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

Calcite
Carbonate showing cleavage planes
calcium carbonate
Ca CO3
Scale bar = 1 centimetre
cleavage: Perfect
crystal system: Trigonal
hardness:  3.0
relative density:  2.7
Derbyshire
26 I 2