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Hornblende
The most common mineral of the amphibole group (Ca,Na)2-3 (Mg,Fe+2,Fe+3,Al)5(Al, Si)8O22(OH)2. It has a variable composition, and may contain potassium and appreciable fluorine. It is commonly black and occurs in distinct monoclinic crystals or in columnar, fibrous, or granular forms.
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