White arsenic glass

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Unlike the octahedral form, vitreous white arsenic on heating melts before volatilisation begins.8 The density of the glass has been variously given 9 as 3-70 to 3-88 Winkler found the density under water to be 3-7165 at 12-5° C. but under petroleum 4-6815. The glass is brittle and its hardness is comparable with that of Iceland spar.10... 

It must be borne in mind when reviewing the theories of the alchemists, that there were a number of phenomena known at the time, the superficial examination of which would naturally engender a belief that the transmutation of the metals was a common occurrence. For example, the deposition of copper on iron when immersed in a solution of a copper salt e.g., blue vitriol) was naturally concluded to be a transmutation of iron into copper, although, had the alchemists examined the residual liquid, they would have found that the two metals had merely exchanged places and the fact that white and yellow alloys of copper with arsenic and other substances could be produced, pointed to the possibility of transmuting copper into silver and gold. It was also known that if water (and this is tme of distilled water which does not contain solid matter in solution) was boiled for some time in a glass flask, some solid, earthy matter was produced and if water could be transmuted into earth, surely one metal could be... 

The phosphides, arsenides, and antimonides of the other metals are usually dark-coloured substances, with more or less metallic lustre, and therefore conductors of electricity. Some of them occur native for example, smaltine, CoAs2, a common ore of cobalt, forming silver-white crystals copper-nickel, NiAs, red lustrous crystals, and one of the chief nickel ores speiss, a deposit formed in the pots in which smaltine and copper-nickel are fused with potassium carbonate and silica, in the preparation of smalt, a blue glass containing cobalt its formula appears to be Ni8As2. Mispickel, or arsenical pyrites, is a white lustrous substance, of the formula FeSAs. 

Take thy Mercury prepared with its arsenic of seven, eight, nine, or ten Eagles put it into a phial, and thou shalt lute it with the Lutum Sapientiae. Place it in a furnace of sand, and let it stand in a heat of sublimation, so that it may ascend and descend in the glass, until it be coagulated a little thicker than butter. Continue it unto a perfect coagulation, until it be as white as silver. 

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