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

Tetrahedrite
Sulphide coated with chalcopyrite
copper antimony sulphide
Cu12 Sb4 S13
Scale bar = 1 centimetre
cleavage: None
crystal system: Cubic
hardness:  3.0 - 4.5
relative density:  4.6 - 5.1
Liskeard
25 C 5