Opal Var. Hyalite – Tarcal, Kopasz, Hungary

 Opal Var. Hyalite from the rarer locality in Hungary!
 This large, highly lustrous, and spherical hyalite grows like a crown on its black matrix. This mineral usually occurs as a crust; only rarely do the crystals build up into such a large and aesthetic structure as here.
 This variation of opal is highly fluorescent. An undamaged, rare collector's piece from Hungary with good luster.