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Amphibole (hornblende)
Formula
(Na,K)0-1Ca2(Mg,Fe2+,Fe3+,Al)5Si6-7.5Al2-0.5O22(OH)2
Structure
Chain silicate
Crystal System
Crystal system: monoclinic (+) (-)
Physical Properties
Colour in hand specimen: black Cleavage: two at ~56° Hardness: 5-6
Optical…