different between plagioclase vs anorthosite

English

Etymology

From plagio- +? -clase, after German Plagioklas.

Pronunciation

• (UK) IPA^(key): /?ple?d???kle?z/
• (US) IPA^(key): /?plæd???kle?z/

Noun

plagioclase (usually uncountable, plural plagioclases)

1. (mineralogy) Any of a group of aluminum silicate feldspathic minerals ranging in their ratio of calcium to sodium.
   • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 51:

     These crystals are of one of the most abundant minerals in nature – feldspar; furthermore, they are of a particular kind of feldspar rich in the element calcium, termed plagioclase.

Translations

See also

• plagioclase on Wikipedia.Wikipedia
• albite
• oligoclase
• andesine
• labradorite
• bytownite
• anorthite
• rock
• mineral
• feldspar

Further reading

• David Barthelmy (1997–2021) , “Plagioclase”, in Webmineral Mineralogy Database
• “plagioclase”, in Mindat.org?^[1], Hudson Institute of Mineralogy, 2000–2021.

English

Noun

anorthosite (countable and uncountable, plural anorthosites)

1. (petrology) A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.
   • 1863, T. Sterry Hunt, "On the Chemical and Mineralogical Relations of Metamorphic Rocks", The American Journal of Science and Arts, Volume XXXVI, November, 1863, page 224:

     The second, or Labrador series is characterized, as already remarked, by the predominance of great beds of anorthosite, composed chiefly of triclinic feldspars […]

Translations