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

Garnet
Silicate andradite
calcium iron titanium silicate
Ca3 (Fe Ti)2 Si3 O12
Scale bar = 1 centimetre
cleavage: None
crystal system: Cubic
hardness:  6.0 - 7.5
relative density:  3.4 - 4.3
Belston Consols Mine, Sticklepath, Devon
25 K 1