30/07/2021
Super rare combination of Thomsonite pseudomorph (after Nepheline) and Diopside from Seiland, Finnmark, Norway found in the late 1980's by my father.
Size: 109x69x73 mm (854 gr.)
Not for sale, and it's in my private collection.
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.
It is a very rare combination, and my father found just a few ones like this. I have now got it proven by 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
I got a few others from this material that I will put up for sale, but only 1 with this quality.
It was found in the mountains of Bumannsfjord. 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, also it will not be collected any more of it.