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

Olivenite
Arsenate wood copper
hydrous copper arsenate
Cu2 (AsO4) OH
Scale bar = 1 centimetre
cleavage: Indistinct
crystal system: Orthorhombic
hardness:  3.0
relative density:  4.4
Cornwall
25 I 9