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Webster 1913 Edition

Noun.

[Named after the chemist

Ludwig

(Min.)

A borate of iron and magnesia, occurring in fibrous masses of a blackish green color.

ludwigite ‎(countable and uncountable, plural ludwigites)

(mineralogy) An orthorhombic-dipyramidal mineral containing boron, iron, magnesium, and oxygen.

ludwigite Barthelmy, David (accessed 29 August 2016) Webmineral Mineralogy Database