The rocks are highly brecciated, ferrugenised and silicified.
besides other alterations fracture filling minerals are present that give variable chemical compositions.
Because of ferrugenisation staining is not taking properly
the altered/ friable nature more over ferrugenisation making it difficult get good polished thin sections
how do I solve this problem?
Dear Dr. Latha:
To cut it short. Please find attached a file which may be an answer to your question.
With kind regards
H.G.Dill
May I recommend the following two works on carbonatites:
Bell, Keith, ed., 1989, Carbonatites—Genesis and evolution: Boston, Mass., Unwin Hyman Ltd., 618 p.
Berger, V.I., Singer, D.A., and Orris, G.J., 2009, Carbonatites of the world, explored deposits of Nb and REE—Database and grade and tonnage models: U.S. Geological Survey Open-File Report 2009-1139, 17 p. and database, available at
http://pubs.usgs.gov/of/2009/1139/
For mounting brittle samples, may I furthermore recommend my paper (May 2015) on:
'Preparation methods in Mineralogy & Geology: The Preparation of thin sections, polished sections, acetate foil prints, preparation for elutriation analysis, and staining tests for the optical and electron microscopy.' available here in my researchgate-contribution list.
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Dear Dr. Latha:
To cut it short. Please find attached a file which may be an answer to your question.
With kind regards
H.G.Dill
If your problem is the natural weathering of the sample, and you have reasons to believe that the rock is less altered/weathered at depth, you may take samples at some depth with a mine mechanical corer (or another coring system suitable to drill to the depth of unaltered rock).
Actually the samples are Borehole core samples even at depth of > 100m. they are like that. Its not weathering phenomena. Its a mix of deformation and Hydrothermal alterations that changed the original mineralogy and texture.
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