igneous
Granite with Quartz/Feldspar Vein
Granite
Phaneritic (coarse-grained) texture, vitreous to dull luster, medium hardness (~6-7 Mohs). Speckled gray, white, and dark minerals with a distinct pinkish-tan quartz/orthoclase vein cutting through.
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Physical properties
Phaneritic (coarse-grained) texture, vitreous to dull luster, medium hardness (~6-7 Mohs). Speckled gray, white, and dark minerals with a distinct pinkish-tan quartz/orthoclase vein cutting through.
Formation & geological history
Formed underground through the slow cooling and crystallization of felsic magma deep within Earth's continental crust. The vein formed later as hot, mineral-rich hydrothermal fluids filled fractures in the cooling rock.
Uses & applications
Dimension stone, counter tops, monuments, construction aggregate, and landscape stones.
Geological facts
Granite makes up a huge portion of the Earth's continental crust. Veins like the one in this specimen often carry concentrated minerals including quartz, feldspar, and sometimes trace ores.
Field identification & locations
Identified in the field by its salt-and-pepper visible interlocking crystals of quartz, feldspar, and biotite mica. Commonly found along riverbeds, glacial deposits, and mountain ranges globally.
