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

Fluorite
Halide twinned crystals
calcium fluoride
Ca F2
Scale bar = 1 centimetre
cleavage: Perfect octahedral
crystal system: Cubic
hardness:  4.0
relative density:  3.2
Alston moor, Cumberland
26 B 5