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On Rocks; Their Chemical and Mineral Composition, and Physical Characteristics
1859
The Geologist
In the definition which I have given, a mineral is described as a body possessed of a definite chemical composition and a regular physical form,—meaning by the latter particularly crystalline structure. But, while the crystalline relations of each species only vary within the narrowest limits, the chemical composition has a much wider latitude. Many individuals of the same mineral species are found, by analysis, to differ most widely in their chemical components, while the crystalline form is
doi:10.1017/s1359465600020852
fatcat:yejab63fgbaytbfw63zadgvltu