K-Feldspar Granite Fragment
Felsic Plutonic Rock (Granite)
Category
Browse mineral on igneous rock specimens identified by the Rock Identifier community.
K-Feldspar Granite Fragment
Felsic Plutonic Rock (Granite)
Fluorite on Host Rock
Calcium Fluoride (CaF2)
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
K-Feldspar (Potassium Feldspar)
Orthoclase / Microcline (KAlSi3O8)
Druzy Quartz
Silicon Dioxide (SiO2)
Granite (Giallo Ornamental / Venetian Gold)
Granite (composed mainly of Quartz, Feldspar, Biotite, and Garnet)
Feldspar (Plagioclase / Orthoclase)
KAlSi3O8 / CaAl2Si2O8 - NaAlSi3O8
Granite
Felsic intrusive igneous rock
Granite
Felsic intrusive igneous rock
Granite
Felsic intrusive igneous rock
Granite
Intrusive igneous felsic rock
Pebble
Clast (specifically a granule or small pebble)
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Diorite
Diorite (Intermediate intrusive igneous rock)
Granite
Felsic intrusive igneous rock
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
Diorite
Diorite (an intrusive igneous rock)
Dark igneous rock, likely basalt
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine or iron-titanium oxides
Quartz with Iron Staining
Silicon Dioxide (SiO2)
Sodalite
Na8Al6Si6O24(Cl,OH)2
Granite
Felsic intrusive igneous rock
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
Granite
Phaneritic Felsic Igneous Rock
Granite
Intrusive Igneous Rock
Granite
Felsic intrusive igneous rock
Basalt with Amygdules
Extrusive Igneous Rock (Mafic)
Quartz
Silicon Dioxide (SiO2)
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
Hematite
Iron(III) oxide (Fe2O3)
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
Porphyritic Basalt or Lamprophyre
Extrusive igneous rock with visible phenocrysts
Granite
Granite (Plutonic Igneous Rock)
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
Banded Carnelian Agate
Silicon Dioxide (SiO2)
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
Basalt (Amygdaloidal)
Amygdaloidal Basalt
Banded Sandstone (Water-worn Pebble)
Arenite with mineral banding
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock