File:Niveolanite-563473.jpg

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English: Niveolanite
Locality: Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada
Fibers to 2½ mm. Found July 2002. MOB coll. This is the only niveolanite specimen that I found myself. (But didn’t really “find” it until a few days ago when rummaging through “UK” boxes.) As niveolanite goes, it isn’t the best example (though it’s not bad). And this isn’t the best spot on the specimen. But it is of interest because it shows both long fibers – typical of niveolanite – and short fibers – which look a lot like some fibrous dawsonite. But it is all niveolanite. Both the long and short fibers dissolve in HCl with bubbles – but very slowly. Even a small piece takes a few minutes to dissolve completely. Whereas dawsonite – of which there is actually quite a bit on the specimen, but in a powdery rather than fibrous form – takes off like a rocket when plunked in the acid. Just like calcite. The specimen has not been analyzed, but the “slow fizz” is what one expects for niveolanite. Also, while there are many fibrous white minerals in the pegmatites at MSH, only micheelsenite, fibrous dawsonite and thaumasite (all of which are "fast fizzy") and perhaps mazzite-Na (which is not fizzy at all) could really be confused with niveolanite’s curly fibers. The environment (Poudrette pegmatite) also helps to pin it down. The only potential confusion is with lecoquite-(Y) and (to a lesser extent) adamsite-(Y). However, both of these dissolve rapidly with effervescednce in HCl. They also exhibit REE absorption lines (although I don't personally have a verified lecoquite to check against). The environment - Poudrette environment - is another aid in identification. Furthermore, note that niveolanite and lecoquite, while both from this pegmatite, are from distinctly different parts and, as far as I know, have not been found together. For a full list of associated minerals, see the respective articles by Pekov et al. Incidentally, if you think that adamsite-(Y) is fragile, you should try niveolanite. Some of the larger fibers are flexible but the acicular stuff is extremely brittle. And it’s potentially toxic too. Waving it around may not be a good idea! There is a stereo child photo. Modified by CombineZP
Deutsch: Niveolanit
Fundort: Grube Poudrette, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Kanada
Fasern bis 2½ mm. Gefunden im Juli 2002
Date
Source https://www.mindat.org/photo-563473.html (Mindat-ID Y8L-JAV)
Author Modris Baum

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Public domain This work has been released into the public domain by its author, Modris Baum. This applies worldwide.
In some countries this may not be legally possible; if so:
Modris Baum grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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current15:36, 14 July 2019Thumbnail for version as of 15:36, 14 July 20193,040 × 2,436 (1.71 MB)Ra'ike (talk | contribs)== {{int:filedesc}} == {{Information |Description= {{en|Niveolanite, Franconite (FOV 6.0 x 4.7 mm) ::Locality: Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada ::Fibers to 2½ mm. Found July 2002. MOB coll. This is the only niveolanite specimen that I found myself. (But didn’t really “find” it until a few days ago when rummaging thro...

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