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Mereheadite - Torr Works Quarry, Cranmore, Mendip, Somerset, England, UK (TL) (#:MINS9101)

Yellow-orange, vitreous Mereheadite within a veinlet of white calcite cutting a beautifully contrasting black matrix. Rare specimen from the type locality.

Formula :
Pb₄₇Cl₂₅(OH)₁₃O₂₄(CO_3)(BO₃)₂
System: monoclinic Hardness:2½-3 Rarity:very rare
Strunz id:III/DC.45 - HALOGENIDES
Name origin: Named after Merehead quarry, Somerset, the source of this and other unusual lead secondary minerals.