Appearance of basal face in natural quartz crystals

Abstract

Unusual appearance of rough basal face on natural quartz crystals is analyzed to represent the form of transitional stage during overgrowth on fractured and partially dissolved rounded surface of earlier formed quartz crystals. The conclusion was obtained through the observations of heterogeneity revealed by cathodoluminescence in amethyst from Four Peaks(Arizona) and bipyramidal quartz from China.