"Pyritical" is a word in ENGLISH

A variety of pseudomorph which has undergone partial or complete change or substitution of material; -- thus limonite is frequently …

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

An earth abounding in pyrites, used by the ancients to kill insects, etc., on vines; -- applied by Brongniart to …

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.

A thin bed of coal mixed with pyrites or carbonate of lime.

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.

Decomposed rock, usually reddish or ferruginous (owing to oxidized pyrites), forming the upper part of a metallic vein.

A supposed new metallic element. It is said to have been discovered in pyrites, and some other minerals, and to …

Powdered copper pyrites used in the amalgamation of ores of silver, as at the Spanish mines of Mexico and South …

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

margába - (Sp. marga, margajita) Pyrites, mispickel; marl.

A sulphide of nickel, commonly occurring in delicate capillary crystals, also in incrustations of a bronze yellow; -- sometimes called …

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; -- …

Of or pertaining to pyrites. See Pyritic.