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A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .. (1859)

Feuchtwanger, Lewis. [from old catalog] · New York, D. Appleton & company · leaf 50

An illustration from A popular treatise on gems, in reference to their scientific value; a guide for the teacher of natural sciences, the jeweller, and amateur: together with a description of the elements of mineralogy, and all ornamental and architectural materials .., 1859, leaf 50
Fig. 41. and then planes drawn from the extremities of this enlargedaxis to the lateral edges of the rhombohedron, as in figure42, the scalenohedron is constructed. Hence it is desig-nated by mR, the n being written on the right hand, likean algebraic exponent: and the dihexagonal prism is inlike…

Precious stones · Building stones · Mineralogy

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