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Gemstones, Minerals & Fossils
Fluorescent Minerals
Interesting stuff under UV
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<blockquote data-quote="user 4386" data-source="post: 593643" data-attributes="member: 4386"><p>Yes, Puttapa was one of our mines with North Ltd. - I think it then went into Pasminco with the split into two companies (so Rio now?). It only has willemite in common with Stirling, and willemite can be primary or secondary. Puttapa seems to be secondary (willemite formed by weathering, perhaps of sulphides like sphalerite - we had that at Tsumeb in Namibia and Berg Aukas). At Stirling the mineral seem to have formed by high grade metamorphism of a zinc orebody, not by weathering, so things like franklinite and zincite are present.</p></blockquote><p></p>
[QUOTE="user 4386, post: 593643, member: 4386"] Yes, Puttapa was one of our mines with North Ltd. - I think it then went into Pasminco with the split into two companies (so Rio now?). It only has willemite in common with Stirling, and willemite can be primary or secondary. Puttapa seems to be secondary (willemite formed by weathering, perhaps of sulphides like sphalerite - we had that at Tsumeb in Namibia and Berg Aukas). At Stirling the mineral seem to have formed by high grade metamorphism of a zinc orebody, not by weathering, so things like franklinite and zincite are present. [/QUOTE]
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Gemstones, Minerals & Fossils
Fluorescent Minerals
Interesting stuff under UV
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