Quaquaversal (Bates, R. L. & Jackson J. A., 1980).
Strata or structure dipping outward in all directions away from the central point.
This term has been also used as a synonym of periclinal. Exemples of this type of structure are: salt dome, salt ridges, etc.
Crystalline silica SiO2. It is after feldspar the most common mineral.
Quartz occurs either in transparent hexagonal crystals (colorless, or colored by impurities) or in crystalline or cryptocrystalline masses.
Quasi-Instantaneous (Termier, H & Termier, G., 1956).
A geological event is considered as quai-instantaneous when it occurs in an interval of geological time too small to be subdivided.
