- Krohnkite, Natrochalcite
- Toenail, 2.8 x 2.1 x 1.8 cm
- Chuquicamata Mine, Chuquicamata District, Calama, El Loa Province, Antofagasta Region, Chile
A rich, old-time and showy specimen of the rare sulfate, krohnkite, from the Type Locality, the Chuquicamata Mine of Chile. The piece is beautifully complimented by the very rare emerald-green sulfate, natrochalcite. Chuquicamata is also the Type Locality for natrochalcite. Without question, this specimen exhibits the most intense teal blue color I have ever seen in a natural mineral specimen and has great translucence! And the variation in blue color, in itself, is very noteworthy. The veins exhibit what is classic for the species, lamellar growth of crystals in parallel bundles. Ex. John White Collection of Seattle and accompanied by with an old, water-stained label.