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

Plumbocalcite
Carbonate rhombohedral crystals
calcium carbonate with lead
Ca CO3 + Pb ??
Scale bar = 1 centimetre
cleavage:
crystal system:
hardness: 
relative density: 
Leadhills, Lanarkshire
24 B 2