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Webster 1913 Edition

Noun.

[F.

marcassite

; cf. It.

marcassita

, Sp.

marquesita

, Pg.

marquezita

; all fr. Ar.

marqashītha

(Min.)

A sulphide of iron resembling pyrite or common iron pyrites in composition, but differing in form; white iron pyrites.

Golden marcasite

tin.

[Obs.]

Noun.

A name which has been given to all sorts of minerals, to ores, pyrites, and semi-metals. It is now obsolete.