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MINERALS INDEX
Pyrrhotite |
| FeS+S |
| Hexagonal |
Pyrrhotite, in grains, rounded crystals, and irregular masses, is common in the white limestone in quarries near Franklin. It is generally associated with the metamorphic minerals of the limestone, such as graphite, chlorite, tourmaline, amphibole, and scapolite, and more intimately with pyrite and arsenopyrite, both of which occur in sharp crystals enclosed in pyrrhotite. No individual crystals of pyrrhotite were found with plain faces, though many of them presented two broader surfaces that suggested original basal planes of crystals, now rounded and deeply etched by resorption. Some of these rounded and etched crystals were several inches in diameter and entirely lacked the basal parting found in some pyrrhotite, breaking instead with a brilliant conchoidal fracture. Masses of pyrrhotite were found in immediate contact was tourmaline and titanite, evidently later and molded against the surface of those minerals.
Qualitative chemical tests showed that the pyrrhotite contains no cobalt and but a trace of nickel.
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Website
© by Herb Yeates 1997-2001.
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This
page created: January 12, 2001 6:48 PM
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