The petrofabric analysis by means of X-ray was first suggested by Professor B. Sander, and a Debye-Scherrer photograph of a slate was taken to show the inhomogenity of the rock fabrics. However the method of analysis and interpretation was not extensively developed. Rocks of cryptocrystalline texture or composed of fibrous or micaceous minerals, which may at times be the best basis The petrofabric analysis by means of X-ray was first suggested by Professor B. Sander, and a Debye-Scherrer photograph of a slate was taken to show the inhomogenity of the rock fabrics. However the method of analysis and interpretation was not extensively developed. Rocks of cryptocrystalline texture or composed of fibrous or micaceous minerals, which may at times be the best basis