pebble
Granite (composition of Quartz, Alkali Feldspar, and Plagioclase)
Blue Sapphire
Corundum (Al2O3)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)
Granite with Quartz Vein
Phaneritic Felsic Igneous Rock (composed of Quartz [SiO2], Feldspar, and Mica)
Biotite (Black Mica)
Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
Granite (Weathered)
Course-grained Intrusive Igneous Rock
Basalt
Basalt (a mafic extrusive igneous rock)
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Granite
Granite (Phaneritic intrusive igneous rock)
Gneiss
Gneiss
Granite
Granite
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
Diorite
Phaneritic Intrusive Igneous Rock (Intermediate Composition)
Diorite (River Pebble)
Diorite (Intermediate intrusive igneous rock)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Granite
Granite (Felsic intrusive igneous rock)
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
Basalt with Quartz Vein and Weathering Crust
Amygdaloidal or Porphyritic Basalt
Diorite (Salt and Pepper Rock)
Diorite
White Quartz Pebble
Silicon Dioxide (SiO2)
Gneiss
Gneiss (High-grade Metamorphic Rock)
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
Quartz (Milky or Common Quartz)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide with Iron and Titanium impurities)
Pink Granite
Felsic intrusive igneous rock (composition: SiO2 and Al2O3)
Basalt River Rock
Basalt (Aphanitic Mafic Igneous Rock)
Olivine Basalt
Mafic Volcanic Rock (rich in (Mg, Fe)2SiO4)