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

Cuprite
Oxide chalcotrichite
copper oxide
Cu2 O
Scale bar = 1 centimetre
cleavage: Poor octahedral
crystal system: Cubic
hardness:  3.5 - 4.0
relative density:  6.1 - 6.2
Cornwall
25 D 2