Minerals, and How to Study Them: A Book for Beginners in Mineralogy

Edward Salisbury Dana

Franklin Classics Trade Press

Minerals, and How to Study Them: A Book for Beginners in Mineralogy. with More Than 300 Illustrations

<p>Book by James Dwight Dana, Edward Salisbury Dana, Charles Palache, Harry Berman, Clifford Frondel</p>

Dana's System of Mineralogy, Vol. I: Elements, Sulfides, Sulfosalts, Oxides

Science & Math

James Dwight Dana

Charles, Palache

Harry Berman

Clifford Frondel

Earth Sciences

wiley

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1883 Excerpt: ...usually tabular. Twins: twinning-plane O; sometimes producing, when repeated, a form resembling f. 468. Often in thin plates or laminae; massive; in loose grains as sand. H---5--6. Cr.::4'5-5. Iiustre subinetallic. Color iron-black. Streak submetallic, powder black to brownish-red. Opaque. Fracture conclioidal. Influences slightly the magnetic needle. Comp., Var.--(Ti,Fe)-Z03 (or hematite, with part of the iron replaced by titanium), the proportion of Ti to Fe varying. _Mosander assumes the proportion of FeO: TiO2 to be always 1: 1, and that in addition variable amounts of FeO, are present in the different varieties. The extensive investigations of Rammelsberg have led him to write the formula like Mosander (FeO,TiO_,)+nFeO3 (notice here that FeO,TiO2:RO3). This method has the advantage of explaining the presence of the magnesium, occurring sometimes in considerable amount, it replacing the iron (FeO). The first formula given requires the assumption of MgQO3. Friedel and Guerin have recently discussed the same subject (Ann. Ch. Phys., V., viii., 38, 1876). Sometimes contains manganese. The varieties recognized arise mainly from the proportions of iron to titanium. No satisfactory extenial distinctions have yet been made out. The following analyses will illustrate the wide range in composition: Pyr., etc.---B.B. infusible in O.F. although slightly rounded on the edges in R. F. With borax and salt of phosphorus reacts for iron in O.F., and with the latter flux assumes a more or less intense brownish-red color in R.F.; this treated with tin on charcoal changes to a violet-red color when the amount of titanium is not too small. The pulverized mineral, heated with hydrochloric acid, is slowly dissolved to a yellow solution, which, filtered from the undecomposed ...

A Text-Book of Mineralogy; With an Extended Treatise on Crystallography and Physical Mineralogy

History

World

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