Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A white to colorless triclinic mineral of the alkali feldspar group that contains a higher proportion of sodium than potassium and is a common constituent in the matrices of slightly alkaline volcanic rocks.
from The Century Dictionary.
- noun A triclinic feldspar allied to microcline but containing a considerable amount of soda: characteristic of certain igneous rocks, as the andesite of Pantelleria.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A feldspar closely related to orthoclase, but triclinic. It is chiefly a silicate of sodium, potassium, and aluminium. Sp. gr., 2.57 -- 2.60.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy Any of a group of
feldspars being mixedsodium andpotassium aluminosilicates .
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
[Greek an-, not; see a– + orthos, straight + klasis, a breaking (from its having two planes of cleavage intersecting at a slightly oblique angle); see orthoclase.]
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Examples
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Blocks of anorthoclase - and clinopyroxene-bearing micorgaphic granophyre (click for photo) were ejected with rhyolitic pumice during a late-Pleistocene eruption at the Alid volcanic center, Eritrea.
Granophyre.html 1998
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Both have phenocrysts of normally zoned anorthoclase, ferroaugite, magnetite, minor quartz, zircon, sulfide and apatite.
Granophyre.html 1998
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