  The paper investigates dry sliding friction of the coarse-grained micronscale
{\alpha}-SiO2 oxide. Adaptive smoothed particle approach is used to consider
various shapes and orientations of the particles. It is found that because of
the stable system the friction characteristics almost do not depend on the
shape and the orientation of the particle. The friction coefficient of 0.1376
observed in the present work is in accordance with that found in previously
experimental reports. The friction coefficient steady maintains in the applied
load range of 5-80 {\mu}N, showing a very slightly linear drop from 0.1379 to
0.1341 in this load range. This observation is also consistent with the applied
load-friction coefficient relationship mentioned in previously experimental
studies.
