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Celestine spheres in Ebay have a specific gravity of 2.7 (Weight/Volume) instead of 3.9. Are they fake?

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asked Jun 25, 2016 by worried (160 points)

1 Answer

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Celestine is relatively heavy for a transparent mineral. If you are measuring the density correctly, than something is not addning up and there is indeed a liklihood that it is a fake.
answered Jul 24, 2016 by hershel (52,800 points)
With spheres it is easy to calculate density from diameter and weight. I have not found yet a single celestine sphere in Ebay with the correct density of 3.9, mostly are 2.8, the density of calcite. Explanation? I cant believe they are all fake!
2.7 is too light for celestine, so either you are doing a specific gravity test incorrectly, or all the specimens you tested are other material such as dyed calcite. I don't have any other possible explanations to offer.
Hershel, I dont need to make specific gravity tests, I only take the data (diameter and weight) given by the sellers. You divide weight / volume and have specific gravity.