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

Mica
Silicate biotite
hydrous potassium magnesium iron aluminosilicate
K (Mg Fe)3 Al Si3 O10 (OH F)2
Scale bar = 1 centimetre
cleavage: Perfect basal
crystal system: Monoclinic
hardness:  2.0 - 3.0
relative density:  2.7 - 3.3
Trelavock Down
25 L 4