The Growth of High Quality Quartz in Commercial Autoclaves

Hydrothermal growth runs were performed i n b o t h commerc ia l and research au toc laves in an e f for t to ach ieve h ighe r pu r i ty a lpha qua r t z w i th a minimum of d is loca t ions . These runs employed both sodium hydroxide and sodium carbonate as mine ra l i ze r s . It w a s found tha t the impur i ty concent ra t ion of aluminum can be rout ine ly reduced to be low 0.5 p a r t s p e r m i l l i o n wi thou t t he use of a l i n e r . The a v e r a g e d i s l o c a t i o n count can be reduced by a t least an o rde r o f magnit ude wi th the use o f spec ia l s eeds .