Acer palmatum, although there are more than 100 species of maple worldwide, only one species (Acer campestre) is native to the UK.

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Earth lab datasite

Mimetite
Arsenate campylite
lead chloride arsenate
Pb5 (AsO4)3 Cl ?
Scale bar = 1 centimetre
cleavage: None
crystal system: Monoclinic
hardness:  3.5 - 4.0
relative density:  7.0 - 7.3
Dry Gill, Caldbeck Fells, Cumberland
26 E 8