著者

西居 俊基 小林 祥一 武智 泰史 猶原 順 草地 功 ニシイ トシキ コバヤシ ショウイチ タケチ ヤスシ ナオハラ ジュン クサチ イサオ Toshiki Nishii Shoichi Kobayashi Yasushi Takechi Jun Naohara Isao Kusachi

雑誌

フロンティア理工学研究所研究報告 = The bulletin of Research Institute of Frontier Science and Technology

巻号頁・発行日

vol.1, pp.65-69, 2019-12

著者

Shoichi KOBAYASHI Hiroshi MIYAKE Tetsuya SHOJI

出版者

Japan Association of Mineralogical Sciences

雑誌

Mineralogical Journal (ISSN:05442540)

巻号頁・発行日

vol.13, no.6, pp.314-327, 1987 (Released:2007-03-31)

参考文献数

19

被引用文献数

14 16

---

A jadeite rock from Oosa-cho, northern part of Okayama, is associated with serpentinite of the Sangun metamorphic belt. It consists predominantly of jadeite with such accessary minerals as grossular, analcime, prehnite, vesuvianite, natrolite, thomsonite, stronalsite, zircon, deweylite, chlorite and diopside. It is cut by many veinlets composed of one or more of grossular, analcime, vesuvianite, stronalsite, chlorite and zeolite minerals.On the electron microprobe image, some of jadeite crystals show a growth zoning of diopsidic (Jd96Di3Fs1) and pure (approximately Jd100) parts. Some crystals of garnet show chemical zoning. The core is poor in TiO2, FeO and CaO, but rich in Al2O3 as compared with the rim. Zircon occurs sporadically. Under the microscope, a few grains of stronalsite are observed. Its chemical composition is very similar to the ideal formula, Na2SrAl4Si4016. Ba-rich parts are also recognized in a stronalsite crystal.