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

Pharmacosiderite
Arsenate cube ore
hydrous iron arsenate
Fe (AsO4)2 OH3 ?
Scale bar = 1 centimetre
cleavage: imperfect to good
crystal system: isometric
hardness:  2.5
relative density:  2.8
Wheal Gorland, Gwennap, Cornwall
25 J 6