Boleite on Atacamite, Selenite
Amelia Mine, Boleo District, Municipio de Mulege
9.3 x 8 x 4.2 CM (cabinet)
A fine, huge Boleite crystal showing interpenetration (twinned?) on contrasting matrix. From the recently released stash (2018) of material from the classic Amelia Mine, these were a big surprise in Tucson and were quickly sold out. This is an especially choice piece of this rare mineral with a giant 1.4 CM crystal that is well exposed. Better in person the matrix has been stabilized as is normal for all these since as this matrix is very fragile. The green surface is composed of tiny Atacamite grains that are naturally cemented on the matrix, which is mostly Selenite but also has a few chunks of Anglesite embedded as well. Matrix pieces with this quality and size have not been available for many years.