1) What is the most effective way to differentiate potassium feldspar from plagi

Question

1) What is the most effective way to differentiate potassium feldspar from plagioclase feldspar?

2) What are the four stages of the evolution of an ocean basin from first to last?

a)Some cleavage planes of potassium feldspars have striations, whereas no plagioclase feldspars have striations. b)Potassium feldspars have cleavage planes in two directions at 90, whereas plagioclase feldspars have cleavage planes in two directions not at 90 c) Potassium feldspar is harder than plagioclase feldspar. d) Some cleavage planes of plagioclase feldspars have striations, whereas no potassium feldspars have striations. e) Plagioclase feldspars have cleavage planes in two directions at 90, whereas potassium feldspars have cleavage planes in two directions not at 9.

Explanation / Answer

Question 1) Answer : option d) Some cleavage planes of plagioclase feldspars have striations, whereas no potassium feldspars have striation

Reason : Both of the feldspars display two cleavages and an overlapping range of colors, but only plagioclase displays tiny grooves on cleavage known as striations

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