Mineralogical Magazine and Journal of the Mineralogical Society

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P. B. Moore

The crystal structure of joesmithite: a preliminary note

joesmithite的晶体结构：初步说明

Danielle Velde

A new occurrence of priderite

普里德石的新发现

Summary The orientation of the boundaries of out-of-step domains in ‘transitional’ anorthite has been deduced from the direction of elongation of the diffuse X-ray reflections h + h + l = 2 n + 1 in selected precession photographs. The reflections are elongated normal to which is in the zone and contains the body-centring vector (a+b−c)/2. The structure is presumed to be perfect parallel to . Atoms in essentially identical, primitive anorthite-like domains are related across the out-of-step domain boundaries by body-centring vectors. Increasing diffuseness of the h + k + l = 2 n + 1 reflections indicates progressively smaller domains (more frequent domain boundaries), and when thesereflections disappear, the structure has become body-centred on the average.

Paul H. Ribbe

Alan A. Colville

Orientation of the boundaries of out-of-step domains in anorthite

斜长石中失步域边界的取向

Summary Curves relating spacing, Or content, and structural state of alkali feldspars are reviewed. Discrepancies between the compositions of heated natural perthitic alkali feldspars determined by this method and by chemical analysis are discussed and shown to be largely consistent with incomplete homogenization.

Ian Parsons

Homogeneity in alkali feldspars

碱性长石中的均质性

Summary Segregations of compact chlorite from ultramafic belts in New South Wales have been examined using chemical, X-ray, differential thermal, and electronprobe techniques. The chlorites vary from pennine to sheridanite. Some segregations occupy the central zone in metasomatic sequences of altered chromite, chlorite, and lizardite; but others may have formed at junctions of serpentinite and rodingite.

H. G. Golding

P. Bayliss

Compact chlorite associated with lizardite from New South Wales, Australia

澳大利亚新南威尔士州与利蛇纹石伴生的紧凑型绿泥石

(D. M.) Chizhikov and (V. P.) Shchastlivyi. Selenium and selenides. Translated from the Russian by E. M. Elkin. London (Collet), xvi+403 pp., 223 figs., 76 tables. Price 152s. 6d. - Volume 36 Issue 284

None R. A. H.

(D. M.) Chizhikov and (V. P.) Shchastlivyi. Selenium and selenides. Translated from the Russian by E. M. Elkin. London (Collet), xvi+403 pp., 223 figs., 76 tables. Price 152s. 6d.

(D. M.) 奇日科夫和 (V. P.) 沙斯特利维伊。硒与硒化物。由E. M. 埃尔金从俄语翻译。伦敦（科莱特出版社），共403页，223幅图，76张表格。售价152先令6便士。

(K. A.) Vlasov, (M. Z.) Kuz'Menko, and (E. M.) Es'Kova. The Lovozero alkali massif. (English edition translated from the 1959 publication of the Academy of Sciences, Moscow, U.S.S.R., by D. G. Fry and K. Syers and edited by S. I. Tomkeieff and M. H. Battey.) Edinburgh and London (Oliver and Boyd), 1966, xvi+627 pp., 257 figs., 201 tables. Price £12. 12s. - Volume 36 Issue 284

B. C. King

(K. A.) Vlasov, (M. Z.) Kuz'Menko, and (E. M.) Es'Kova. The Lovozero alkali massif. (English edition translated from the 1959 publication of the Academy of Sciences, Moscow, U.S.S.R., by D. G. Fry and K. Syers and edited by S. I. Tomkeieff and M. H. Battey.) Edinburgh and London (Oliver and Boyd), 1966, xvi+627 pp., 257 figs., 201 tables. Price £12. 12s.

(K. A.) 弗拉索夫，(M. Z.) 库兹缅科，(E. M.) 叶斯科娃。洛沃泽罗碱性岩体。（英文版译自1959年莫斯科苏联科学院出版的俄文版，由D. G. 弗莱和K. 西尔斯翻译，S. I. 汤姆基耶夫和M. H. 巴蒂编辑。）爱丁堡和伦敦（奥利弗和博伊德出版社），1966年，xvi+627页，257幅图，201张表格。售价£12. 12s。

None T. W. B.

(Brian) Bayly. Introduction to petrology. New Jersey (Prentice-Hall), xix+371 pp., 1968. Price 93s.

(布莱恩)贝利. 火成岩与变质岩岩石学导论. 新泽西州 (普伦蒂斯-霍尔出版社), xix+371页, 1968年. 售价93英镑.

A. G. Cockbain

Lead apatite solid-solution series

铅磷灰石固溶体系列

Summary Cell dimensions obtained from X-ray powder photographs of twenty-four natural olivines and one synthetic forsterite have been related to the cation contents by a new statistical procedure developed by M. H. Hey. Unlike conventional statistical analysis, which assumes error only in one parameter, this procedure simultaneously considers the estimated errors in all variables. Linear terms in Ca, Mn, Mg (or Fe(≡ 1-Mg-Ca-Mn)) satisfactorily account for the cell dimensions, and there was no need to invoke a term in Mg 2 . Since there are three cell dimensions and three chemical unknowns, it is theoretically possible to estimate the major cations in olivine just from the cell dimensions. However, the coefficients for Mn and Fe are so similar and the ranges of Ca and Mn are so small that the technique would be impractical. Data for ideal (Mg,Fe) olivines were estimated by adjusting the cell dimensions by linear extrapolation from the cell dimensions of tephroite and monticellite. A simple chemical term was sufficient to account for each cell dimension. The linear relation between cell volume and Mg is consistent with the complete disorder of Mg and Fe revealed by parallel single-crystal X-ray studies. The cell dimensions of a synthetic fayalite deviate significantly from those of natural fayalites after correction for the effects of Ca and Mn substitution in the latter: some structural or chemical difference, probably involving ferric iron, is indicated. No superstructure lines have been found, in contradiction to Eliséev's data.

S. J. Louisnathan

J. V. Smith

Cell dimensions of olivine

橄榄石的晶胞尺寸

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