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Amphibole
AMPHIBOLE

Definition: Any mineral of a group differing from the pyroxenes in cleavage angles (about 56 degrees instead of about 87 degrees), silicates of calcium, magnesium, and other metals, including hornblende, actinolite, tremolite, etc.
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See perfect mineral (1).

See perfect specificity.

See perfect group (4).

See perfect particularness.

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