Which one of the following is a sodium and calcium feldspar with striations?
A)plagioclase
B)sanidine
C)orthoclase
D)microcline

Name: Which one of the following is a sodium and calcium feldspar with striations? A)plagioclase B)sanidine C)orthoclase D)microcline
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Question

Quizplus · Accepted Answer

Plagioclase is the only feldspar among the given choices that contains both sodium and calcium, as well as striations. Sanidine and orthoclase are both potassium feldspars, while microcline is also a potassium feldspar but lacks striations.

Which One of the Following Is a Sodium and Calcium