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Improving Mindat.orgStevensite?

8th Jul 2016 01:34 UTCReiner Mielke Expert

http://www.mindat.org/photo-666445.html and you know this is Stevensite because?

8th Jul 2016 01:53 UTCRob Woodside 🌟 Manager

message sent

8th Jul 2016 03:05 UTCKeith Compton 🌟 Manager

Certainly looks doubtful to me

Cheers


Keith

8th Jul 2016 17:15 UTCAndrew Debnam 🌟

Agreed-based on what?

8th Jul 2016 23:42 UTCRalph S Bottrill 🌟 Manager

Stevensite is usually a good bet for a clay mineral forming on serpentine, like this.

8th Jul 2016 23:56 UTCAndrew Debnam 🌟

It could a few different minerals - talc stained with a mud etc?

9th Jul 2016 00:08 UTCRalph S Bottrill 🌟 Manager

True, an XRD to test for smectites etc would really help.

9th Jul 2016 08:56 UTCMark Heintzelman 🌟 Expert

03501880016066991446037.jpg
This is not on serpentine, it's diopside from a skarn locality. No serpentine, nor is there any pillow basalt deposits present (common alteration product of pectolite).

No references to the species nor is it from an environment conducive to the presence/formation this species, (so far as has been observed to my knowlwdge) so yes, what justifies this I.D.?


Old nomenclature of particular interest to me, though not even likely a valid species in the smectite group. Here is a rare old sample I have from the type local, via Ward & Howell (circa 1875-1891) redefinition was never made on the labeling.





MRH

9th Jul 2016 23:44 UTCRalph S Bottrill 🌟 Manager

Oops, i should learn to read and not just look at the pictures! It could still be stevensite or saponite (essentially the same), but there are lots of possibilities.
 
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