Chabazite-Na is a rare mineral at MSH – except in the core of the Poudrette pegmatite, which probably produced more than 99% of the chabazite-Na at MSH (László Horváth -private communication.) As attested by the associated horváthite-(Y), this specimen is from that core. It is very rich in chabazite-Na.
Moreover, EDS (see the “Analysis” tab), strongly suggests that this is chabazite-Na rather than gmelinite-Na, despite the fact that, as shown in the first photo (FOV 6.4 x 4.0), the cahabazite occurs in rosetttes of distinct platy crystals. Usually, when one sees platy zeolite rosettes at MSH, one is looking at gmelinite-Na. However, while EDS is generally not a definitive way to ID zeolites, the scans (especially the second one), seem rather indicative in this case.
The first scan is from the area shown in the first photo. There is some Ca, making the chabazite-Na ID a bit ambiguous. The second scan is from an area of “golf ball” chabazite-Na more typical of MSH. The scan for this area is also more like what one would expect for chabazite-Na – no Ca at all. (The Cl may be residue from an ill-advised HCl test.)
The horváthite-(Y) spray in the Z photo is a bit > 4 mm. It is not the best of horváthites – about half of the top is bruised. (The good side is facing the other way. But I don’t think it would be possible to make this side visible without breaking the horváthite.)
To compensate, there is a great deal of chabazite-Na – otherwise a very rare mineral at MSH.
Most of the chabazite is so tightly packed that the edges of individual platy xls are barely discernible. Numerous “golf ball” like aggregates are shown in the three macro photos. The arrow points to the horváthite-(Y).
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