American Heritage® Dictionary of the English Language, Fourth Edition
- n. A variety of diorite consisting chiefly of feldspar.
Century Dictionary and Cyclopedia
- n. In petrography, a granular or gneissoid igneous rock of eastern Canada, consisting chiefly of the plagioclase feldspar, labradorite. The name (first used by Hunt in 1863) is now applied to rocks composed largely of any lime-soda feldspar (plagioclase). The anorthosites are regarded by some petrographers as the highly feldspathic extreme of the gabbro family of igneous rocks.
- n. geology A phaneritic, intrusive igneous rock characterized by a predominance of plagioclase feldspar.
GNU Webster's 1913
- n. (Petrol.) A granular igneous rock composed almost exclusively of a soda-lime feldspar, usually labradorite.
- French anorthose, a kind of feldspar (Greek an-, not; see a-1 + Greek orthos, straight) + -ite1. (American Heritage® Dictionary of the English Language, Fourth Edition)
“In the southwest the underlying bedrock is granite and gneiss, in the north and east there are magmatic rocks including reddish rapakivi granite, gabbro and anorthosite.”
“To be precise, the scientists grew the marigolds in anorthosite, an earthly rock that is chemically very similar to the regolith of the Moon.”
“Alternative sources of aluminum might someday include kaolin clay, oil shales, the mineral anorthosite, and even coal waste.”
“An anorthosite complex, such as those in Labrador, the Adirondacks, and Niger there's some anorthosite in southern California too.”
“Later flights brought back a greater variety of specimens, including lighter-colored igneous rocks that were even older, called gabbros and anorthosite.”
“Michikamau, a direct distance of twenty miles and was the only anorthosite observed on the journey.”
“The western end of Kasheshebogamog Lake lies within the limit of the anorthosite  area, which extends from that point to Lake”
“Nordic Mining and Institute for Energy Technology IFE have initiated project work with purpose to develop new technology for production of alumina from anorthosite by use of CO”
“The alumina content of Nordic Mining's anorthosite is approximately 30% and is therefore potentially a major alumina source.”
“Norwegian Research Council with purpose to test anorthosite as a raw material for producing synthetic sorbent for CO”
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