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

Gypsum
Sulphate alabaster
hydrous calcium sulphate
Ca SO4 OH?
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness:  2.0
relative density:  2.3
Becon Hill, Newark, Nottinghamshire
26 J 4