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Rare plagioclastic feldspar occurring in many igneous rocks
Answer for the clue "Rare plagioclastic feldspar occurring in many igneous rocks ", 9 letters:
anorthite
Word definitions for anorthite in dictionaries
WordNet
Word definitions in WordNet
n. rare plagioclastic feldspar occurring in many igneous rocks
Wikipedia
Word definitions in Wikipedia
Anorthite is the calcium endmember of plagioclase feldspar . Plagioclase is an abundant mineral in the Earth 's crust . The formula of pure anorthite is Ca Al Si O .
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Anorthite \A*nor"thite\, n. [Gr. 'an priv. + ? straight (? sc. ? right angle); not in a right angle.] A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See ...
Wiktionary
Word definitions in Wiktionary
n. (context mineral English) A variety of plagioclase feldspar, the calcium endmember of that series.
Usage examples of anorthite.
Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
In chemical composition and in optical and other physical characters it is thus much nearer to the anorthite end of the series than to albite.