Coeruleite and Mansfieldite crystals from the Mina El Guanaco, Chile, Gerd Tremmel collection – miniature specimen as unique piece
This miniature specimen displays an intense light blue to turquoise surface typical of Coerulite. The matrix is almost completely covered by fine-crystalline, velvety coatings. The crystals are very finely developed and form dense, compact aggregates that give the specimen a homogeneous and vividly colored appearance.
In the center, a slightly differently colored rounded area is visible, contrasting with the blue base and indicating the association with Mansfieldite. Individual crystal faces are only visible upon close inspection, yet the crystalline character is clearly recognizable. The strong natural coloration makes this miniature specimen an attractive collector’s piece from a classic South American phosphate locality.
Geology & Origin
Coerulite is a rare copper aluminium phosphate, while Mansfieldite is an iron-bearing aluminium phosphate. Both minerals form as secondary phases in the oxidation zone of phosphate-rich deposits. Mina El Guanaco in Chile is known for a wide range of rare phosphates that developed under arid climatic conditions. The intense blue coloration of Coerulite is caused by its copper content and commonly appears as compact, fine-crystalline crusts on the matrix.