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

Copper
Native element native element
native copper
Cu
Scale bar = 1 centimetre
cleavage: None
crystal system: Cubic
hardness:  2.5 - 3.0
relative density:  8.9
Cornwall, England
25 A 3