A System of Mineralogy: Including an Extended Treatise on Crystallography: with an Appendix, Containing the Application of Mathematics to Crystallographic Investigation, and a Mineralogical Bibliography

Durrie & Peck and Herrick & Noyes, 1837 - 571 pages

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Page 57 - ... is the weight of a volume of water equal to that of the mineral.
Page 53 - It will be remembered that, according to these laws, light, in passing from a rarer to a denser medium is refracted towards the perpendicular; and, on the contrary, that in passing from a denser to a rarer medium, it is refracted further from the perpendicular.
Page 53 - Rubicon on a certain occasion, and it is a contingent general truth that the sine of the angle of incidence bears a constant ratio to the sine...
Page 57 - The specific gravity of a mineral is its weight compared with that of another substance of equal volume, whose gravity is taken at unity.
Page 28 - Let a mass of matter be supposed to consist of spherical particles all of the same size, but of two different kinds in equal numbers, represented by black and white balls; and let it be required that, in their perfect intermixture, every black ball shall be equally distant from all surrounding white balls, and that all adjacent balls of the same denomination shall also be equidistant from each other.
Page 60 - If the file abrades the mineral under trial with the same ease as No. 4, and produces an equal...
Page 304 - ... that the diamond originates like amber from the consolidation of, perhaps, vegetable matter, which gradually acquires a crystalline form by the influence of time, and the slow action of corpuscular forces.
Page 73 - CARPENTER, GEORGE W. On the Mineralogy of Chester County, with an account of some of the Minerals of Delaware, Maryland and other Localities.
Page 366 - F., and is composed of 5 parts of bismuth, 2 of lead, and 3 of tin. IV.— Wood's Metal.— Tin 2 parts Lead 4 parts Bismuth 5 to 8 parts This silvery...
Page 67 - The Use of the Blow-pipe in Chemical Analysis, and in the Examination of Minerals ; by JJ BERZELIUS, Member of the Academy of Sciences of Stockholm, S;c.

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