The Amphibole chemical formula is
Mg,Fe,Ca,Na)2-3(Mg,Fe,Al)5(Si,Al)8O22OH2.
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Granite is a rock containing both amphibole and potassium
feldspar.
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The individual minerals in the Amphibole group are between 5-6
on the Mohs scale.
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2
120,60 degrees
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An amphibole is a large group of structurally similar double
silicate minerals, containing various combinations of sodium,
calcium, magnesium, iron, and aluminium.