Bulk chemical analyses including some minor constituents are reported for six standard silicate rocks available from the U.S. Geological Survey. In addition to the conventional rock analyses, determinations of a number of constituents have been made by various instrumental methods. Three new standard mineral samples are available from The Pennsylvania State University. These include albite from Amelia County, Virginia; adularia from Val Cristallina, Switzerland; and pyroxene from near Libby, Montana.

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