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 60
Fiff. 63. … Fig. 64. Some combinations of this system, as the series exhibitedby most of the felspars, approach very near to the mono-clinohedric system; while others, as the blue copper, or 54 A POPULAR TREATISE ON GEMS. vitriol, and axinite, show great incompleteness and want ofsymmetry. In the latter case…
Precious stones · Building stones · Mineralogy
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