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

Pyrite
Sulphide cubic crystals
iron sulphide
Fe S2
Scale bar = 1 centimetre
cleavage: Indistinct
crystal system: Cubic
hardness:  6.0 - 6.5
relative density:  5.0
Craddock Moor, Cornwall, England
25 B 8