Availability: 1 in stock
From the one time find (1966 by Miguel Romero) and the never again found obscure locality, this rare iron rich member of the tourmaline group is rarely seen in the market. This is the best one I have come across in 20 years.
Locality: Mexquitic, San Luis Potasi Mexico
Composition: Sodium Iron Aluminum Fluoro-boro-silicate