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

Psilomelane
Hydroxide manganese ore
hydrous barium manganese oxide
Ba2 OH Mn5 O10 ?
Scale bar = 1 centimetre
cleavage:
crystal system: Monoclinic
hardness:  5.0 - 7.0
relative density:  3.3 - 4.7
Lostwithiel, Cornwall
25 E 6