What is the most effective way to differentiate potassium feldspar from plagioclase feldspar?
a. Plagioclase feldspars have cleavage planes in two directions at 90?, whereas potassium feldspars have cleavage planes in two directions not at 9?.
b. Potassium feldspars have cleavage planes in two directions at 90?, whereas plagioclase feldspars have cleavage planes in two directions not at 90?
c. Some cleavage planes of potassium feldspars have striations, whereas no plagioclase feldspars have striations.
d. Potassium feldspar is harder than plagioclase feldspar.
e. Some cleavage planes of plagioclase feldspars have striations, whereas no potassium feldspars have striations.
e. Some cleavage planes of plagioclase feldspars have striations, whereas no potassium feldspars have striations.
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