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Modris Baum's Photo Gallery

9HD-1CTBavenite : Ca4Be2+xAl2-xSi9O26-x(OH)2+x, (x=0-1)

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 2.4 mm
Largest Crystal Size: 1.1 mm

From a marble xenolith, associted with pectolite, small medium-green "arfvedsonite" (probably magnesio-) prisms, and tiny pseudo-cubo-octahedral apophyllite - as is typical at MSH.

There is a stereo child photo.
Photo ID: 896077     Uploaded by: Modris Baum   View Count: 5   Approval status: Public galleries    Type: Photo - 703 x 1024 pixels (0.7 Mpix)

W5C-TNPPyrochlore Group : A2Nb2(O,OH)6Z, Catapleiite : Na2Zr(Si3O9)·2H2O, Aegirine : NaFe3+Si2O6

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 3.55 mm

Another black pyrochlore from the same find as [https://www.mindat.org/photo-183449.html], this one a bit > 0.5 mm on edge, directly associated with white catapleiite (0.6 mm) and aegirine. For more on the catapleiite and other associated minerals, see the “related” photos.
This type of pyrochlore has not been analyzed (by me). The two confirmed “pyrochlore” species at MSH are fluorcalciopyrochlore and fluornatropyrochlore. Analysis of a (probable) fluorcalciopyrochlore from another find [https://www.mindat.org/photo-299374.html], showed very high levels of Si – apparently a common thing at MSH. In this case, I would not be surprised to see a lot of Th - just a guess.
Photo ID: 874181     Uploaded by: Modris Baum   View Count: 19   Approval status: Public galleries    Type: Photo - 1024 x 603 pixels (0.6 Mpix)

W5C-TNPCatapleiite : Na2Zr(Si3O9)·2H2O, Aegirine : NaFe3+Si2O6

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 6.85 mm
Largest Crystal Size: 0.9 mm

Catapleiite “butterflies” on aegirine “twigs”. These are very small "butterflies". The largest “wingspan” is ca 1.2 mm.

The catapleiite is associated with black “pyrochlore” similar to [https://www.mindat.org/photo-183449.html]. It is from a find that also had thin tabular rhodochrosite of a very similar habit [e.g. https://www.mindat.org/photo-163671.html]. But this isn’t just “washed-out” rhodochrosite. Slightly larger crystals on this and other specimens [e.g. https://www.mindat.org/photo-455677.html] look like typical catapleiite and there is a continual transition from these smaller crystals to the larger ones.

Also in this find was a great deal of more typical “pyrochlore” [e.g. https://www.mindat.org/photo-312834.html] and an unidentified murmanite group mineral. See [https://www.mindat.org/photo-571112.html].
Photo ID: 874026     Uploaded by: Modris Baum   View Count: 35   Approval status: Public galleries    Type: Photo - 1024 x 685 pixels (0.7 Mpix)

9TN-LGQNormandite : NaCa(Mn,Fe)(Ti,Nb,Zr)(Si2O7)OF

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 2.9 mm
Largest Crystal Size: 1.1 mm

This is a somewhat unusual example of small, but free growing, crystals of normandite. The saample was conformed via qualiative EDS (to the extent that that is possible). See the child analysis "photo".
Photo ID: 868519     Uploaded by: Modris Baum   View Count: 28   Approval status: Public galleries    Type: Photo - 1024 x 803 pixels (0.8 Mpix)

EA0-QUXAdamsite-(Y) : NaY(CO3)2·6H2O, Franconite : NaNb2O5(OH)·3H2O, Synchysite-(Ce) : CaCe(CO3)2F, Rhabdophane-(Ce) : (Ce,La)(PO4)·H2O

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 3.05 mm

This is a good example of terminated adamsite-(Y) (top) with franconite (bottom-center). The franconite "puff-ball" is ca 1.1 mm in diameter.The off-white flaky stuff in the bottom right corner is a pseudomorph of synchysite-(Ce) with some rhabdopahne-(Ce) (or perhaps monazite-(Ce)) after an unknown precursor (not petersenite-(Ce). (See one of the "related" analysis photos for an EDS scan for the PSMs.)

In addition to the adamsite-(Y), this interesting specimen also host two other type locality minerals: thomasclarkite-(Y) and niobokupletskite (on kupletskite). These are shown in various "realted" (same minID) photos. There are also several other child photos showing more of the adamsite on the specimen.
Photo ID: 868492     Uploaded by: Modris Baum   View Count: 32   Approval status: Public galleries    Type: Photo - 1024 x 696 pixels (0.7 Mpix)

EA0-QUXThomasclarkite-(Y) : (Na,Ce)(Y,REE)(HCO3)(OH)3·4H2O, Synchysite-(Ce) : CaCe(CO3)2F, Rhabdophane-(Ce) : (Ce,La)(PO4)·H2O

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 3.7 mm

This photo shows a twin (or group) of thomasclarkite-(Y) crystals along with a "flaky" pseudomorph of synchysite-(Ce) with some rhabdophane-(Ce) (or perhaps monazite-(Ce). The precursor is not known. These PSMs are mostly thick tabular. They do not look like the PSMs after petersenite-(Ce) which were much more common in the Poudrette pegmatite. See the analysis child photo.

Also on this specimen are two other type locality minerals: adamsite-(Y) and niobokupletskite. And there is also a bit of franconite. These minerals are shown in the "realted" photos posted under the same minID.
Photo ID: 868489     Uploaded by: Modris Baum   View Count: 31   Approval status: Public galleries    Type: Photo - 1024 x 627 pixels (0.6 Mpix)

EA0-QUXNiobokupletskite : K2NaMn2+7(Nb,Ti)(Si4O12)2O2(OH)4(O,F), Kupletskite : (K,Na)3(Mn,Fe)7Ti2Si8O26(OH)4F

Multiple photos available
Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 2.45 mm

This example of niobokupletskite has been verified (to the extent possible) via qualitative EDS. It is "typical" in that it occurs as an overgrowth on much darker kupletskite (which, however, was not analyzed). See the analysis child "photo".

The niobokupletskite is part of a very interesting specimen also hosting two other typelocality species: adamsite-(Y) and thomasclarkite-(Y). In addition, there is a small amount of franconite and several PSMs of synchysite-(Ce) with rhabdophane-(Ce) (or perhaps monazite-(Ce)) after an unknown blocky precursor (not the usual petersenite-(Ce)). Photos of these minerals, as well as an EDS scan for the synchysite PSMs are posted as "related" photos.
Photo ID: 868485     Uploaded by: Modris Baum   View Count: 37   Approval status: Public galleries    Type: Photo - 1024 x 681 pixels (0.7 Mpix)

DL6-GPCLabuntsovite Supergroup

Poudrette quarry, Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada

Field of View: 1.1 mm
Largest Crystal Size: 0.85 mm

This could be korobitsyinite, tsepinite-Na - or just plain old nenadkevichite. Qualitative EDS shows a Ti peak substantially higher than the Nb peak. Taken literally, that would imply korobitsynite or tsepinite-Na (which are chemically identical). But qualitative EDS can be misleading becuase Ti is detected more readily than Nb and because peak heights can depend on other factors besides the chemical composition.

In my own little world, I think this is korobitsynite, but I have posted it very conservatively here as "labuntsovite supergroup". Only WDS + XRD could say for sure. Not in my budget.

See the analysis "related" photo for the EDS scan. (There are also several other photos of this specimen that were posted as "nenadkevichite group". Strictly speking, tsepinite-Na doesn't belong to that group.)
Photo ID: 861107     Uploaded by: Modris Baum   View Count: 27   Approval status: Public galleries    Type: Photo - 1024 x 775 pixels (0.8 Mpix)

J80-97WNenadkevichite : (Na,◻)8Nb4(Si4O12)2(O,OH)4·8H2O

Multiple photos available
Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada

Field of View: 1.2 mm
Largest Crystal Size: 0.3 mm

These crystals are very tiny, so the photo isn't very sharp. But I like the habit.

There is a stereo child photo that makes things look a bit sharper.

Photo ID: 861100     Uploaded by: Modris Baum   View Count: 34   Approval status: Public galleries    Type: Photo - 878 x 1024 pixels (0.9 Mpix)

6RX-7JXVilliaumite : NaF

Multiple photos available
Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada

Field of View: 3.15 mm
Largest Crystal Size: 1.0 mm

Villiaumite is a rare mineral in the Saint-Amable sill. Mostly it occurs as cavity fillings, anhedral grains, or, at best, crude, etched/leached, crystals with an occasional face here and there. This is the best crystal that I have ever seen from here. It isn't perfect, but it is in pretty good shape and is even lustrous. (The dark zig-zag on the most lustrous face is actually a reflection even though it looks like a shadow in the photo). I don't think that any of the faces are cleavages.

According to the Min Rec special issue on this quarry (March/April 1998), villiaumite was first found here ca 1994. This specimen was found in November 1999, but I only noticed this particular crystal recently. As in the 1994-6 find, assocaited minerals include serandite, eudialyte, zakharovite, aegirine and natrolite, but there is no varennesite, makatite, or vuonnemite. Instead, there is (locally) abundant nenadkevichite, yofortierite and/or tuperssuatsiaite (none of these on this specimen) and a couple of unidentified mineras (including the yellowish stuff shown in the photo) currently awaiting EDS. For Demix-Varennes, this was a very rich find of villiaumite.

Photo ID: 860946     Uploaded by: Modris Baum   View Count: 26   Approval status: Public galleries    Type: Photo - 1024 x 751 pixels (0.8 Mpix)
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