Granite
Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Porphyritic Andesite
Porphyritic Andesite (Intermediate Volcanic Rock)
igneous
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Quartz (specifically a water-worn river pebble)
Silicon Dioxide (SiO2)
Mineral
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
metamorphic
Orange Aventurine (Sunstone-style Quartzite)
Silicon Dioxide (SiO2) with Goethite or Hematite inclusions
metamorphic
Granite
Granite (compositionally: Quartz, Feldspar, Mica)
igneous
Granite (specifically Pink or Red Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Bumblebee Jasper
Fossiliferous Calcite containing Orpiment and Realgar
sedimentary
Granite Pebble
Granite
igneous
White Quartz (Tumbled)
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint Pebbles)
Microcrystalline quartz (SiO2)
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Granite
Granite
Igneous
Granite Pebble
Granite (Phaneritic Acidic Igneous Rock)
igneous
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
igneous
Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Gneiss
Gneiss (a rock type, not a specific mineral with a formula)
Metamorphic Rock
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Amazonite
Amazonite (KAlSi3O8)
mineral
Unakite
Epidotized Granite
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Chert (with Limestone and Iron Oxide staining)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Granite Cobble
Phaneritic Plutonic Felsic Rock
igneous
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Granite
Phaneritic plutonic rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Pink Granite (Gneissic Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group (e.g., Almandine: Fe3Al2(SiO4)3; Pyrope: Mg3Al2(SiO4)3)
Mineral
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal replacing organic matter)
sedimentary
Smoky Quartz (with Hematite inclusions)
Silicon Dioxide (SiO2)
mineral