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Any of a rock-forming series of triclinic feldspars
Answer for the clue "Any of a rock-forming series of triclinic feldspars ", 10 letters:
oligoclase
Word definitions for oligoclase in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (context mineralogy English) A plagioclase feldspar, the second member of the Albite-Anorthite solid solution series. Primarily found as small crystals in impure marble. Oligoclase contains a small amount of calcium substituting for some of the sodium ...
WordNet
Word definitions in WordNet
n. any of a rock-forming series of triclinic feldspars [syn: plagioclase ]
Wikipedia
Word definitions in Wikipedia
Oligoclase is a rock-forming mineral belonging to the plagioclase feldspars . In chemical composition and in its crystallographic and physical characters it is intermediate between albite ( Na Al Si O ) and anorthite ( CaAl SiO). The albite:anorthite molar ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Oligoclase \Ol"i*go*clase\, n. [Oligo- + Gr. ? fracture, fr. ? to break.] (Min.) A triclinic soda-lime feldspar. See Feldspar .