Determination of fluorine in silicate and phosphate rocks,micas and stony meteorites

By making certain modifications to a published procedure for fluorine in rocks, it has been possible to improve stability and extend the range of the method. The modified method has been successfully applied to silicate and phosphate rocks, micas, glass and stony meteorites, containing from 60 p.p.m. to 8% fluorine. Some precautions are recommended for reliable determination of chlorine.