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

¹ Jiyugaoka 821-30, Tsukuba, Ibaraki 300-1266, Japan
² Tohoku University Museum, Aobayama, Aoba, Sendai 980-8578, Japan
³ National Institute of Advanced Industrial Science and Technology, Institute for Human Science and Biomedical Engineering, Tsukuba Central 6, Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan
⁴ Toyo University, Sensor Photonics Research Center, Kujirai 2100, Kawagoe, Saitama 350-8585, Japan
⁵ Kashiwa-cho 3-54-2, Tachikawa, Tokyo 190-0004, Japan

^* Corresponding author, e-mail: quartzcrystal{at}mail.goo.ne.jp

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.

Key-words: crystal morphology, rough (0001) face, natural amethyst, growth history, dissolution.