THE CRYSTAL CHEMISTRY OF THE AMPHIBOLES 337

composition (including Fe8" and HaO) withchanging envir,onment provides much moreinformation. Such investigations have alreadybegun (Ungaretti et al. l98l) and promise toexpand in the fufure, coupled with correspond-ing work on coexisting minerals. Thee studieswill be expensive and will require a changein the general perception of the relationshipsbetween crystallography, mineralogy and petrol-ogy; the result will be a better characterizationof petrologic processes.

ACKNOWLEDCEMENTS

The author thanks Roger G. Burns, MaryellenCameron and David R. Veblen for theirthorough reviews of this manuscript. This workhas been done over the last 5 years with theencouragement of Dr. R. B. Ferguson. Financialassistance was provided by the National Re-search Council of Canada (grants to R. B.Ferguson and F. C. Hawthorne; researchfellowship to F. C. Hawthorne).

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