Materials
Anorthosite
Igneous Rocks
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Anorthosite is a coarse-grained intrusive igneous rock characterized by its composition: mostly plagioclase feldspar at ninety to one hundred percent, with a minimal mafic component of zero to ten percent. It forms through density separation, as plagioclase crystals, being less dense than magma, float to the top of a magma chamber and concentrate there as they crystallize.
Facts
Formation ClassIgneous, intrusive (a plagioclase feldspar-dominated rock formed by flotation of low-density crystals in a magma chamber) 1 Cross-Tradition Connections
Sources
1. Anorthosite (Wikipedia)
Wikimedia FoundationLead sectionQuote, Lead section
plagioclase crystals are usually less dense than magma; so, as plagioclase crystallizes in a magma chamber, the plagioclase crystals float to the top, concentrating there.
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