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

Bayldonite
Arsenate on sulphide minerals
hydrous lead chloride arsenate
Pb Cl3? (AsO4)2 OH2 ?
Scale bar = 1 centimetre
cleavage: None
crystal system: Monoclinic
hardness:  4.5
relative density:  5.6 - 5.7
Cornwall
25 J 8