Hostname: page-component-7bb8b95d7b-dtkg6 Total loading time: 0 Render date: 2024-09-13T04:45:55.940Z Has data issue: false hasContentIssue false
  • English
  • Français

The orthoclase-microcline inversion

Published online by Cambridge University Press:  14 March 2018

Wm. Scott MacKenzie
Wm. Scott MacKenzie*
Affiliation:
Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C.
Get access Rights & Permissions [Opens in a new window]

Extract

The association of orthoclase and microcline in the same rock has been commented on by many writers, and from these occurrences attempts have been made to deduce the relative stability of these two low-temperature forms of potash-felspar. Ahnost all investigators have concluded that nlicrocline is the lower-temperature modification, but difficulties in explaining the relationship of adutaria to orthoclase and microcline have been encountered.

The identification of the monoclinie potash-felspar in association with microcline is almost always based on optical properties, viz. straight extinction in the zone [010] or the absence of visible multiple twinning.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 225 , June 1954 , pp. 354 - 366
Copyright
Copyright © 1954, The Mineralogical Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Andersen, (O.), 1928. The genesis of some types of feldspar from granite pegmatites. Norsk Geol. Tidsskr., vol. 10, pp. 116407.Google Scholar
Barth, (T.F.W.), 1934. Polymorphic phenomena and crystal structure. Amer. Journ. Sci., ser. 5, vol. 27, pp. 273.286. [M.A. 6-64.]Google Scholar
Donnay, (G.) and Donnay (H, J.D..), 1952. The symmetry change in the hightemperature alkali-feldspar series. Amer. Journ. Sci., Bowen volume, pp. 115. 132. [M.A. 1-96.]Google Scholar
Faancis, (G.H.), 1952. Unpublished Ph.D. Thesis, Cambridge University, England.Google Scholar
Lavis, (F.), 1950. The lattice and twinning of microcline and other potash feldspars. Journ. Geol., vol. 58, pp. 548.571. [M.A. 11-327.]Google Scholar
Faancis, (G.H.), 1951. A revised orientation of mierocline and its geometrical relation to albite and cryptoperthites. Journ. Geol., vol. 59, pp. 510511. [M.A. 11-490.]Google Scholar
Faancis, (G.H.), 1952. Phase relations of the alkali feldspars. Journ. Geol., vol. 60, pp. 436. 450, 549-574. [M.A. 12-136.]Google Scholar
Mackenzie, (W.S.), 1952. The effect of temperature on the symmetry of hightemperature soda-rich feldspars. Amer. Journ. Sci., Bowen volume, pp. 319.mdash; 342. [M.A. 12-135.]Google Scholar
Pecora, (W.T.), 1942. Nepheline syenite pegmatites, Rocky Boy stock, Bearpaw Mountains, Montana. Amer. Min., vol. 27, pp. 397.424. [M.A. 9-173.]Google Scholar
Spencer, (E.), 1937. The potash-soda-felspars. I.Thermal stability. Min. Mag., vol. 24, pp. 453.494.Google Scholar
Vogt, (J.H.L.), 1926. The physical chemistry of the magmatic differentiation of igneous rocks, I I.On the feldspar diagram Or: Ab: An. Skrifter Norske Vidensk. Akad., Mat.-natur. KI., no. 4, pp. 1.101. [M.A. 8-379.]Google Scholar