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 chabazite
hydrous calcium aluminosilicate
Ca2 [Al4 Si8 O24] (H2O)12
Scale bar = 1 centimetre
cleavage: Indistinct
crystal system: Triclinic
hardness:  4.0 - 5.0
relative density:  2.1 - 2.2
Old Kilpatrick, Dumbartonshire
24 F 1