Just starting to get some of the material I collected at Tolbachik in July properly analyzed - XRD and probe. Here are a couple of photos of things now known, and some intriguing as yet unidentified material. The abundant green ball like aggregates in photo 1 have just been confirmed to be lammerite-beta, a copper arsenate. There are (at least) three other minerals on the piece - the bright green ball like mass near top right is, I suspect, popovite, and the fibrous green material is probably alumoklyuchevskite, but this needs confirming. There is also an unknown sky-blue mineral hiding in a couple of cavities. The purple-blue mineral in photo 2 is bradaczekite, and the abundant small violet spots scattered all over it are johillerite. The white mineral as well as the dark grey material are as yet still unidentified, as are some beige prismatic xls that occur on other specimens of this material (but not on this particular piece, I am afraid). Photo 3 shows (at least) two as yet unidentified minerals from a new locality at Tolbachik. I suspect that the brown xls may be nabokoite, The yellow one does not seem to match anything I can find listed from Tolbachik, so is a complete mystery. FoV for the first two images is about 5mm, and about 3mm for the last one. So, the xls are quite large, considering - the Handbook of Mineralogy for example says that beta-lammerite only occurs as scattered grains to
Posted on: Wed, 12 Nov 2014 22:21:24 +0000
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