Mereheadite

Mereheadite is a rare lead oxychloride incorporating barium and this specimen is from its type locality at Torr Works quarry (often referred to as Merehead quarry) at Cranmore in Somerset, England.  Two yellowish-orange patches, one roughly 1 x 1 cm, the other 0.8 x 0.8 cm, display well in an almost pure white matrix of what is likely mixed Calcite and Mendipite.