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

Amphibole
Silicate hornblende
hydrous calcium sodium magnesium iron aluminosilicate
(Ca Na)2 (Mg Fe Al)5 (Si Al)8 O22 (OH)2
Scale bar = 1 centimetre
cleavage: Prismatic good
crystal system: Monoclinic
hardness:  5.0 - 6.0
relative density:  3.0 - 3.5
St Sampson, St Peters Port, Guernsey
25 L 1