Labuntsovite-Mn is a fairly rare mineral at MSH, found mostly in the igneous breccia and marble xenoliths. This is a small, but “cute”, example from very small cavities in nephelene syenite (NS), which seems rather unusual. (Possibly it is from a breccia with large fragments of NS.)  

The labuntsovite is associated with tiny crystals of calcite and “bow ties” and “pom-poms” of natrolite. (The latter were analyzed via PXRD because another mineral was suspected.) The first pair of photos (FOV 1.9 x 2.1 mm) shows a labuntsovite crystal, ca 0.85 mm tall, whose termination is topped by a “pom-pom” of natrolite. It looks better though a scope, but you need at least 20X to view it.

The second pair of photos (FOV 1.8 x 2.05 mm) shows a well-terminated crystal ca 1 mm tall.

The third pair of  photos (FOV 1.9 x 2.7 mm) shows a larger (1.5 mm) crystal. Unfortunately it grew wall-to-wall, so there are no terminations.

Single item shipping weight is 3.1 oz (88 g). For shipments outside the USA, up to a total weight < 8 oz (225g), this can be combined with items from this or other auctions for the same postage.

Within the USA, postage increases by about $0.20 per ounce. Above 13 oz, I will use Priority Mail ($9.25 including packing).