Abstract
Cristobalite, one of the rarer high-temperature forms of silica, was first described from the andesite of Cerro San Cristobal, near Pachuca, Mexico, by vom Rath,' and was established as a distinct mineral species by Mallard.2 Artificial cristobalite has been prepared in the Geophysical Laboratory at Washington and its properties and its relation to the other forms of silica have been studied by Fenner.3 Silica bricks are made up of artificial cristobalite and tridymite, and so these minerals are of some importance to the
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