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Reread post #5, sentences 2 & 3.

Yes I'm sure. The only way it could possibly be higher would be if you had a stone with impurities - which is very rare for an Ark. They are usually on the order of 99.5% pure silica. To properly...

Density is mass/volume. Specific gravity is density of the item under test/density of water. Density of water is near enough 1g/cm³ so for our purposes density and specific gravity are near enough to...