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 36
and twelve shorter edges, threeand three over each of its faces. The angles are six tetra-gonal (rhombic), four acute trigonal, and four obtuse tri-gonal angles. The principal axes join two and two oppo-site rhombic angles.—Ex., gray-copper ore. (4.) The hex-akistetrahedrons (fig. 11) are bounded…
Precious stones · Building stones · Mineralogy
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-115-306.webp)
