Extremely rare, (but easily overlooked).
Paragenetic and General Notes
Brucite was first recognised at Tsumeb by Bellendorff (2006) on a specimen from "an old German collection". It occurs as dull-white tabular crystals arranged in rosette-like aggregates, and as earthy crusts (with sepiolite), as part of an unusual paragenesis with the following sequence:
Cerussite (with hydrocerussite) >> wulfenite >> dolomite >> parkinsonite >> calcite (rhombohedral) >> brucite (with sepiolite) >> calcite (scalenohedral).
Notably, parkinsonite (a rare lead-molybdenum oxychloride) was also first identified from Tsumeb from this same specimen.