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Mattheddleite: Pb20(SiO4)7(SO4)4Cl4
Comments: Radial aggregates of colorless hexagonal microcrystals of mattheddleite with minor blue-green caledonite. Location: Dry Smale Gill, Roughton Gill, Caldbeck Fells, Cumbria (Cumberland), England, United Kingdom. Scale: See Image. © Rruff Database