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 70
ig. 71, a similar formation also occurringin the diamond. In macles with inclined axes the twoforms almost always unite by a face of the octahedron, andthe two individuals are then generally apposed and short-ened in the direction of the twin axis by one half, so thatthey appear like a crystal that…
Precious stones · Building stones · Mineralogy
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