Excerpt from The Principles of Chemistry, Vol. 4 Of some eerpentioes. The commonest ore, and the chief source of the chromium compounds, is the chrome iron are or chromite, which occurs in the Umls' and Asia Minor, California. Australia, and other localities. This is magnetic iron ore, in which the ferric oxide is rel by chronic oxide, its composition being Chrome inon ore crystallisee in octahedra of six gr. 41 it has a feeble metallic lustre, is of a gmyieh-hlack colour, and gives a brown powder. It is very ieehly acted on by acids, but when fund with potassium acid mlphete it gim a soluble mm, which contains a chromic salt, besides potnninm sulphate and terms sulphate. In practice the treatment of chrome iron ore is mainly carried on for the preparation of chromite; and not of chromic alts, and therefore we will trace the history of the element by beginning with chromic acid, and especially with the working up of the chrome iron ore into potanimn diamante, u the most common salt of this acid. It must be merited that ohmic anhydride, Cr0, is only obtained in an anhydrous state, and is distinguished for its capacity (or easily giving mhydwultt with the elhalis, containing one, two, and even three equivalent. Oi the anhydridetooneeqninlentoihm Thmamong the potassium salts there is known the normal or yellow chromite, k, cr0'. Which corre sponds to, and is perfectly isomorphons with, potassium sulphate. Wily forms isomorphons mixtures with it, end is not thereto suitable for a pmminwhichitisneoesmrytoeepentethenltfromnmixture eontainingsnl'pham. Asia the presence of a eertaincxoessofacid, thediohmmate, k, cr,0, 2k, cro' 211k qkx in easily foamed from k, cr0', the object of the menuiteturer ia'to produce mchodichromte. Themoreooaeitoomtaimehrgerpmportionofthe elements of chronic acid than the normal nit. Finely-ground chrome. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.