<p>Native gold-calaverite-coloradoite from Australia. (CSM 54515, Colorado School of Mines Geology Museum, Golden, Colorado, USA)
</p><p>The highly lustrous rock shown above has 3 metallic-lustered minerals in what appears to be quartz.  The gold-colored minerals are native gold (Au) and calaverite (AuTe2 - gold telluride).  The silver-colored mineral is coloradoite (HgTe - mercury telluride).
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Locality: Kalgoorlie Mining District, Western Australia
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jsjgeology/16584308663/">Native gold-calaverite-coloradoite (Kalgoorlie Mining District, Western Australia)</a>