Brauns, R. (Reinhard), 1861-1937, Spencer, Leonard James, 1870- · Esslingen a. N. : J. F. Schreiber · leaf 216
THE PRECIOUS STONES AND RELATED MINERALS. 200 figured 130 years ago by Collini in his Diary of Travels, in which are recorded a variety of mineralogical observations, especially relating to agate and its working. And a figure … milligrams, that is one-fifth of a Fig. 163. gram. Another curious usage in Agate borer. connection with this unit of weight is that the fractions are one-eighth, one-sixteenth, etc. The determination of precious stones and the distinguishing of one kind of stone from another is in certain cases a…
Mineralogy
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