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The density of onyx is 2.65 g/cc or kg/m^3
The density of jade ranges from 2.9 to 3.05 g/cc
With a decent set of letter scales capable of measuring to 0.1 g, and a syringe capable of measuring 0.1 cc one should easily be able to make density measurements a la Archimedes to a sufficient accuracy for any masses of black onyx or jade above ~1.5 g.
In short, weigh your black stuff.
Next get a measured volume of water, put your black stuff in the water and measure the volume of displaced water.
The weight divided by the volume is the density.
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∙ 13y ago
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