As corundum goes, this is – ahem - “less than impressive”. In fact I didn’t believe the allegation, so I had it analyzed via EDS – which said “corundum”. (See the “Analysis” tab. Note that O is invisible in such scans.) Corundum is a very rare mineral at MSH, but even here, there are probably better examples. However – to state the obvious – this one is for sale. And it has been analyzed. 

The two close-up photos (FOV 2.05 x 1.8 mm) use different lighting, but I can’t say that either photo manages to make the corundum (0.75 mm) look like corundum. What else lives at MSH and consists only of Al and elements lighter than Na (which can’t be seen by this type of scan)? Only the Al hydroxides such as gibbsite et al. Cearly, this isn’t one of those.

Single item shipping weight (with MM case) is 2.8 oz (78 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 (ca $9.25 including packing – varies by destination).