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Improving Mindat.orgWondering about this roscherite - Tip Top Mine

15th Mar 2016 15:27 UTCJeff Weissman Expert

This image of sharply crystallized roscherite, http://www.mindat.org/photo-289372.html, does not fit the description or color (assuming color balance of image is correct) of roscherite from Tip Top, they are usually reddish to lilac with a purplish tone, occuring in rosettes and rounded aggregates of platy crystals, or rarely dark olive-green crystals.


This crystal strongly resembles pararobertsite to me (could also be robertsite) in terms of habit and color - see http://www.mindat.org/photo-437051.html, although this is a sharp crystal and not a compound crystal in my image, although I have seen simple crystals of similar habit and color in my specimen as well - the simple (not compound) xls tend to look a lot like robertsite, though.


http://www.mindat.org/photo-684648.html has the crystal form and color that one habit of rocherite from Tip Top.


EDS is likely not to be sufficient to distinguish roscherite (Ca2Mn5Be4(PO4)6(OH)4.6H2O) from robertsite or pararobertsite (Ca3Mn4(PO4)3O2.3H2O), unless a careful quantitative analysis is taken, due to background interferences and changes in energy intensities due to uneven surfaces, etc...


Thoughts on this?

15th Mar 2016 16:13 UTCUwe Kolitsch Manager

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