Polycrase-(Y) (rare multiple oxide) Vajdak Coll.

Item Description

Polycrase-(Y) is a rare multiple oxide containing Y, U, Ti or Nb and is mainly found in pegmatites. Specimens labeled as being from this obscure locality may be from a pegmatite district around the cities of Rio Pomba and Uba (MINDAT). Specimens of any species are rare from this district. This is a stout, terminated, euhedral, prismatic crystal with an orangish-brown oxidation rind. The minimal bruising reveals the high waxy luster and moderate translucence of the chocolate-brown crystal with orange highlights. Very rare on the market. Ex Josef Vajdak Collection. Value of such a rarity??