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

Langite
Sulphate rippled crust
hydrous copper sulphate
Cu4 SO4 OH8 ?
Scale bar = 1 centimetre
cleavage:
crystal system: Monoclinic
hardness:  2.5 - 3.0
relative density:  3.2 - 3.3
Cornwall
25 H 1