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

Beryl
Silicate aquamarine
beryllium aluminosilicate
Be3 Al2 [Si6 O18]
Scale bar = 1 centimetre
cleavage: Indistinct
crystal system: Hexagonal
hardness:  7.0 - 8.0
relative density:  2.6 - 2.9
Mourne Mountains, Co. down, Ireland
24 L 8