Diamonds and precious stones, a popular account of gems .. (1874)
Dieulafait, Louis, b. 1830, Sanford, Fanchon, tr · New York, Scribner, Armstrong, and Company · leaf 170
have mentioned, are formed principally ofsilica: here indeed we would naturally look forthem ; but that which would seem much less pro-bable, and yet actually occurs, is the presence of QUARTZ. 149 magnificent crystals of quartz, of an absolute purity,in the midst of rocks nearly exempt from all…
Precious stones · Diamonds · Gems
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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-113-298.webp)