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Studies on the zeolites. Part IV. Ashcroftine (kalithomsonite of S. G. Gordon)

Published online by Cambridge University Press:  14 March 2018

Max H. Hey  and
F. A. Bannister
Max H. Hey
Affiliation:
Mineral Department of the British Museum of Natural History
F. A. Bannister
Affiliation:
Mineral Department of the British Museum of Natural History
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Extract

In 1924 S. G. Gordon described as a variety of thomsonite a pink zeolitic mineral occurring as a fine crystalline powder in cavities of augite-syenite at Narsarsuk, Greenland. The material was described as orthorhombie, with two good cleavages a(100) and b(010) and a less perfect one c(001) ; no other faces were observed on the minute prismatic crystals. The refractive indices Gordon measured as ± 1.535, ² 1.537, ³ 1.545, with the optic orientation a = b, ² = ±, ³ = c, and optic sign positive. Analysis gave the figures under I (p. 307), and as these agree with the composition to be expected for a potassiferous thomsonite, apart from the high water content, Gordon regarded it as such, and gave it the varietal name kalithomsonite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 23 , Issue 140 , March 1933 , pp. 305 - 308
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1933

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References

page 305 note 1 Part III. Natrolite and metanatrolite. Min. Mag., 1932, vol. 23, p. 243.

page 305 note 2 S. G. Gordon (J. E. Whitfield, analyst), Proc. Acad. Nat. Sci., Philadelphia, 1924, vol. 76, p. 261. [Min. Abstr., vol. 2, p. 385.]

page 306 note 1 M. H. Hey, Min. Mag., 1932, vol. 23, p. 51

page 307 note 1 1 For other examples of all three uses, see the lists of new mineral names collected by Dr. L. J. Spencer, Min. Mag., vols. 11-22.

page 307 note 2 Even Kali-Harmotom (= phillipsite) of L. Gmelin, 1825, belongs to the same isomorphous group as harmotome.

page 307 note 3 M. H. Hey, Min. Mag., 1932, vol. 23, pp. 109-110.