Al2O3 ? Also hexagonal that dishes when broken. Quartz has some amazing properties and the temperature coefficient is related exactly to the crystal cut angle. The ZTC makes a Rolex watch work with body temperature. Time was defined by quartz in the last century and now it is defined by propeties of atomic atoms.
Some interesting and unusual tech. info. there Randy! Not sure if you got that info, off the internet, or you genuinely like and know about crystals. Anyway, thanks and best wishes - Jim
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