🚀 go-pugleaf

In article <2473@krafla.rhi.hi.is>, adamd@rhi.hi.is (Adam David) writes...
>In <36440@cup.portal.com> metzger@cup.portal.com (David G Metzger) writes:
> 
>>In article <1197@inews.intel.com>, bhoughto@cmdnfs.intel.com
>>   (Blair P. Houghton) writes:

>>>(cleaving).  When there's a uniformity of heat
>>  ^^^^^^^^
> 
>>     Quartz does not have cleavage planes.  When quartz breaks, it
>>is by conchoidal fracture.
> 
>Depends on how it grew doesn't it? Defects in the crystal can form very regular
>fracture planes that behave just like cleavage planes. This weak area is the one
>most likely to break if the deformation occurs nearby. But then again, there
>aren't supposed to be any defects are there?
> 
   "Quartz" halogen light tubes are not Crystals they are amorphous. The
quartz label just refers to the fact that the glass is almost pure SiO2
without the usual salts added to window glass to lower the melting point.


				Chuck@mitlns.mit.edu