Rhodochrosite on Hisingerite (RARE) Rapp & Robertson Coll.

Item Description

Hisingerite is a rare amorphous to poorly crystalline hydrated iron-3 layer silicate. Specimens are rare from Santa Eulalia, but when found, are generally as a subtrate to botryoidal or crystallized rhodochrosite. A rich 3-dimensional crust of spherical aggregates of sparkly pastel-pink rhodochrosite micro rhombs is underlain solidly with lustrous layered reddish-brown hisingerite. Formerly in the Floyd Rapp Collection. Ex Kay Robertson Collection # 1856 and acquired from Scott Williams in February, 1961. 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). A rare, showy and excellent combination and very seldom on the market from the well-known Potosi Mine.