Calcite on Barite

A pair of interpenetrate squat prismatic crystals resting on a barite matrix with some sprinkles of small pyrites coated with a pyrite druise. I purchased it in 2001, as it was an obscure locality and I liked the composition. I have been unable to find any reference to “Mine 66” since purchasing it. Thus, I leave it to the buyer to figure this one out.

Locality: Mine 66 (?) , Saxony, Germany

Composition: calcium carbonate