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Richelsdorfite from the type locality

Posted by Reiner Mielke  
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Reiner Mielke November 14, 2017 04:28PM
https://www.mindat.org/loc-1830.html A few years ago I purchased a sample of "Richelsdorfite" and just recently had it analyzed. Much to my surprise it was not richelsdorfite rather strashimirite. https://www.mindat.org/photo-395257.html Most of the richelsdorfite photos from there look a lot like my sample and I am wondering if they are also incorrectly identified. So now I am looking for a richelsdorfite sample but am leery of anything from there. For that mine is there anyway of telling them apart without analysis?
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Pavel Kartashov November 14, 2017 05:03PM
Quite usual thing. I always supposed, that "sanbornite quartzites" are composed by sanbornite and quartz. :-)))

Recently I received some samples from Esquire #8 claim and decide to check fresnoite from them. As result the main constituents of the white matrix rock turned out diopside (about 60-70 wol.%) with minor celsian and witherite and very minor sanbornite (may be 1-2 wol.% of 300 g sample).


Central bright fresnoite crystal is surrounded here by two medium bright celsian plates (left-right) and two dark diopside xls (top-bottom) with minor particles of brightmost witherite.
This diopside contains Fe (4.2 mas.% FeO) and Mn (2.2 mas.% MnO) but still is snow-white.


All must to be checked.



Edited 1 time(s). Last edit at 11/14/2017 05:07PM by Pavel Kartashov.
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Reiner Mielke November 14, 2017 06:18PM
Very interesting Pavel. It may be that diopside is much more common than thought. However I would have thought the perfect cleavage, pearly luster, and hardness of sanbornite would have easily distinguished it from diopside. Do you have a picture of the whole sample we could see?
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Pavel Kartashov November 15, 2017 03:54PM

These lemon-yellow narsarsukite-like grains are fresnoite within diopside-celsian matrix.


This is view of whole specimen. Its the right part is composed by compact walstromite layer (with positive relief, some more white). Minor micaceous sanbornite flakes are visible along the upper edge of the sample (especially at right end).
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Reiner Mielke November 15, 2017 04:03PM
It does not look like the sanbornite specimens I have from there. It would definitely make me suspicious.
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Uwe Kolitsch November 15, 2017 04:42PM
Richelsdorfite vs. strashimirite.
At high mag, it should be relatively easy to distinguish them. Rich. is always platy and bluish, strash. is always pale greenish to nearly white and fibrous. You might have both on your specimen.
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Reiner Mielke November 15, 2017 05:32PM
Thanks Uwe, I will have a close look to see if I can see something platy.
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