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

Dolomite
Carbonate on hematite
calcium magnesium carbonate
Ca Mg (CO3)2
Scale bar = 1 centimetre
cleavage: Perfect rhombohedral
crystal system: Trigonal
hardness:  3.5 - 4.0
relative density:  2.8 - 2.9
Gillfoot Mine, Egremont, Cumbria
26 C 8