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<p>[QUOTE=&quot;TDRismyname, post: 992892, member: 26939&quot;]And yes, true quartz crystal was used prior to the 19th century, but since then glass with a greater than 20 or so % lead is reffered to as crystal, the higher the % lead the better. It is remarkable that a heavy metal can be made soluble in glass. </p><p><br /></p><p>To make a Quartzite glass would be nearly impossible, it would have to be cut with facets like a gem, I believe qartzite grows in a hexagonal structure so making a round surface is almost impossible, unlesss you just grind it away and polish it, in which case you would need a HUGE, flawless, specimen to make 1 glass, let alone a goblet or bowl. Finding such a crystal would be akin to finding a 5ct rough diamond of gem quality. Quartzite is also the mineral most associated with gold, when you find large amounts of quartz in a rock it will usually contain gold... another funny fact is &quot;fools gold&quot; is actually a prelude to finding the real deal, it&#039;s also one of the minerals usually found in large placer deposits.[/QUOTE]</p><p><br /></p>

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