Chabzaite-Na is a very rare mineral at MSH, except in the core of the Poudrette pegmatite, where it was locally abundant. This is a very rich example from that environment. Perhaps 50% (or more) of the specimen consists of chabazite-Na. The matrix is mostly albite with some analcime and very minor siderite and gonnardite/natrolite. There is also at least one, very small, gobbinsite aggregate. The chabazite consists of both very tightly packed  spheroidal aggregates and more attractive “open” rosettes. The photos show some examples of the latter. There are many others. The material was confirmed as chabzite via EDS and PXRD on another specimen from the same part of the pegmatite. (See the “Analysis” tab for the EDS scan.)

FOV in the first pair of photos is 2.4 x 3.5 mm. The chabazite “rosettes” are ca 1.5 mm in diameter with individual discs to 1.2 mm.

The third photo (FOV 3.7 x 5.0 mm) is a broader view of the same area.

The next pair of photos (FOV 2.3 x 3.1 mm) shows an aggregate of rosettes spanning 2.2 mm. Note the very small gobbinsite aggregate in the upper left. The two minerals were often associated.

The next two pairs of photos (FOV 6.4 x 4.25 and 4.1 x 6.3 mm resp.) show numerous rosettes from another area on the specimen. The individual discs are a bit < 1 mm in diameter.

There isn’t much contrast between the chabzaite, albite, and analcime, so I have a provided arrows to point out a few of the rosettes.

This is not a delicate specimen. Single item shipping weight (no case) is 4.2 oz (120 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).