Original paper

Appearance of basal faces in natural amethyst crystals from Four Peaks, Arizona

Kawasaki, Masayuki; Nagase, Toshiro; Onuma, Kazuo; Katsumata, Tooru; Sunagawa, Ichiro


The surface microtopography of rough basal faces and internal inhomogeneities of amethyst crystals from Four Peaks, Arizona were investigated by means of optical, scanning electron microscopes and cathodoluminescence tomography. Rough interface overgrowth was shown to have taken place along the c-axis on mechanically broken surfaces and the present rough basal surfaces were demonstrated to have formed because of later heavy dissolution.


crystal morphologyrough (0001) facenatural amethystgrowth historydissolution