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of oxygen with two atoms (or radicals) of some other substance; thus, alumina, Al2O3 is a sesquioxide.

Er. Atomic weight 165.9. Its salts are rose-colored and give characteristic spectra. Its sesquioxide is called erbia.

forms definite salts, analogous to the chromates and sulphates. -- Ferric oxide (Chem.), sesquioxide of iron, Fe2O3; hematite. See Hematite.

An important ore of iron, the sesquioxide, so called because of the red color of the powder. It occurs in splendent rhombohedral crystals, and in massive and earthy forms; -- the last called red ocher. Called also specular iron, oligist iron, rhombohedral iron ore, and bloodstone. See Brown hematite, under Brown.…

eolus (P. vulgaris). See under Bean. -- Kidney ore (Min.), a variety of hematite or iron sesquioxide, occurring in compact kidney-shaped masses. -- Kidney stone. (Min.) See Nephrite, and Jade. -- Kidney vetch (Bot.), a leguminous herb of Europe and Asia (Anthyllis vulneraria), with cloverlike heads of red or yellow…

Iron sesquioxide in isometric form, probably a pseudomorph after magnetite.

A species of red earth colored by iron sesquioxide; red ocher.

edative salt (Old Med. Chem.), boric acid. -- Sesqui salt (Chem.), a salt derived from a sesquioxide base or analogous compound. -- Spirit of salt. (Chem.) See under Spirit. -- Sulpho salt (Chem.), a salt analogous to an oxy salt, but containing sulphur in place of oxygen.

Native alumina or aluminium sesquioxide, Al2O3; corundum; esp., the blue transparent variety of corundum, highly prized as a gem. of rubies, sapphires, and of pearlés white. Chaucer.

two of some other element or radical; as, sesquibromide, sesquicarbonate, sesquichloride, sesquioxide.

A salt derived from a sesquioxide base, or made up on the proportions of a sesqui compound.

A sulphide, analogous to a sesquioxide, containing three atoms of sulphur to two of the other ingredient; -- formerly called also sesquisulphuret; as, orpiment, As2S3 is arsenic sesquisulphide.

cies of earth used in painting, having a dark reddish brown color, due to the presence of sesquioxide of iron. -- Spanish buckeye (Bot.), a small tree (Ungnadia speciosa) of Texas, New Mexico, etc., related to the buckeye, but having pinnate leaves and a three-seeded fruit. -- Spanish burton (Naut.), a purchase compo…