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

Cassiterite
Oxide tin ore
tin oxide
Sn O2
Scale bar = 1 centimetre
cleavage: Poor
crystal system: Tetragonal
hardness:  6.0 - 7.0
relative density:  7.0
Cornwall
25 D 6