Catapleiite is moderately common at MSH, genthelvite is “medium-rare”. But genthelvite associated with catapleiite is very unusual. This find of September 1994 is the only one that I know of with this combination. (Of course that’s just my personal experience.) The crystals on this specimen aren’t huge, but they are very attractive under a scope.

FOV in the first pair of photos is ca 1.3 cm. The genthelvite in the upper right hand corner is well formed but it has a rather “weak” greenish color. The dark green sprays are aegirine. The white powdery stuff in the lower left hand corner is dawsonite. Beige natrolite terminations poke up through the dawsonite and elsewhere.

The second pair of photos (FOV 4.5 x 6.2 mm) shows the “back” of the main catapleiite crystal. It measures 5.85 mm tip-to-tip.

The third pair of photos (FOV 6.75 x 4.4 mm) is a close-up of the genthelvite twin perched on the “front” of the main catapleiite crystal. It also shows three smaller catapleiite crystals stacked on top of the main one.

The fourth pair of photos (FOV 4.35 x 6.15 mm) is another close-up of the genthelvite twin showing yet another small attached catapleiite crystal. The genthelvite is 3.0 mm on edge.

The next-to-last photo (FOV 8.8 x 8.6 mm) shows the entire front of the main catapleiite crystal as well as the genthelvite twin.

Single item shipping weight (with TN case) is 3.1 oz (88g). For shipments outside the USA, up to a total weight < 8 oz (225g), this can be combined with other items from this or other auctions for the same postage. If you don’t need the TN case, you can save about 0.3 oz in  weight which could be used for something else.

Within the USA, postage for total weights up to 13 oz ranges from $4.25 to $6.50 (including packing etc) regardless of destination. Above 13 oz, I will use “own box” Priority Mail. The rate, including packing, varies by destination from $7.25 to $9.50.