This is not the biggest or best specimen of “leifite” from MSH. But the crystals (about 3-4 mm) are very attractive under a scope.

FOV in the first photo is 6.7 x 4.2 mm. These same crystals are shown from a slightly different angle in the next pair of photos. The fourth photo (FOV 4.6 x 3.8 mm) shows some of the terminations.

These crystals are also visible at the top of the first macro photo. In the center of that photo is kupletskite spanning about 1.2 x 1.0 cm. The kupletskite has a beautiful “burnished chestnut” color, but it is embedded in the matrix and only the top can be seen. Some of the crystals are damaged and/or encrusted, but as shown in the next photo (FOV 7.0 x 4.5 mm), a close-up of the best part, there are several beautifully striated crystals. I’m not sure I understand the morphology, but the striated parts appear to be the “sides” of the crystals.

The last photo shows the back of the specimen where two or three additional embedded sprays of leifite are visible at center right.

Note: Both leifite and eirikite are found at MSH. According to Horváth, analyzed specimens are about equal in number and many, if not most, specimens are very border-line in composition. Simple EDS was inconclusive on the specimens I sent for analysis. Therefore “leifite group” is the only safe label (although labeling specimens as ‘leifite, eirikite”, is probably accurate in most cases).

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