1) Albite 2) Albitic 3) Anorthite 4) Anorthitic 5) Plagioclase
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https://www.crosswordclues.com/clue/oligoclase
1) Feldspar 2) Felspar 3) Plagioclase 4) Sodium mineral
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https://www.crosswordclues.com/clue/oligoclase
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 (NaAlSi3O8) and anorthite (CaAl2Si2O8). The albite:anorthite molar ratio ranges from 90:10 to 70:30. Oligoclase is a high sodium feldspar crystallizing in the tri...
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http://en.wikipedia.org/wiki/Oligoclase
• (n.) A triclinic soda-lime feldspar. See Feldspar.
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http://thinkexist.com/dictionary/meaning/oligoclase/
the most common variety of the feldspar mineral plagioclase (q.v.).[2 related articles]
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http://www.britannica.com/eb/a-z/o/14
Ol'i·go·clase noun [
Oligo- + Greek ... fracture, from ... to break.]
(Min.) A triclinic soda-lime feldspar. See
Feldspar .
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http://www.encyclo.co.uk/webster/O/17
Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 7. It is a plagioclase feldspar. It is of interest to petrologists and collectors. Varieties: labradorite, anorthite.
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http://www.probertencyclopaedia.com/browse/HO.HTM
oligoclase A kind of plagioclase feldspar occurring commonly in white crystals, sometimes shaded with gray, green, or red. Plagioclase refers to any of a series of common feldspar minerals, consisting of differing mixtures of sodium and calcium aluminum silicates. Plagioclase is typically white, yellow, or reddish-gray, but it can also be blue to...
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http://www.wordinfo.info/words/index/info/view_unit/1460/2
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