Gedrite from Glen Urquhart, Inverness-shire

G. H. Francis

doi:10.1180/minmag.1955.030.230.04

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Francis, G. H. 1955. Zoned Hydrothermal Bodies in the Serpentinite Mass of Glen Urquhart (Inverness-shire). Geological Magazine, Vol. 92, Issue. 06, p. 433.

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Mineralogical Magazine and Journal of the Mineralogical Society, Volume 30, Issue 230
September 1955 , pp. 709-716
This volume was published under a former title. See this journal's title history.

Gedrite from Glen Urquhart, Inverness-shire

G. H. Francis ^(a1)

- https://doi.org/10.1180/minmag.1955.030.230.04
- Published online: 14 March 2018

Abstract

This note describes a hydrous gedrite from Glen Urquhart for which the presence of an appreciable excess of oxygen atoms over the normal 96 per unit cell has been established. This is associated with an approximately equal deficiency of cations. The type of isomorphous replacement here discussed is hitherto unrecorded in the amphibole group.

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page 709 note 1 Heddle, M.F., Min. Scotland, 1901, vol. 2, p. 40.

page 710 note 1 Rabbitt, j.C., Amer. Min., 1948, vol. 33, p. 263. [M.A. 10-416.]

page 711 note 1 Trace implies that the element is present, but below the limit of quantitative determination.

page 712 note 1 Heddle, M.F., Min. Mag., 1882, vol. 4, p. 213.

page 712 note 2 Lacroix, A., Bull. Soc. Min. France, 1888, vol 9, p. 7 .

page 712 note 3 E S. Dana, Syst. Min., 6th edn., 1892, p. 384.

page 712 note 4 Heddle, M. F., Min. Scotland, 1901, vol. 2, p. 40 .

page 712 note 5 Hey, M.H., Min. Mag., 1954, vol. 30, p. 481. assuming the following possible errors in the chemical analysis: SiO2 0“3 %; AlsOa and H∼O 0-2 %; MgO 0.15 %; total iron as FeeOa, FeO, and Na20 0.10 %; TiO2, CaO, and K20 0.05 %; MnO %.

page 713 note 1 In fact, to regard HsO§ as an impurity, rather than essential, will almost invariably increase the apparent oxygen atoms per unit cell in any nfineral. More specifically, it will do so whenever the percentage of oxygen in the mineral is greater than 88/(D + 1), where Dis the density of the mineral. Or, if molecular ratios are calculated in the usual way by division of the percentages of the several oxides by their molecular weights, and an oxygen ratio Rois derived from the molecular ratios, interpretation of H20 + as an impurity will increase the apparent oxygen atoms per unit cell if Ro >5-51/(D+1).

page 713 note 2 McConnell, D., Amer. Min., 1950, vol. 35, p. 166.[M.A. 11-220]; Clay Minerals Bull., 1951, vol. 1, p. 179.

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Gedrite from Glen Urquhart, Inverness-shire

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