Hideo Iwasaki and Fumiko Iwasaki
Sobudai-Danchi, 1-6-15-12, Sagamihara 228, Japan
(Received July 28, 1993; Accepted November 9, 1993)
Keywords: Crystal Forms, Quartz, Crystal Growth, Growth Rates, Computer Simulation
Abstract. Crystal forms of bi-pyramidal quartz composed of faces, m, R and r, were drawn by computer simulation under the specific values of growth rate ratios, 1 ² gr(r)/gr(R) ² 2 and 0 < gr(m)/gr(R) ² 2. The simulated forms could be classified into 8-groups, specified by the numerical factor, N, evaluated from the relation, N = (R·r) + m, where R, r and m expressed the number of sides in 3-kinds of faces. Values of N corresponding to 8-groups are specified, respectively, by 0, 3, 5, 9, 13, 21, 27 and 31. The 8-groups are regarded as the whole of possible groups in classification of crystal forms of bi-pyramidal quartz composed of faces, m, R and r. The comparison between drawn and observed crystal forms showed reasonable correspondence.