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

Bismuthinite
Sulphide bismuth ore
bismuth sulphide
Bi2 S3
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Orthorhombic
hardness:  2.0
relative density:  6.8
25 C 1