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On a Micro-granite containing Riebeckite from Ailsa Craig

Published online by Cambridge University Press:  14 March 2018

J. J. H. Teall
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Extract

Riebeckite was first described by Sauer in 1888. The type-mineral occurs in granite from Socotra collected by Dr. E. Riebeck.

In the same year Harker identified the peculiar blue hornblende occurring in the quartz-porphyry of Mynydd Mawr with the mineral described by Sauer, and in the following year two fresh localities were given for this mineral by Le Verrier and Lacroix. The last mentioned observer has also shown that croeldolite must be referred to the same group of hornblendes.

The object of this communication is to place on record the occurrence of riebeckite in the so-called syenite of Ailsa Craig, the small island which stands at the entrance to the Firth of Clyde.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 9 , Issue 43 , March 1891 , pp. 219 - 221
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1891

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References

page 219 note 1 Ueber Riebeekit, ein neues Glied der Hornbledegruppe. Zeitschr. d. deutsch. geol. Geiell. Band XL. (1888), p. 138.

page 219 note 2 Additional note on the blue hornblende of Mynydd Mawr. Geol. Mag., Decade III., Vol. V. (1888), p. 455.

page 219 note 3 Sur une venue de granulite a riebeckite de Corse Comptes Rendus, CIX. p. 88.

page 219 note 4 Sur une roche à amphibole sodigue (riebeckite), astrophyttite, pyrochlore, et zircon du Colorado. Comptes Bendus, CIX, p. 39.