Osumilite

Osumilite

This Osumilite sample comes to us from Lane Co., Oregan.  I think it may be Osumilite-(Mg) a rare form of the a rare mineral.

Osumilite

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30  Osumi, Japan is the type locality and it was discovered in 1953.  Osumilite-(Mg) is a hexagonal variant of Osumilite fully approved as a valid species in 2011.  The two species are difficult to distinguish from each other.  

Osumilite

I hope that you can see from the above photo that the mineral is located in a vug.  It's the bottom large mass.

You may remember seeing some of these on my blog previously.  In this shot, the sample is turned an angle which does not lend itself to our seeing the mineral well.

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