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Rengeite, Sr4ZrTi4Si4O22, a new mineral, the Sr-Zr analogue of perrierite from the Itoigawa-Ohmi district, Niigata Prefecture, central Japan

Published online by Cambridge University Press:  05 July 2018

H. Miyajima ,
S. Matsubara ,
R. Miyawaki ,
K. Yokoyama  and
K. Hirokawa
H. Miyajima*
Affiliation:
Fossa Magna Museum, Itoigawa, Niigata 941-0056, Japan
S. Matsubara
Affiliation:
Department of Geology, National Science Museum, Tokyo 169-0073, Japan
R. Miyawaki
Affiliation:
Department of Geology, National Science Museum, Tokyo 169-0073, Japan
K. Yokoyama
Affiliation:
Department of Geology, National Science Museum, Tokyo 169-0073, Japan
K. Hirokawa
Affiliation:
Suihodo Co., Ltd, Ohmi, Niigata 949-0301, Japan
*
*E-mail: [email protected]
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Abstract

Rengeite, Sr4ZrTi4Si4O22, is a new member of the perrierite–chevkinite group found in the jades from the Itoigawa-Ohmi district, central Japan. It is monoclinic, P21/a, a = 13.97(1), b = 5.675(7), c = 11.98(1)Å, β = 114.26(8)°, V = 866 Å3 and Z = 2. The six strongest lines in the X-ray powder diffraction pattern are 3.12 (s) (40-3), 3.05 (vvs) (31-3), 2.99 (vs) (311), 2.84 (s) (020), 2.74 (s) (004), 2.20 (s) (31-5). Electron microprobe analysis gave SiO2 22.58, TiO2 29.88, ZrO2 9.49, Nb2O5 0.24, Ta2O5 0.07, Al2O3 0.20, FeO 0.10, CaO 0.43, SrO 34.32, BaO 0.13, La2O3 0.00, Ce2O3 0.38, Pr2O3 0.10, Nd2O3 0.29, Sm2O3 0.04, total 98.25 wt.%, corresponding to (Sr3.62Ca0.08Ce0.03Nd0.02Ba0.01Pr0.01)∑3.76 (Zr0.84Ti0.09Al0.04Fe0.02Nb0.02)∑1.01Ti4.00Si4.11O22 on the basis of O = 22. The unitcell parameters and chemical composition imply that rengeite is the Sr and Zr-analogue of perrierite or high-β analogue of strontiochevkinite. It is transparent, dark brown with adamantine lustre. Its streak is pale greenish brown, and no cleavage was observed. The hardness is VHN100 606–698 kg mm−2 (Mohs 5–5.5). The calculated density is 4.12 g cm−3. It is strongly pleochroic from pale green to pale greenish brown where the REE contents are <1 wt.% and pale violet to greenish brown where the REE contents are between 3 and 10 wt.%. It occurs as anhedral grains in close association with titanite, zircon and tausonite in a pebble of blue titanian omphacite-jadeite rock from the seashore of Oyashirazu, Ohmi Town, in a boulder of lavender-coloured Ti-bearing jadeitite from the bed of the Kotaki-gawa river, Itoigawa City, and in a boulder of green jade from the bed of the Hime-kawa river, Itoigawa City, Niigata Prefecture, central Japan. Rengeite is considered to have crystallized by interaction between pre-existing minerals (rutile, anatase, titanite and zircon) and Sr-rich metamorphic fluid during later stage activity of high-P/T metamorphism. The name is for Mt. Renge near the locality and the Renge metamorphic belt where jadeitite deposits are found.

Keywords

rengeitenew mineraljadeiteperrieriteRenge metamorphic beltJapan
Type
Research Article
Information
Mineralogical Magazine , Volume 65 , Issue 1 , February 2001 , pp. 111 - 120
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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References

Bonatii, S. (1959) Chevkinite, perrierite and epidotes. Amer. Mineral., 44, 115–37.Google Scholar
Calvo, C. and Faggiani, R. (1974) A re-investigation of chevkinite and perrierite. Amer. Mineral., 59, 1277–85.Google Scholar
Cann, J.R. (1970) Rb, Sr, Y, Zr and Nb in some ocean floor basaltic rocks. Earth Planet. Sci. Lett., 10, 7–11.CrossRefGoogle Scholar
Coish, R.A. (1977) Ocean floor metamorphism in the Betts Cove Ophiolite, Newfoundland. Contrib. Mineral. Petrol., 60, 255–70.CrossRefGoogle Scholar
Haggerty, S.E. and Mariano, A.N. (1983) Strontianloparite and strontio-chevkinite: Two new minerals in rheomorphic fenites from the Paraná Basin carbonatites, South America. Contrib. Mineral. Petrol., 84, 365–81.CrossRefGoogle Scholar
Imaoka, T. and Nakashima, K. (1994) Chevkinite in syenites from Cape Ashizuri, Shikoku Island, Japan. Neues Jahrb. Mineral. Mh., 358–66.Google Scholar
Ito, J. (1967) A study of chevkinite and perrierite. Amer. Mineral., 52, 1094–104.Google Scholar
Izett, G.A. and Wilcox, R.E. (1968) Perrierite, chevkinite and allanite in upper Cenozoic ash beds in the western United States. Amer. Mineral., 53, 1558–67.Google Scholar
Jaffe, H.W., Evans, H.T. and Chapman, R.W. (1956) Occurrence and age of chevkinite from the Devil's Slide fayalite quartz syenite near Stark, New Hampshire. Amer. Mineral., 41, 474–87.Google Scholar
Kawano, Y. (1939) A new occurrence of jade (jadeite) in Japan and its chemical properties. J. Japan. Assoc. Mineral. Petrol. Econ. Geol., 22, 195–201 (in Japanese).Google Scholar
Komatsu, M. (1990) Hida “Gaien” Belt and Joetsu Belt. Pp. 25–40 in: Pre-Cretaceous terranes of Japan (Ichikawa, K., Mizutani, S., Hara, I., S. Hada and Yao, A., editors). Publication of IGCP Project, 224.Google Scholar
McDowel, S.D. (1979) Chevkinite from the Little Chief Granite Porphyry stock, California. Amer. Mineral., 64, 721–7.Google Scholar
Mitchell, R.S. (1966) Virginia metamict minerals: perrierite and chevkinite. Amer. Mineral, 51, 1394–405.Google Scholar
Nakajima, T., Ishiwatari, A., Sano, S., Kunugiza, K., Okamura, M., Kano, T., Soma, T. and Hayasaka, Y. (1992) Geotraverse across the Southwest Japan Arc: an overview of tectonic setting of Southwest Japan. In 29th IGC Field Trip Guide Book, vol. 5: Metamorphic belts and related plutonism in the Japanese Islands (Kato, H. and Noro, H., editors). Geol. Surv. Japan, A25, 1–83.Google Scholar
Nishimura, Y. (1998) Geotectonic subdivision and areal extent of the Sangun belt, Inner Zone of Southwest Japan. J. Metam. Geol., 16, 129–40.CrossRefGoogle Scholar
Portnov, A.M. (1964) Strontium perrierite in the North Baikal region. Dokl. Acad. Sci. USSR Earth Sci. Sec., 156, 118–20.Google Scholar
Segalstad, T.V. and Larsen, A.O. (1978) Chevkinite and perrierite from the Oslo region, Norway. Amer. Mineral., 63, 499–505.Google Scholar
Shannon, R.D. and Prewitt, C.T. (1969) Effective ionic radii in oxides and fluorides. Acta Crystallogr., B25, 925–46.CrossRefGoogle Scholar
Tatusmi, Y. and Kogiso, T. (1995) Polynesian Super Plume: A window down to the core/mantle boundary. Pp. 357–67 in: The Earth's Central Part: Its Structure and Dynamics (Yukutake, T., editor). Terra Scientific Publishing Co., Tokyo.Google Scholar
Wood, D.A., Gibson, I.L. and Thompson, R.N. (1976) Elemental mobility during zeolite facies metamorphism of the Tertiary basalts of eastern Iceland. Contrib. Mineral. Petrol., 55, 241–54.CrossRefGoogle Scholar