Oligoclase occurs, often accompanying orthoclase, as a constituent of plutonic igneous rocks such as granite, syenite, and diorite.
12.
This is coloured yellow brown to pink and contains fine crystals of perthite, and oligoclase and quartz, coloured by limonite.
13.
The mineral content and elemental abundance indicates " Jake M " rock may be a mugearite, a sodium rich oligoclase-bearing basaltic trachyandesite.
14.
The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen in orthoclase : hence two kinds of sunstone are distinguished as " oligoclase sunstone " and " orthoclase sunstone ."
15.
The feldspar which usually displays the aventurine appearance is oligoclase, though the effect is sometimes seen in orthoclase : hence two kinds of sunstone are distinguished as " oligoclase sunstone " and " orthoclase sunstone ."
16.
This leads via the replacement of primary K-feldspar ( perthitic and non-perthitic microcline ) to the formation of plagioclase ( albite or oligoclase ) and in certain places also to the formation of myrmekite.
17.
For example, the plagioclase feldspars comprise a continuous series from sodium-rich end member albite ( NaAlSi 3 O 8 ) to calcium-rich anorthite ( CaAl 2 Si 2 O 8 ) with four recognized intermediate varieties between them ( given in order from sodium-to calcium-rich ) : oligoclase, andesine, labradorite, and bytownite.
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