This specimen is rich in both lustrous, water clear, colorless, leucosphenite and typical,
silvery-gray, monteregianite. There are five arrows pointing to the largest leucosphenites, and two arrows pointing to monteregianite. But there are additional, unmarked groups of both species on the specimen. You will need 10-20X to view them.

The main photo shows a cavity with more than a half dozen leucosphenite xls to > 3 mm. The top xl (probably an aggregate) has some damage on one side (bottom left), but otherwise the xls are in very good shape and are well terminated.

Some of the monteregianite and more leucosphenite are shown in the other photos (for which I have supplied separate scale information.)

There are also a few tufts of tiny, pale pink vinogradovite/lorenzenite (last close up). At MSH, lorenzenite usually fluoresces yellow, vinogradovite does not. I did not see any UV response in this case, but the xls are too small to be sure.

In addition to these “goodies”, there is a “baddy” – stuff that looks like yofortierite or tuperssuatsiaite, but is almost certainly an amphibole. (I was not able to add another photo showing this stuff, but see for example [http://www.mindat.org/photo-192417.html] etc.)

Associated minerals are aegirine and/or “arfvedsonite”, blocky albite, very etched smoky quartz, microcline, nondescript, mousy looking, fibrous pectolite, and very minor molybdenite..

This specimen is from an igneous breccia.

Conceivably, it could be split into several micros – but why?