Small, but sharp, pseudomorphs of birnessite and ranciéite after sérandite on white platy microcline with olive tufts and dark green needles of aegirine.  (Information regarding the presence of both birnessite and ranciéte in these pseudomorphs came from László Horváth.) Most such pseudomorphs are jet black. This is one has a brownish tinge. Perhaps the sérandite is not completely altered.

The largest “crystal” (shown in the first two photos) is about 1.8 mm tall. Overall, the pseudomorphs span about 3.2 mm (third photo). In the full-view photo, the white plates are microcline and the dark needles are aegirine.

Pseudomorphs such as this usually occur in weathered cavities near the top of the sill. Consequently, there is a lot of “mineralogical grunge” in the cavity. Found 4/98.

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