A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . HI—( < CO O fi A 52: o. < U w HO Q OhW N C P3 DEVELOPMENT OF MINERALOGY 243 Konigsberger thought he detected in smoky quartz small amountsof Coo and HoO, but these and all other determinations seemed tobe brought into question. The effect of the Rontgen, Cathode, andRadium rays was studied and an actual change in color showed that upon heating to a glow decolorized amethystresumed its color when subjected to the
A popular guide to minerals : with chapters on the Bement Collection of minerals in the American Museum of Natural History, and the development of mineralogy . HI—( < CO O fi A 52: o. < U w HO Q OhW N C P3 DEVELOPMENT OF MINERALOGY 243 Konigsberger thought he detected in smoky quartz small amountsof Coo and HoO, but these and all other determinations seemed tobe brought into question. The effect of the Rontgen, Cathode, andRadium rays was studied and an actual change in color showed that upon heating to a glow decolorized amethystresumed its color when subjected to the bombardment of radiumrays. Simon took up the question but his results seem general conclusions were that the change in color producedby heating does not depend upon the gas in which the mineralis heated; that the temperature necessary to remove the color is pro-portioned to the size of the crystal, or of the fragment experimentedwith; that traces of volatile inclusions seemed present, but no con-vincing proof established that the color was due to them. Furthermore at high temperatures decolorized minerals whenexposed to radhun resume their color, and it is simil
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmineral, bookyear1912
