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An example of Quartz twinned on the primary rhombohedron

Published online by Cambridge University Press:  14 March 2018

Julien Drugman
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Extract

Examples of quartz twinned on a face of the primary rhombohedron R are extremely rare. Only three isolated examples have so far been recorded. The first was observed by Q. Sella; but as his crystal could not be measured, owing to its position on the matrix, it is of only slight importance as evidence of this mode of twinning of quartz.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 16 , Issue 74 , October 1911 , pp. 112 - 117
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1911

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References

Page 112 note 1 Sella, Q., Mem. Accad. Sci. Torino, 1858, ser. 2, vol. xvii, p. 821 Google Scholar.

Page 112 note 2 Rose, G., Ann. Phys. Chem. (Poggendorff), 1851, vol. lxxxiii, p. 461 Google Scholar.

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Page 112 note 4 Hintze, C., ‘Handbuch der Mineralogie,’ 1905, vol. i, p. 1857 Google Scholar.

Page 113 note 1 Goldschmidt, V., ‘Quarzzwilling nach r = 10,’ Min. Petr. Mitt. (Tschermak), 1905, vol. xxiv, pp. 157–166 CrossRefGoogle Scholar.

Page 113 note 2 Goldschmidt, V., ‘Über die Zwillingsgesetze des Quarz,’ tom. cit., pp. 167–182 Google Scholar.

Page 113 note 3 Michel Lévy, A., ‘Sur le porphyre bleu de l'Esterel,’ C. R. Soc. Géol. France, 1896, pp. xlvii–xlix Google Scholar ; and Bull. Serv. Carte Géol. France, 1897, vol. ix, no. 57, pp. 1-47, pls. I-VIII.

Page 114 note 1 Friedel, O., Bull. Soc. franç. Min., 1902, vol. xxv, p. 112 Google Scholar.

Page 116 note 1 Goldsehmidt, V., ‘Über Quarz,’ Zeits. Kryst. Min., 1908, vol. xliv, pp. 407–416 Google Scholar.

Page 116 note 2 Sella, Q., Mem. Accad. Sci. Torino, 1858, vol. xvii, p. 823 Google Scholar.

Page 117 note 1 Jenzsch, G., Ann. Phys. Chem. (Poggendorff), 1867, vol. cxxx, p. 597 CrossRefGoogle Scholar ; 1868 vol. cxxxiv, p. 540.