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

Axinite
Silicate axe-like crystals
hydrous calcium iron manganese aluminium borosilicate
Ca2 (Fe Mn) Al2 B Si4 O15 OH
Scale bar = 1 centimetre
cleavage: Good
crystal system: Triclinic
hardness:  6.0 - 7.0
relative density:  3.2 - 3.4
Botallack Cliffs, Cornwall
25 K 7