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

Vivianite
Phosphate blue ochre
hydrous iron phosphate
Fe3 (Po4)2 OH8 ??
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness:  1.5 - 2.0
relative density:  2.7
Wheal Jane, St. Kea, Cornwall
25 I 3