The most common method of analyzing crystalline
silica is based on the diffraction of X-rays off the repeating layers of atoms in the
crystalline structure. XRD is the most general but most expensive method. Because
alternate analytical peaks are available, XRD is the method used by OSHA at the Salt Lake
Technical Center (compliance) and at the Wisconsin State Lab (consultation). It is also
used by MSHA for Metal and Non-metal Mining samples.
Analytical methods developed by recognized authorities provide a basis for individual laboratory procedures. A summary of and access to recognized sampling and
analytical methods is provided.