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

Chalcopyrite
Sulphide massive tarnished
copper iron sulphide
Cu Fe S2
Scale bar = 1 centimetre
cleavage: Poor
crystal system: Tetragonal
hardness:  3.5 - 4.0
relative density:  3.5 - 4.0
Levant mine, Cornwall, England
25 B 4