Michael Spilde Yafeng Fu

Dear Mr. Karakus,

I suggest the search tools of the database "mindat". Based on your chemical composition you can get first and rough idea what mineral it con be.

Good luck !

H.G.Dill

The SEM spectrum and data looks more of barite than gypsum, however, this link may be of assistance

http://webmineral.com/data/Gypsum.shtml#.W3KcUE79dxs

http://webmineral.com/data/Barite.shtml#.W3KcTE79dxs

I am reluctant to hand down a remote-controlled verdict on a mineral analysis like that where neither the type of mineralization nor the measuring conditions are known.

Based upon the data it is celesto-barite with impurities.

H.G.Dill

Dear Mr Erhan,

The EDX analysis needs experience and care in analysis. For example, you need to make your spot analyses away from the mineral boundary to avoid getting mixed elements from more than one mineral. it would be good to show us the BSE image you did the analysis on and the location of your spot. Furthermore, take care of the little shift and overlaps between elements as you have Si and Sr in your image on the same peak. Silicon and Sr are very close to each others and in your case you might have a mixture of barite, gypsum, calcite, a form of poorly ordered aluminosilicate if the Sr peak is possible Si, but if not you may have a mixture of barite, gypsum, calcite and celestite. you also have small peaks not i

dentified.

Celestite with impurities and Ba ss; indeed SrLa almost coincides with SiKa, but the SrK lines appear clearly at higher energies. Some Th might be present (impurities, inclusions) because some peaks consistent with ThMa-b seem to show up, as does KKa. You must have an *.emsa file of the spectrum, isn't it? Some BSE images of the analysed field would also help a lot, though SEM/EDS investigations by themselves are short of being really diagnostic.

Erhan Karakuş Energy Dispersive Spectrometry of Common Rock Forming Minerals-Springer (2005)

dear professor i think these can be useful:

1- Modern SEM-based mineral liberation analysis

RolfFandrichYingGuDebraBurrowsKurtMoeller

International Journal of Mineral Processing

Volume 84, Issues 1–4, 19 October 2007, Pages 310-320

2- http://www.geo.umass.edu/courses/geo311/min%20chem%20analysis%20lecture.pdf

3-

SEM/EDX Studies on Association of Mineral Matter in Coal

R. RAMESHHenry Krumb School of Mines , Columbia University , New York, NY, 10027, U.S.A. &P. SOMASUNDARANPages 93-99