Sphalerite w/ Fluorite & Galena ex Univ. of Sonora Coll.

Item Description

A VERY SHOWY and EXCELLENT combination specimen from Naica, Mexico. Lustrous, black sphalerite crystals to 2.7 cm with SUPERB, trigonal growth faces are aesthetically set on matrix with glassy, colorless, cuboctahedral fluorite crystals and a well-placed, 2.7cm, partially skeletal, galena crystal. SELDOM do you know the exact mine from this famous district. However, this Mullane Collection specimen comes with a University of Sonora Engineering School label, that tells us the mine, which is VERY UNCOMMON - the Siglo XX. Value of such a well-documented, excellent, older combo piece??