Discussion
Hornblende is distinguished from augite in hand specimen chiefly by its
Answer: A
Correct answer: cleavage angles of about 56 and 124 degrees
Both are dark ferromagnesian minerals of similar colour and hardness, and the cleavage angle is what separates them. Hornblende is a double-chain amphibole, and the wider chain gives cleavages meeting at about 56 and 124 degrees; augite, a single-chain pyroxene, cleaves at close to ninety.
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