On the radial section, the pores ran the length of the trunk, with wood grains perpendicular to the pores. XRD showed that the quartz peaks had an average 2Θ of 21.0, 26.7, 36.6, 39.6, 40.4, 42.5, ...

Preferred orientation of the mica particles leads to serious interference with the most sensitive quartz x ray diffraction peak which, if not recognised, will result in an overestimation of the quartz ...