Xenotime-(Y) crystal from a classic Norwegian locality, close to the type locality for the species. Some crystal faces can be observed. This old specimen comes from the Prieto collection (Madrid).

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Well-defined twinned microcline crystal from a very unusual locality, not seen in collections. It cbelongs from the collection of Peter Seroka, known for his interest in feldspars.

40 €

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This specimen from the Freiberg Bergakademie is accompanied by a very old label, probably from the early to mid-19th century, along with a more "modern" one. When in doubt about the description of the labels, we proceeded to analyze the specimen using SEM-EDS. By this spectroscopic technique we have been able to confirm that the beige crystals included in the piece are titanite. The white matrix corresponds to potassium feldspar, most likely microcline, and the black elongated prismatic crystals correspond to aegirine-augite. It is a historical specimen from a Norwegian locality known for centuries for mining magnetite in skarns. We will send all analyzes to the buyer.

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