Petroleum in quartzUnusual inclusions these, and they have the added bonus of making the usually ine
Petroleum in quartzUnusual inclusions these, and they have the added bonus of making the usually inert quartz glow in UV light since crude oil fluoresces (for an explanation of this phenomenon see http://tinyurl.com/kebod3b). They form when hot hydrothermal fluids rich in silica flow in oil containing rocks and precipitate there in pores and gaps, forming crystals such as this Herkimer diamond type pair with petroleum trapped in the cavities within the crystal. This specimen comes from Pakistan, and measures 3.6 cm across. LozImage credit: http://betweenarockandaheartyplace.blogspot.com/2012/02/quartz-with-petroleum-inclusions.html -- source link
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