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

Zeolite
Silicate mesolite antrimolite
hydrous sodium calcium aluminosilicate
Na2 Ca2 [Al6 Si9 O30] (H2O)8
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness:  5.0
relative density:  2.2 - 2.3
Co. Antrim, Ireland
24 M 3