A photo of a giant $4 million block of quartz crystal has gone viral about two years after it was found in a US mine. The image shows a mine worker posing beside a 2.5-metre chunk of quartz discovered beneath mineral-rich Arkansas, reports the Arkansas Democrat Gazette. It was posted on Reddit and Instagram earlier this week. The Reddit post has more than 57,000 … [Read more...] about Photo of giant quartz block goes viral – two years on