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24 cm Diopside, Thomsonite from Seiland
$324.99
ID20894
Location:
Bumannsfjorden, Seiland, Finnmark, Norway
Size: 104x240x164 mm (4830 grams)
Description
Great speciment, and the best Thomsonite specimen I have for sale.
One half of the specimen is massive light pink Thomsonite, the other half is green Diopside crystals with some cola-brown Grossular crystals. The quality is pretty good, see pictures for details. The first pictures are taken with extra light to expose the crystals and colors. The last 2 pictures are taken in normal daylight.
Thomsonite pseudomorph
It is a very rare combination, and my father found just a few ones like this. I have now got it proven by a lab that it is in fact Thomsonite. You can also see the mineral listed at Seiland at Mindat: https://www.mindat.org/loc-341193.html
In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form (crystal system), resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another.
Bumannsfjorden, Seiland, Finnmark, Norway
Most of the year the field where the minerals are found is covered with ice and snow, and today this area is now a part of the Seiland National Park, and collecting from this area is now strictly forbidden. So not only is this a rare material but also it will not be collected more of it.
This specimen was found in the late 1980's by my father, Gunnar Mathisen.
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