Introduction: barytocalcite typically occurs in low-temperature 'Mississippi Valley Type' hydrothermal veins. It tends to be associated with other barium minerals and with base-metal sulphides, particularly galena and sphalerite.

Occurrence in Wales: barytocalcite was first recorded in Wales from Glamorgan (North, 1916), with reference to a specimen presented by Col. Rimington to the British Museum in 1886. Although the exact locality was not recorded, a description by Dr. G. T. Prior led North to suggest that the specimen was probably derived from one of the iron mines at Mwyndy. This occurrence was supported by a donation, in 1925, of a specimen of barytocalcite from Llantrisant, to the National Museum of Wales by the Cymmer Colliery Workmans Library. No other discoveries were made until the mid-1990s when small pseudomorphs after barytocalcite were found at Dolyhir Quarry, near Old Radnor in Powys. Subsequent fieldwork confirmed the presence of primary barytocalcite in significant quantity (for a rare mineral) at this site.

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