Definitions
from The Century Dictionary.
- noun The name given by Breithaupt to the group of triclinie feldspars the two prominent cleavagedirections in which are oblique to each other.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) A general term used of any triclinic feldspar. See the Note under
feldspar .
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun mineralogy Any of a group of
aluminum silicate feldspathic minerals ranging in their ratio ofcalcium tosodium .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun any of a series of triclinic feldspars that form rocks
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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I found a moonstone (the plagioclase feldspar oligocase) almost as big as my fist, almost perfectly round.
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(Feldspar) plagioclase, alkali-feldspar (H 6-6. 5)
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Most of the larger oxides and plagioclase are interstitial, having grown in the intercumulus pore spaces.
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Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.
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I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.
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Of course plagioclase feldspars are also one of my favorites so I might be a little partial here.
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The minerals included in this group are orthoclase, microcline, and the plagioclase feldspars.
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I was staring a Ca-rich plagioclase and pyroxenes and ilmentite.
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All of these rock types are light in color because of the dominance of quartz, potassium and sodium feldspars, and plagioclase feldspar minerals (Figure 1).
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These rocks are composed predominantly of the minerals plagioclase feldspar, amphibole, and pyroxene.
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