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THE BOOK OF DIAMONDS
cially
temperatures, and also by the quality of the diamond examined.
Undoubtedly the chemical impurities and the foreign inclusions
contained in the diamond affect the specific gravity.
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The
above table shows that if this whole mixture of minerals was thrown
into methylene iodide, the hornblende and all above that mineral would
rise to the surface, while the diamond and all minerals below would
sink to the bottom. If the heavy minerals were thrown into thalium
lead acetate, they would all sink to the bottom, except the diamond
which floats, and could be skimmed off.
The
diamond is considered a non-conductor of electricity, but it will
become positively electrified. It retains the charge for a very short
time only; never more than half an hour. The coefficient of expansion
increases very rapidly above 7500, and diminishes very rapidly at low temperatures, the maximum density is attained about — 42°C. The
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