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<p>[QUOTE=&quot;Chinoiserie, post: 10573724, member: 79460&quot;]My thoughts too but I&#039;m too slow. Possibly various different iron ores and salts including magnetite and pyrite. I can imagine them forming in the same place.</p><p><br /></p><p>Or chalcopyrite mixed in too. Apparently Magnetite, pyrite and chalcopyrite are found together.</p><p><br /></p><p><a href="https://www.irocks.com/minerals/specimen/24736" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.irocks.com/minerals/specimen/24736" rel="nofollow">https://www.irocks.com/minerals/specimen/24736</a>[/QUOTE]</p><p><br /></p>

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