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 48
Fig. 38. Fig. 39. yet properly the former is atetartohedral, the latter a hem-ihedral species. In holohedric species the predominantfaces are usually those of the two hexagonal prisms coPand 00 P2, or of the pinacoid OP; while the pyramids Pand 2P2 are the most common subordinate forms. Figure38…
Precious stones · Building stones · Mineralogy
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