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Can some one tell me what this is ?

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Mica shist most likely. If the dust is black then maybe graphite. Shist is most likely if its flaky.
It's flaky but the dust that comes off it isn't black at all def. Not graphite and and it's so shiny it damn near mirrors you when you look at it don't think it's mica
 
You mean weight when you say gravity ?
The ratio of the density of the rock (in water) divided by the density of water. It has more applicability in identification if you are dealing with a single crystal. If you are going to do this with this rock, I would suggest breaking off a small piece to test. Once you are done with the small piece, crush it to a powder, pan it, and see what the heavy concentrates look like.

Other tests include hardness and streak, but most geologists will use a hand lens (7x-10x), look for rock and mineral types and identify the rock based upon the observation. From your description it sounds like the shiny stuff is muscovite mica, but it wouldn't be the first time I have been wrong.
 
It's also very heavy this piece here weighs almost 7 pounds
Where did it come from? Is it magnetic? Scrape off a small piles of "dust" and heat one with a propane torch, put one in HCl, one in bleach. Do it outside minding wind direction, so you don't inhale fumes. Looks like a slug from under a grinder or saw.
 
Where did it come from? Is it magnetic? Scrape off a small piles of "dust" and heat one with a propane torch, put one in HCl, one in bleach. Do it outside minding wind direction, so you don't inhale fumes. Looks like a slug from under a grinder or saw.
Done all these except for the chemical involved ones definitely not from under a gender or saw used to work at a machine shop and it's not that
 
Done all these except for the chemical involved ones definitely not from under a gender or saw used to work at a machine shop and it's not that
Also not sure where it came from exactly friend of mine inherited it about 40 years ago from a local Chinese derilick oddly enough and he never found out what it is so I'm doing what he should have done along time ago ty for y'all's help any other input is appreciated
 
The tests you've run, and their results - please list them.

As to 'mica' - mica is a generic term. There are many minerals that can be called mica. It's kind of like 'salt' - there are many salts. And things that look very different can be the same, and vice versa, depending on how they came into existance - for instance: melted and rate of cooling, evaporated from solution, minor differences in impurities, pressure, and more, and variations in intensity and combinations of all these things.
The tests you've run, and the tests we ask you to run lead to knowing both what something might be and what it is not - eventually getting to an accurate name.
 

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