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Nacrite from Hirvivaara, northern Karelia, Finland. (With Plate XXVIII)

Published online by Cambridge University Press:  14 March 2018

Oleg von Knorring ,
G. W. Brindley  and
K. Hunter
Oleg von Knorring
Affiliation:
Department of Geology
G. W. Brindley
Affiliation:
Physics Laboratories, The University of Leeds
K. Hunter
Affiliation:
Physics Laboratories, The University of Leeds
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Extract

Nacrite is the rarest member of the kaolin group of minerals. The name was first applied by Brongniart in 1807 to a mineral (talc granuleux of Haüy, 1801) the properties of which were not then adequately described. In 1832 Breithaupt recorded a mineral from an ore vein near Freiberg in Saxony, which has since been called nacrite. In the past, however, 'nacrite' has been applied quite frequently to different nacreous and micaceous minerals, not necessarily of kaolin composition, and the authenticity of the species was not definitely established until 1931 when Ross and Kerr, on the basis of an X-ray study of nacrite from the locality Brand near Freiberg in Saxony, proved the mineral to be a distinct species of the kaolin group.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 218 , September 1952 , pp. 963 - 972
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1952

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References

page 963 note 1 C. S. Ross and P. F. Kerr, The kaolin minerals. Prof. Paper U.S. Geol. Surv., 1931, no. 165–E, pp. 151–176. [M.A. 5–359.]

page 963 note 2 Cross, W. and Hillebrand, W. F., Minerals from the neighbourhood of Pikes Peak. Bull. U.S. Geol. Surv., 1885, no. 20, pp. 40–74 Google Scholar.

page 967 note 1 Richardson, H. M., Phase changes which occur on heating kaolin clays. Chap. III in X–ray identification and crystal structures of clay minerals. Min. Soc., London, 1951 Google Scholar.

page 967 note 2 Samojlow, J., Über das Wasser des Kaolinits. Zeits. Kryst. Min., 1913, vol. 51, pp. 106–108 Google Scholar.

page 968 note 1 p. Niggli, J. Koenigsberger, and R. L. Parker, Die Mineralien der Schweizeralpen. Basel, 1940, p. 237. [M.A. 8–49.J

page 969 note 1 S. B. Hendricks, The crystal structure of nacrite Al2O3.2SiO2.2H2O and the polymorphism of the kaolin minerals. Zeits. Krist., 1939, vol. 100, pp. 509–518. [M.A. 7–22.]

page 969 note 2 G. W. Brindley and J. G. Ogilvie, The texture of single crystals of brucite. Acta Cryst. (to appear), 1952.

page 970 note 1 Wilson, A. J. C. and Lipson, H., The calibration of Dcbye–Schcrrer X–ray powder cameras. Proc. Physical Soc., 1941, vol. 53, pp. 245–250 CrossRefGoogle Scholar.

page 970 note 2 Gruner, J. W., The crystal structure of nacrite and a comparison of certain optical properties of the kaolin group with its structures. Zeits. Krist., 1933, vol. 85, pp. 345–354 Google Scholar. [M.A. 5 474.1

page 970 note 3 Nagelsehmidt, G., Röntgcnographische Untcrsuchungen an Tonen. 1934, Zeits. Xrist., vol. 87, pp. 120–145 Google Scholar. [M.A. 6–136.]

page 971 note 1 Present data. Nacrite from Hirvivaara, Finland. Filtered Ni– and Co–Ka radiations; camera radius 10.0 cm. Spacings in kX.

page 971 note 2and 3. Data by Nagelschmidt (1934). Nacrite from Freiberg, Saxony (2), and Kunnerstein, Augustusburg, Saxony (3). Filtered Cu–Ka radiation; camera radius 2–88 cm. Spacings apparently in Å.

page 971 note 4 Data by Gruner (1933). Nacrite from Brand, Saxony. Unfiltered Fe–K radiation; camera radius 5–73 cm. Spacings in Å.

page 971 note 5 Data by Ross and Kerr (1931). Nacrite from Brand, Saxony, and Pikes Peak, Colorado. Filtered Mo–Ka radiation. Spacings in •.