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Have Rock With A Specific Gravity Of 3.45311

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If the density is correct then my guess would be impure barite. If you have access to a really hot flame, like a brazing torch, stick a corner of your rock into it. If you get a pale green flame it's barite. If your density is high then maybe magnesite (3-3.2). 

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FlAme check no green I did my math wrong and forgot to times my volume by pie before I could calculate the grAvity and it turned out to be a faint imprint fossil of a ammonite snail. Sorry for my mistake .


But look at the photos on my new post please 

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