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Ca2(Fe,Mg)5Si8O22(OH)2
Monoclinic
Ferroactinolite, a calcium iron silicate hydroxide mineral of the amphibole group, has been found and analyzed on only one specimen from Franklin, in which green massive ferroactinolite is associated with epidote. Nothing is known of its occurrence; given the low Zn content, it might be from Balls Hill where similar, but unstudied specimens have been found. A microprobe analysis is given in Table 12.
Ferroactinolite was reported from Sterling Hill by Reilly (1983). It was found in drill-hole #124, 119 feet from its origin on the 340 level, associated with calcite, franklinite, hedenbergite, and andradite. Three microprobe analyses were provided, the most iron-rich of which yielded SiO2 50.62, Al2O3 0.55, CaO 10.99, FeO 26.64, MnO 0.41, MgO 4.30, K2O 0.30, ZnO 4.09, total = 97.9 wt. %.
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| Copyright © 1995 by Pete J. Dunn |
Website
by Herb Yeates
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Link
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This
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