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

Limonite
Hydroxide wood iron ore
hydrous iron oxide
Fe O OH
Scale bar = 1 centimetre
cleavage: None
crystal system: none
hardness:  5.0 - 5.5
relative density:  2.7 - 4.3
Restormel iron mine, Cornwall
25 E 2