Diopside (rare locale) (ex Kay Robertson Collection)

Item Description

Diopside is well known from different worldwide environments, but crystals from this marble quarry in Jefferson County, Montana are not common. This piece is a beautiful group of medium green to deep forest green prismatic crystals from the Boulder Batholith. The piece is crystallized on the front and back with sharp, lustrous, well-defined faces, and actually will pass a tiny amount of light when backlit. Ex Kay Robertson Collection (#12762). 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 Velt" November-December 2017).