Re: [ATM] Quartz blanks

[James P Crombie <jpcrombie@pei.eastlink.ca>]

I found this site with a good definition of the various types of 
materials available for mirrors
http://www.minerals.sk.ca/atm_design/mirror_substrate.html

Mark Holm wrote:

>Mel Bartels wrote:
>  
>
>>>quartz pieces for much less than $1500 USD. Can he used
>>>so-called fused silica, BTW?
>>>      
>>>
>>I thought they were essentially the same - is this correct/wrong?
>>
>>Mel Bartels
>>    
>>
>
>My impression is that atm's use quartz, fused quartz and fused silica
>loosely to mean the same thing.  Quartz is technically hexagonal
>crystalline silicon dioxide.  Fused silica is non crystalline silicon
>dioxide.  The Wikipedia articles are very helpful.
>
>  
>
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