Page "Antimony" Paragraph 12
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Wikipedia
The abundance of antimony in the Earth's crust is estimated at 0. 2 to 0. 5 parts per million, comparable to thallium at 0. 5 parts per million and silver at 0. 07 ppm.
Antimony is sometimes found natively, but more frequently it is found in the sulfide stibnite ( Sb < sub > 2 </ sub > S < sub > 3 </ sub >) which is the predominant ore mineral.
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