SEM analysis after 6 months showed secondary arsenolite (As2O3) and Ca–Al–Mg sulphates on arsenopyrite-rich ore surfaces, but an absence of secondary minerals, including Sb oxides, on stibnite-rich ore surfaces.
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Samples of arsenopyrite-rich (≈2.5 wt% As) and stibnite-rich (≈10 wt% Sb) ore were collected from the Globe-Progress mine in the Reefton goldfield, New Zealand.
The main source of this element is Stibnite (Sb2S3), an ore which whilst being widely distributed is not very plentiful (hence the abundance of only 0.2 ppm of antimony within the earth's crust).
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Subfossil larval head capsules of the same species were found in Laguna Stibnite at 46°S in Chile dated to about 2,500 years ago and in Puerto Blest, Lago Nahuel Huapi at 41°S in Argentina dated about 2,000 years ago.
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Antimony is found in ores or other minerals, often combined with oxygen to form antimony trioxide or with sulfur to form stibnite.
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MINERALOGY: A naturally occurring arsenic sulfide, is found in veins of lead, silver and gold, associated oropimiente and other minerals of arsenic and stibnite.
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