Turquoise (var: Rashleighite) (ex Kay Robertson Collection)

Item Description

A cool old Cornish specimen of Turquoise (var: Rashleighite). Originally Rashleighite was a valid species, now defined as an iron-bearing Turquoise and an intermediary between Chalcosiderite and Turquoise. This piece features beautiful sky blue patches of this Turquoise varietal which have formed on Quartz matrix. Very hard to find on the market, and a must-have for any collection of minerals of Cornwall or a general phosphate collection. Ex Kay Robertson Collection (#5252). 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).