巻号一覧
8 巻, 8 号
選択された号の論文の5件中1～5を表示しています
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Toshio KATO, Yasunori MIÚRA1977 年 8 巻 8 号 p. 419-430
発行日: 1977年
公開日: 2007/03/31
ジャーナル フリーThe crystal structures of jarosite and svanbergite have been refined. It was revealed that geometry of the sulphur tetrahedra in jarosite and alunite is much affected by the octahedral cations. The sulphur tetrahedra in jarosite expand nearly to maximum, and they are comparable in size to those of phosphorus tetrahedra. The six refined crystal structures of the alunite-type minerals, alunite, goyazite, crandallite, woodhouseite and these two minerals, are compared. It was found that jarosite which has Fe octahedra behaves in an exceptional manner. It seems that the geometry of other five structures which have Al octahedra is in right order from the view point of crystal chemistry.抄録全体を表示PDF形式でダウンロード (670K) -
Yoshio TAKÉUCHI1977 年 8 巻 8 号 p. 431-438
発行日: 1977年
公開日: 2007/03/31
ジャーナル フリーCation sites in pyroxenoids may be classified into two groups; those in one group has been designated as M1i (i=0, 1, 2,···), and those in the other as M2j (j=1, 2, ···). The configuration of silicate chains is mainly controlled by the size of cations at M1i. The proposed notation has much advantage in discussing crystal chemistry of pyroxenoids because in a given structural series, octahedra (or polyhedra) about sites having the same symbol share, regardless of structural type, geometrical features in common.抄録全体を表示PDF形式でダウンロード (479K) -
Chil-Sup SO1977 年 8 巻 8 号 p. 439-455
発行日: 1977年
公開日: 2007/03/31
ジャーナル フリーThirty samples of the sphalerite from sixteen Korean Pb-Zn deposits of various geologic settings were studied spectroanalytically. Variations in the trace-element contents of the sphalerite are considered in relation to geologic settings and mineralogic properties. Sphalerites from ore deposits developed in similar geologic settings and under similar physicochemical conditions are characterized by specific combinations of trace elements.抄録全体を表示PDF形式でダウンロード (1009K) -
Hiroshi KONNO, Morihiro AOKI1977 年 8 巻 8 号 p. 456-462
発行日: 1977年
公開日: 2007/03/31
ジャーナル フリーPDF形式でダウンロード (539K) -
Junji AKAI1977 年 8 巻 8 号 p. 463-471
発行日: 1977年
公開日: 2007/03/31
ジャーナル フリーA new kind of superstructure composed of single and double chains was found by high resolution electron microscopy in hydrothermally altered clinopyroxene from Akatani mine in Niigata Prefecture, Japan. The superstructure of 13.5Å was most reasonably interpreted as regular alternation of one single chain and one double chain and that of 31.5Å as regular alternation of one single chain and three double chains in the b direction. The regions of 13.5Å and 31.5Å extend to the b direction about 100∼1000Å and 150∼200Å in width respectively. Disordered structures composed of single and double chains were also often found.抄録全体を表示PDF形式でダウンロード (2220K)
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