Yet another please identify my hone-thread

[eKretz]

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 measure density, volume and weight should be measured very closely - digital calipers do nicely - but you need to measure in four places for each dimension and average if the sides aren't parallel. Don't forget that any error in measuring is cubed! This still won't give an accurate measure of volume if the stone is chamfered or if it's porous enough to absorb water. The best way to accurately measure the volume is with a liquid - i.e. water and a burette, but not many have this equipment. Weight to the gram is probably close enough.

I have measured probably 30 hard Arks and never found one over 2.65 S.G.