igneous
Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
Hardness 6-7 (overall), white to grayish-white quartz with green/silver micaceous layers and pinkish-white feldspar. Vitreous to pearly luster. Crystal system is trigonal/monoclinic.
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Physical properties
Hardness 6-7 (overall), white to grayish-white quartz with green/silver micaceous layers and pinkish-white feldspar. Vitreous to pearly luster. Crystal system is trigonal/monoclinic.
Formation & geological history
Formed through the slow cooling of magma deep within the Earth's crust, allowing for the growth of distinct mineral crystals. Often found in batholiths and surrounding metamorphic belts.
Uses & applications
Primarily used for geological study, landscaping, and if polished, as decorative pocket stones. Industrially, its components are used in glass and ceramics.
Geological facts
Pegmatites are known for containing the largest crystals of any rock type on Earth. This specimen shows the common association of the three primary granite minerals.
Field identification & locations
Identify by looking for the vitreous luster of quartz alongside the characteristic flat, shiny flakes of mica and the blocky cleavage of feldspar. Found globally in continental basement rocks.
