Which describes the structure of hornblende ?
a) isolated tetrahedra
b) single chain
c) double chain
d) sheet
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Hornblende, calcium-rich amphibole mineral that is monoclinic in crystal structure. Hornblende's generalized chemical formula is (Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22 (OH)2. ... Hornblendes exhibit typical amphibole structures; these are based on double tetrahedral chains between which four metal sites are located
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