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anorthoclase

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anorthoclase [ə′nȯr·thə‚klās]
(mineralogy)
A triclinic alkali feldspar having a chemical composition ranging from Or40Ab60to Or10Ab90to about 20 mole % An, where Or = KAlSi3O8, Ab = NaAlSi3O8, and An = CaAl2Si2O8. Also known as anorthose; soda microcline.
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Anil points out that "Webster's 2nd defines pilandite as 'a leucocratic porphyry with phenocrysts, a groundmass of anorthoclase, and a little amphibole" and adds "Well at least I know what 'a', 'with', 'of', 'and', and 'little' mean.
Kickshaws by Morice, Dave / Word Ways
 
 
 
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