Probertite, Cheverie, Nova Scotia
Here is one that you don't see very often! In these specimens, this relatively rare calcium sodium borate mineral occurs as silky aggregates of fine crystals in weathered gypsum. The elongated structure of the crystals is very apparent in some specimens while in others they look like rounded silky balls. These delicate aggregates are exposed in joints in the gypsum as seawater dissolves away gypsum in the joints. Have a look!
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Click on any of the following thumbnails to view a larger image of the specimen.