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 gilbertite
silicate
Scale bar = 1 centimetre
cleavage: Perfect basal
crystal system: Monoclinic
hardness:  2.5 - 3.0
relative density:  2.8 - 2.9
Stenna Gwynn, Cornwall
25 L 3