Chrysocolla (var: Cornuite) (ex Kay Robertson Collection)

Item Description

Cornuite was originally a valid species, and described as an "Amorphous equivalent of chrysocolla". Today is it a variety of Chrysocolla, and the name is rarely seen in literature. This piece features attractive botryoidal groups of brownish-olive-green colored "Cornuite" sitting atop a more vivid green layer of Chrysocolla on matrix. An odd and hard to find specimen from the classic 79 Mine, and certainly worth picking up if you collect secondary ore minerals or minerals of Arizona. Ex Kay Robertson Collection (#1041). Kay is a prominent California collector, who specialized in European classics (see the article in the March-April, 2007 Mineralogical Record and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017).