Origin of orthoclase
Examples from the Web for orthoclase
If the initial composition of the magma is represented by a point between the two eutectic points, orthoclase will separate first.The Phase Rule and Its Applications|Alexander Findlay
The particular feldspar that furnishes most of the moonstone is orthoclase, a silicate of potassium and aluminum.A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public|Frank Bertram Wade
Amelia Court House, Virginia, is another locality whence come pieces either of orthoclase or oligoclase exhibiting this property.
Minettes contain biotite and orthoclase; kersantites, biotite and plagioclase.
Examples of substances exhibiting these three kinds of dispersion are borax, orthoclase and gypsum respectively.