Multiple Choice
The only sure way to identify a plagioclase feldspar from a potassium feldspar on large enough specimen to see with the naked eye is to ________.
A) compare their colours, plagioclase is always darker
B) find multiple parallel twinning striations on a cleavage face
C) measure their exact cleavage angles, plagioclases have 120°
D) find wormy exsolution lamellae going obliquely across the cleavages
Correct Answer:
Verified
Correct Answer:
Verified
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