This is a small sample with crystals of intermediate korobitsynite-nenadkevichite composition. I have labeled them “korobitsynite” because in the qualitative EDS scan (for another specimen - see the “Analysis” tab), the Ti peak is higher than the Nb peak. However, Ti is more readily detected than Nb, so you would need WDS – very expensive! - to actually prove that Ti > Nb. Also, in the holotype material, the Ti:Nb ratio was ~ 3:1. Hence “korobitsynite” is a tentative ID. The crystals could also be zoned, with some parts being korobistynite and others nenadkevichite. As far as I know, there was only one find of korobitsynite at MSH that has been rigorously verified. This specimen is not from that find. However, that doesn’t mean that it can’t be korobitsynite. It simply isn’t practical to thoroughly analyze every likely sample. In any case, korobitsynite is very rare at MSH and is only known from a handful of localities world-wide, so this is a very interesting specimen.

The crystals are very small and may not be easy to spot at first. I have plastered the specimen with half a dozen arrows pointing to some of them. There are many others.

FOV in the first photo is 0.8 x 1.1 mm. The crystal is 0.6 mm tall. You will need 30-50X to see it clearly.

The next pair of photos (FOV 1.8 x 1.9 mm) shows several crystals ca 0.5 mm. I am not sure if the dark crystal is an amphibole or aegirine.

Single item shipping weight (no case) is 3.3 oz (94 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 for total weights up to 13 oz, ranges from $4.25 to $6.50 (including packing etc) regardless of destination. Above 13 oz, I will use Priority Mail ($7.25 - $9.20 including packing – varies by destination).