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

Topaz
Silicate in granite
hydrous aluminosilicate
Al2 Si O4 (OH F)2
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Orthorhombic
hardness:  8.0
relative density:  3.5 - 3.6
Mourne Mountains, Co. down, Ireland
24 L 7