I have a mineral with 72 percent Bi.
It would be helpful to know what the form and color of your bismuth-rich mineral look like.
Please show us a picture.
If it is a silvery-gray metallic lustrous ore mineral, then it could be bismuthinite (bismuth sulfide).
The chemical formula of bismuthinite is Bi2S3 and the bismuth content is ca. 81 % (in weight percent).
Kind regards,
Guenter Grundmann
http://www.webmineral.com/chem/Chem-Bi.shtml#.XgjRahtCepo
In the table on this page you can find bismuth minerals, and in the first column you have the percentage of bismuth in each mineral.
Thanks for your answer. I know about this site but none of them is not related to the percentage of elements.
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