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Quartz in Amakusa pottery stones was characterized by various methods. Two specimens were collected from Tsurugasako-ko in Sarayama-vein and Kadonosako in Kaigan-vein among the Amakusa pottery stone deposits. They were crushed and classified into six fractions. Quartz was extracted from the classified pottery stones by chemical treatment using phosphoric acid and fluoric acid. The following anomalies were observed for quartz in the pottery stones. (1) Lattice constants of quartz in Tsurugasako- ko were larger than those in synthetic rock crystal up to o. 0029 A in a-axis and 0.0051 A^^゜ in c-axis, and those in Kadonosako were up to 0.0038 A^^゜ in a-axis and 0.0026 A^^゜ in c-axis. (2) Lattice strains were 2-17X10^<-4> in Tsurugasako-ko and 7-24 X 10^<-4> in Kadonosako, and increased with decreasing grain size. (3) The temperature of the en-dothermic peak due to a -β phase inversion was a little lower than 573℃, the inversion temperature of normal quartz. The peak was broader than that for normal quartz, and asymmetric in large grains. Double peaks were observed in small-grained specimens. (4) The content of Al_2O_3 analyzed was from 0.5 to 0.9 wt% and increased with decreasing grain size. These anomalies can be understood assuming substitution of Al ions into quartz. The transition temperature from quartz to cristobalite in pottery stones was lower than that in synthetic rock crystal, and was dependent on the localities.
社団法人日本セラミックス協会の論文
1989-08-01

天草陶石中の石英について

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