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A new review of the chlorites
Tập 30 Số 224 - Trang 277-292 - 1954
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...
The atomic structure of fluor-apatite and its relation to that of tooth and bone material. (With Plates XVI-XVIII.)
Tập 27 Số 194 - Trang 254-257 - 1946
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...
The infra-red spectra of talc, saponite, and hectorite
Tập 31 Số 241 - Trang 829-845 - 1958
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...
The mechanism of oxidation in titanomagnetites: a magnetic study
Tập 36 Số 277 - Trang 29-37 - 1967
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...
The residual liquids of crystallizing magmas
Tập 22 Số 134 - Trang 539-560 - 1931
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...
Potash-rich volcanic rocks from southern Spain
Tập 36 Số 279 - Trang 364-379 - 1967
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 ...