Large Cryolite (Type Locality) w/ Siderite & Chalcopyrite (David Burgess Coll.)

Item Description

An impressive large cryolite specimen from the famous extinct Type Locality in Greenland. Massive white cryolite hosts typical accessories of cleavages of brown siderite rhombs and bright golden chalcopyrite, especially on the striking back side. This rare Na-Al halide was originally used as aluminium ore and later in the electrolytic processing of the aluminium ore bauxite. A large, rich and highly representative example of this rare species in combination. Old material, mostly from the 1800s and early 1900s. Modest interesting peach-colored fluorescence. Ex David Burgess Collection, for whom Burgessite is named. 5.7 pounds or 2.6 kilos mass.