"Marcasite" is a word in ENGLISH

A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, …

A mineral of a tin-white color and metallic luster, containing arsenic, sulphur, and iron; -- also called arsenical pyrites and …

A sulphide having two atoms of sulphur in the molecule; a disulphide, as in iron pyrites, FeS2; -- less frequently …

Lumps of pyrites or sulphuret of iron, the color of which is near to that of brass.

Copper pyrites, or yellow copper ore; a common ore of copper, containing copper, iron, and sulphur. It occurs massive and …

Green vitriol, or sulphate of iron; a green crystalline substance, of an astringent taste, used in making ink, in dyeing …

Iron pyrites, formerly used for striking fire; also, a flint.

Arsenical iron pyrites; arsenopyrite.

Iron pyrites, or arsenical pyrites; -- so called by the Cornish miners.

A sulphide containing more sulphur than some other compound of the same elements; as, iron pyrites is a persulphide; -- …

A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron …

A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white …

A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the …

A mineral of a steel-gray or iron-black color; tin pyrites. It is a sulphide of tin, copper, and iron.