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Analysis Summary
 
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To summarize, in the USA, IR and XRD predominate for analysis of quartz with occasional use of the Talvitie based colorimetric procedure. The colorimetric procedure is the most prone to interference, the XRD most resolvable because of the ability to use alternate analytical angles or lines. The XRD method appears the most precise, but also the most expensive Are these observations also seen internationally?
 
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