MSH is the type, and only known, locality for monteregianite-(Y). It is not common here.

This is a micro. The visible part of the larger crystal in the first pair of photos (FOV 2.2 x 2.8 mm)  is 1.1 mm. You will need 20-30X to view it. This crystal has a strange termination. The “slant” face is very smooth. But it is not a typical monteregianite face. Monteregianite does have one perfect cleavage and one very good one, but his face doesn’t seem to correspond to either of those, so I’m not sure how to interpret it. As may be clearer from the third photo, there are actually two “slant” faces on the termination. In any case, bid on it “as is”. These “faces” may or may not be true faces. Possibly they were contacts with something that has been removed.

There are several other “normal” xls on the specimen, but they are all < 1 mm. They can be seen in parallel growth near top center in the first pair of photos.

The matrix is acicular pectolite and calcite with very small quartz xls coated white. I don’t know what the coating is.

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