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Improving Mindat.orgChloanthite

12th Dec 2014 14:29 UTCReiner Mielke Expert

http://www.mindat.org/min-1009.html This page has incorrect information " Regarded as an arsenic-deficient variety of nickelskutterudite or simply as a synonym for nickelskutterudite." is not correct. Chloanthite is a discredited species that is a mixture of different minerals and has no synonym.

From Roseboom 1962:

"Prior to Holmes'classification, the nomenclature of the Co, Ni, and Fe

arsenides was complicated by the acceptance of arsenide minerals of

cobalt and nickel which appeared to have isometric symmetry but whose

chemical analyses indicated that they were more nearly diarsenides than

triarsenides. "Isometric diarsenides" rich in nickel were called chloanthite

and those rich in cobalt were called smaltite. However, the x-ray patterns

of various specimens of chloanthite and smaltite were found to correspond

to those of skutterudite, Ioellingite, rammelsbergite, saffiorite or a mixture

of these.

As a consequence of this misinformation many photos on the nickelskutterudite page are not of nickelskutterudite but of skutterudite ( unless proven otherwise) ie: http://www.mindat.org/photo-542232.html, http://www.mindat.org/photo-572705.html, http://www.mindat.org/photo-139193.html, http://www.mindat.org/photo-276459.html etc. at the very least these should be moved to the "chloanthite page" until they have been tested by microprobe.

I also suspect that many of the older specimens from Germany shown on Mindat as being nickelskutterudite are in fact "chloanthite". Of three samples of nickelskutterudite I have purchased from Germany only one proved to be nickelskutterudite the others were all skutterudite.
 
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