Vivianite

Vivianite

(Fe2+Fe2+
2(PO
4)
2·8H
2O) is a hydrated iron phosphate mineral  Wikipedia

Wikipedia says about this mineral, "It was named by Abraham Gottlob Werner in 1817, the year of his death, after John Henry Vivian (1785–1855), a Welsh-Cornish politician, mine owner and mineralogist living in Truro, Cornwall, England. John Vivian discovered the mineral at Wheal Kind, in St Agnes, Cornwall.^[2]"

This sample is from Mullica, New Jersey, USA.  The image has a FOV of 11.25mm and is 

2.09X on the sensor.

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