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 51
Fig. 45. … Fiar. 46. another rhombohedron — JwR ; and in figure 45 its lateraledges bevelled by the scalenohedron mR. A more com- FORM OF MINERALS. 45 plex combination of five forms is represented in the crystalof calc-spar, fig. 46, its sign with the letters on the facesbeing Il*(y) . R{r). R(P) . 4R(m) . oo…
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-106-265.webp)
