Hostname: page-component-cb9f654ff-r5d9c Total loading time: 0 Render date: 2025-09-03T02:15:47.535Z Has data issue: false hasContentIssue false
  • English
  • Français

The structural formula of a hydrous amphibole

Published online by Cambridge University Press:  14 March 2018

G. D. Nicholls  and
J. Zussman
G. D. Nicholls
Affiliation:
Department of Geology, University of Manchester
J. Zussman
Affiliation:
Department of Geology, University of Manchester
Get access Rights & Permissions [Opens in a new window]

Abstract

The majority of amphiboles conform to the general structural formula X2-3Y5Z8O22(OH,F,Cl)2, where X = Na, K, Ca, Y - Mg, Fe″, Mn, A1, Fe‴, Ti, and Z = Si, A1 or Ti. Two X ions occupy the positions filled by Ca in the ideal tremolite structure; the additional X ions are assumed to occur in the 'A' sites which are vacant in tremolite.

For the amphiboles, therefore, the method most commonly adopted for deriving a formula from a chemical analysis is to assume that a total of 24 anions is present in the formula unit.

Information

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 230 , September 1955 , pp. 717 - 722
Copyright
Copyright © 1955, 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.)

Article purchase

Temporarily unavailable

References

Buddington, (A.F.) and Leonaid, (B.F.), 1953. Amer. Min., vol. 38, p. 891. [M.A. 12-374.]Google Scholar
Hey, (M.H.), 1939. Min. Mag., vol. 25, p. 402.Google Scholar
Hey, (M.H.), 1954. Min. Mag., vol. 30, p. 481.Google Scholar
Hutton, (C.O.), 1940. Mem. Geol. Surv. New Zealand, no. 5, p. 15.Google Scholar
Hutton, (C.O.), 1943. Trans. Roy. Soc. New Zealand, vol. 73, p. 174. [M.A. 9-61,]Google Scholar
Mcconnell, (D.), 1950. Amer. Min., vol. 35, p. 166. [M.A. 11-220.]Google Scholar
Mcconnell, (D.), 1951. Clay Min. Bull., vol. 1, p. 179.Google Scholar
Warren, (B.E.), 1930. Zeits. Krist., vol. 72, p. 493. [M.A. 4-278.]Google Scholar