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

Epidote
Silicate pistacite
hydrous calcium iron aluminosilicate
Ca2 (Al Fe)3 (Si O4)3 OH
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness:  6.0 - 7.0
relative density:  3.3 - 3.5
Willow Craig, Keswick, Cumberland
26 F 7