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STC SYNTHETIC QUARTZ, 1964
It takes 3 Million years for a Quartz block of this size to grow naturally, this specimen was grown in the STC Harlow Laboratories in 3 weeks.
For its application see Item A1424.
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- The metal clip on the top was part of the seed blank from which the rest of the quartz grew on it. It held the seed in place. You should see the outline of it as there we normally see some surface imperfections that look like small air bubbles.
.......... stephen kimnber , glossop, derbyshire, 7th of February 2011