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Webster 1913 Edition

Noun.

[Named after W.

Hisinger

, a Swedish mineralogist.]

(Min.)

A soft black, iron ore, nearly earthy, a hydrous silicate of iron.

Noun.

A mineral found in the cavities of calcarious spar, in Sudermanland.

hisingerite ‎(countable and uncountable, plural hisingerites)

(mineralogy) An iron silicate with a dark-brown or black color, formula Fe³⁺₂Si₂O₅(OH)₄·2H₂O.