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Rare Mineral

Description Tabs

Poudrette Quarry, Mont Saint-Hilaire, Québec, Canada
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
1 × 1.5 × 0.5 cm
Largest Crystal: 

This is a small sample with crystals of intermediate korobitsynite-nenadkevichite composition. I have labeled them “korobitsynite” because in the EDS scan (posted under the “Analysis” tab), the Ti peak is higher than the Nb peak. However, you would need WDS – very expensive! - to actually prove that Ti > Nb. 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.

FOV in the close-up photos is 2.25 x 2.65 mm. Some of the crystals appear to be well terminated, though very small – ca 0.5  mm. The best crystals are at top center, but there are at least three other groups.

Single item shipping weight is 2.7 oz (77 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). 


Mineral Data
What's on the rock


Crystal System: 
Type Locality: 
Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia...
Analysis Report - only: Korobitsynite
LMB minerals

Seller Information

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Seller's terms and conditions

In addition to the standard terms and conditions, please note the following. Almost all IDs are visual. While in most cases the ID is obvious, there may be cases where it is not. If you are doubtful about a particular ID, please ask for more information. Or do not bid! Similarly, if you are not sure that the specimen meets your criteria, do not bid. I have tdone the best I can with the photos. Nevertheless, if you are not happy with a specimen for any reason, I will refund the bid price – but not the shipping costs (unless the fault is clearly mine) – if the specimen is returned. This policy applies even if analysis of the specimen shows that my ID was incorrect. When in doubt, ask - or don’t bid. Note that most crystals at MSH and Varennes are micros - even if on large specimens. Please pay attention to the stated sizes. Any customs duties, fees etc. are the responsibility of the buyer.