MINERALS INDEX
Chlorite |
| H8Mg5Al2Si3O18 |
| Monoclinic |
Chlorite is rare at Franklin. A massive, very fine grained dull-green form of chlorite was identified on a single specimen, probably found in the Parker shaft, sent by the Foote Mineral Company for examination. The chlorite is mixed with yellow garnet, willemite, and manganiferous biotite and is so related to the biotite as to make it seem highly probable that it is the result of the alteration of that mineral.
Platy crystals of dark-green chlorite line the cavity in which crystals of friedelite (see page 89) of great perfection were formed. The optical properties of the mineral seem to indicate penninite, but no detailed examination was possible. The outer portions of the specimen are also composed of very compact chlorite, much slickensided.
In recently found specimens of sphalerite, described on page 28, the last mineral deposited in the open vugs was a delicate coating of silvery scales of a chlorite containing a little iron and probably to be identified with diabantite, according to an optical determination by Berman.
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© by Herb Yeates 1997-2006.
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page created: August 12, 2006 5:53 PM
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