Mineralogical Society

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A new review of the chlorites
Mineralogical Society - Tập 30 Số 224 - Trang 277-292 - 1954
Max H. Hey
The chlorites form an extensive isostructural series with a high degree of isomorphous substitution, within which it has always been difficult to define or delimit species; until recently, owing to the lack of adequate X-ray studies; several structurally distinct species were included with the group, further complicating the problem. The group comprises aluminosilicates of magnesium and iron (ferr... hiện toàn bộ
The infra-red spectra of talc, saponite, and hectorite
Mineralogical Society - Tập 31 Số 241 - Trang 829-845 - 1958
V. C. Farmer
SummaryThe absorption spectra of talc, saponite, and hectorite between 4000 and 400 cm. −1 are closely related, although the bands of the smectites are more diffuse as a result of isomorphous substitutions in the tale structure. Using oriented specimens, vibrations in which the change of dipole moment is perpendicular to the sheets of the minerals are identified, and the results compared with theo... hiện toàn bộ
The mechanism of oxidation in titanomagnetites: a magnetic study
Mineralogical Society - Tập 36 Số 277 - Trang 29-37 - 1967
W. O’Reilly, Subir K. Banerjee
SummaryA hypothesis for the mechanism of oxidation in titanomagnetites is first put forward on the basis of new oxidation data for pure magnetite and the new model for cation distribution in titanomagnetites. Contrary to previous claims by other workers, it is shown that single-phase spinel oxidation products of titanomagnetites can only be produced under very exacting circumstances. Lowtemperatur... hiện toàn bộ
The atomic structure of fluor-apatite and its relation to that of tooth and bone material. (With Plates XVI-XVIII.)
Mineralogical Society - Tập 27 Số 194 - Trang 254-257 - 1946
C. A. Beevers, Donald B. McIntyre
It is well established by X-ray crystal analysis that the mineral constituent of bone and of the enamel and dentine of teeth is essentially hydroxy-apatite Ca5OH(PO4)3, and that hydroxy-apatite has a structure differing only in small details from that of the well-crystallized mineral fluor-apatite Ca5F(PO4)3. The main difference, and in fact the only fully established one, between the two structur... hiện toàn bộ
Potash-rich volcanic rocks from southern Spain
Mineralogical Society - Tập 36 Số 279 - Trang 364-379 - 1967
G. D. Borley
SummarySeveral restricted outcrops of potash-rich volcanic rocks occur in the Spanish provinces of Murcia and Almeria, where they form intrusive pitchstones or surface lavas among country rocks consisting of Tertiary and Quaternary sediments: the volcanic rocks include jumillites and verites from the type localities of Jumilla and Vera and it is these rocks that have been investigated. Jumillites ... hiện toàn bộ
The residual liquids of crystallizing magmas
Mineralogical Society - Tập 22 Số 134 - Trang 539-560 - 1931
C. N. Fenner
In the Mineralogical Magazine for September, 1930, Dr. Frederick Walker describes 'A tholeiitic phase of the quartz-dolerite magma of central Scotland'. Several pages of the article are devoted to a consideration of the phenomena he has observed in these rocks in their bearing upon certain views which I have expressed. In most respects Dr. Walker has clearly grasped the essential features of my th... hiện toàn bộ
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