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 heulandite
hydrous calcium sodium potassium aluminosilicate
(Ca, Na, K2)4 {Al8 Si28 O72] (H2O)24
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Monoclinic
hardness:  3.5 - 4.0
relative density:  2.1 - 2.2
Kilpatrick, Dumbartonshire
24 E 6