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How to test Specific Gravity / stone density - identifying natural whetstones. S.G. testing jade
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- čas přidán 19. 08. 2024
- Here is a short video on how to test the density of a sharpening stone or rough stone material.
This process is how we identify Jade vs other stones that look similar but can be proven to be not dense enough to fall in the range of jade.
If your Interested in seeing the actual sharpening stones after they are cut from these rocks then check out NaturalWhetstoneSharpening.com
#SharpeningStone #Density #SpecificGravity 
Dude I love your videos, as a sharpening fanatic and natural stone enthusiast these vids are amazingly informative in the ways or stone hunting and lapidary techniques! Keep it up!
This is great, thank you. Just one thing I noticed, that first piece you spoke about, quartzite. It looks very much like one of the serpentine minerals, and the SG matches beautifully. If it was found near the Nephrite, that’s almost certainly what it could be. Very hard to tell without seeing it in real life, but just a thought…..
Hey Phil thanks for your comment! The hardness of the yellow honey colored stone is a 7 which is harder than serpentine will be so that’s how I ruled it out. Also 2.65 ish range specific gravity is spot on for quartzite minerals
A 3 is a pretty high specific gravity. I have several Arkansas stones and the densest is about 2.68gms/cc3 and that is a “surgical” black.
Yes jade is a lot denser than Arkansas stones and WAY stronger. Arks are fragile vs impact jade is robust.
Do it have to minus (Substract) : I think the weight of the stone without water÷inside water
Great video. Thanks
A 3.0 is pretty dense, mt densist Arkansas is about 2.68 gems/ cc3
Yes this is an excellent whetstone comparison. And Arkansas stones are VERY fragile against impact where jade is extremely resistant.
Jasper also can be a 2.68 SG in that line of whetstones I craft as well. NaturalWhetstoneSharpening.com
Is it the same thing if I do the weighing by placing the scale underneath the buckle of water with said stone suspended in the water? (ok, let the reading of scale this time be X) Therefore, the specific gravity would be calculated as the weight of the stone suspended in AIR divided by X. There are a few YT vids doing it like that. I was confused at first. But after a little bit of "thinking" in Science, I am quite sure they are just two sides of the same coin. 😁
This one example of such vids czcams.com/video/I4HcIs3V4ic/video.html
Btw, most of the Science I found online explain it like the way you did it, with the substraction. I guess that is the fundamentals. The other method I bring up here, could just be the "simplified" version.
What ASTM?
I’m not sure I know what ASTM stands for - can you clarify for me what you are asking?