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

Siderite
Carbonate tabular crystals
iron carbonate
Fe CO3
Scale bar = 1 centimetre
cleavage: Perfect rhombohedral
crystal system: Trigonal
hardness:  4.0
relative density:  3.9 - 4.0
East Pool mine, Redruth, Cornwall
25 F 4