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NaCa2Mg5Si7AlO22(OH)2
Monoclinic
Edenite, a sodium calcium magnesium silicate hydroxide mineral of the amphibole group, was reported by Palache (1935) from the Franklin marble on the basis of the compositional similarity of local material and the type material from New York. It has not been studied since. The analysis by Gonyer given by Palache is calculated as edenitic hornblende using the conventions of Leake (1978). Many crystals of green color from the various marble quarries in the area, and known to local collectors as edenite, were examined and found to be largely pargasite; some were edenitic magnesiohornblende or pargasitic hornblende. Much of the material described by Palache as edenite is likely pargasite, which is abundant here.
Edenite has been verified by the writer from Sterling Hill as 25 mm black euhedral crystals. An analysis is given in Table 12. Additional validated edenites are held in private collections, and one is in the Franklin Mineral Museum (FMM-Cook #168).
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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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