Galena is moderately common at MSH as embedded masses. Crystals are much less common and are generally (but not always) microscopic.

On this specimen, the galena grew freely in a cavity with aegirine, which penetrates the galena. There are a several small cubes, to perhaps 1 ½ mm, and areas of stepped growth (First photo – FOV 4.5 x 3.5 mm), altogether spanning more than 1 cm. The faces are more or less iridescent. Some of the galena has altered to pale geen/blue blobs. Possibly this is cerussite (which is very rare at MSH), but it might just be calcite. (I haven’t tried the obvious “acid test”.) This stuff can bee seen in the second and fourth photos.

There are a few small dings, but most of the crystals are intact or have “natural” flaws due to alteration or pre-mining events. For example, the crystal at lower right in the second photo (FOV 4.6 x 6.9 mm), which looks like it might be damaged, actually has some brownish platy crystals (perhaps catapleiite) growing on it.

These platy crystals are seen again at lower left in the third photo (FOV 4.7 x 6.9 mm).

The fourth photo (FOV 5.0 x 3.9 mm) shows the most altered galena. The off-white crusts may – or may not – be cerussite.

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