Ethereal sprites of gmelinite-Na to 0.7 mm with a few small aggregates of phillipsite-Na. The phillipsite aggregate near the center of the first close-up photo has a diameter of 0.9 mm. You will need 15X to see these crystals as in the photo.

The second close-up shows a larger (1.1 mm) phillipsite aggregate along with more of the gmelinite. This view requires 30X. Altogether there are about a half dozen such aggregates of phillipsite on the specimen

The phillipsite and gmelinite sit on dolomite sprinkled with nondescript pyrite.

Qualitative EDS is not sufficient for positive ID of zeolites such as gmelinite-Na, but see the “Analysis” tab for a scan that is at least consistent with typical gmelinite-Na. In any case, recent XRD of similar material from the same find says "gmelinite". (All known gmelinite at MSH is –Na, but according to the “Recommended Nomenclature for Zeolite Minerals”, the “Ca content is commonly substantial”. If this were chabazite-Na, we would expect to see K with, perhaps, some Ca.)

Found 7/97 in blast debris from the Poudrette pegmatite – probably the contact zone.

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