Lorenzenite is uncommon, but not really rare, at MSH. The crystals on this specimen are fairly robust for MSH. Larger ones have been found, but I have not seen any. These are best crystals that I have. They fluoresce a fairly strong yellow under SW UV. At MSH, this is a distinguishing characteristic for lorenzenite vs vinogradovite.

The first photo shows the best aggregate on the specimen. The longest terminated crystal is about 3.7 mm long.

The next pair of photos (FOV 3.3 x 4.2 mm) is a different, slightly broader view of the same crystals.
The following pair of photos (FOV 6.5 x 4.2 mm) is a still wider view showing some of the other aggregates.

Another group of crystals is shown in the next pair of photos (FOV 2.4 x 2.7 mm). The longest crystal here is ca 2.0 mm.

Yet more crystals (to ca 2.5 mm) are shown in the next pair of photos (FOV 2.4 x 3.2 mm)

I don’t know what the white stuff shown in the center of the full-view photo is. It doesn’t look like dawsonite and I think that thermonatrite (etc.) would be out of place in this environment. 

Singe item (small box) shipping weight 2.4 oz. For shipments outside the USA, up to a total weight of 8 oz (225 g), this could be combined with other items from this or future auctions for the same postage. If you wish to keep an “open box”, let me know.

For shipments within the USA, there is a nominal increase of about $0.20 for each additional ounce. Above 13 oz I will use “own box” Priority Mail ($8.75).