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Improving Mindat.orgChallacolloite crystal

19th Jul 2014 15:39 UTCReiner Mielke Expert

03999730016049736964171.jpg
http://www.mindat.org/photo-218647.html as far as I know based on the description in J. Schlüter, D. Pohl and S. Britvin (2005): The new mineral challacolloite, KPb2Cl5, the natural occurrence of a technically known laser material. N. Jb. Min. Abh. 182, 95-101. Challacolloite occurs as micro size intergrowths with cotunnite and not as euhedral crystals. I recently had a similiar crystal analyzed and it turned out to be Uklonskovite. Attached is the analysis of my sample:



These euhedral crystals occur in vugs between masses of cotunnite with challacolloite intergrowths associated with "rams-horn" and other odd shaped nitratine crystals. Embedded in the cotunnite-challacolloite intergrowths are pseudoboleite crystals which also occur as euhedral crystals in vugs. Other white minerals found in the vugs are fluorite, hemimorphite and quartz.


Unless the owner of this sample has some proof I would suggest changing this to Uklonskovite.

29th Jul 2014 15:37 UTCUwe Kolitsch Manager

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