BLP27 Cronstedtite

Siglo XX Mine, Near Llalagua, Oruro Dept., Bolivia

5.3x 2.5x 1.7 cm

$90

A rare specimen of cronstedtite from the Llallagua Mine.  I purchased these from a miner at the locality in 2008.  This is a very rich example of this serpentine group species, something that really does not turn up often.

I have seen them for sale only a couple times, from Bolivia and Romania.  As a side note, this species simultaneously contains two oxidation states of iron.