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Growth twinning in phacolite

Published online by Cambridge University Press:  05 July 2018

Mizuhiko Akizuki  and
Hiroshi Konno
Mizuhiko Akizuki
Affiliation:
Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980, Japan
Hiroshi Konno
Affiliation:
Institute of Mineralogy, Petrology, and Economic Geology, Faculty of Science, Tohoku University, Sendai 980, Japan
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Abstract

Phacolite from Mitaki, Sendai City, Japan, has a core of penetration-twinned chabazite. The crystal has a convex (0001) face on which many twin individuals are produced by a two-dimensional nucleation mechanism, resulting in complicated twinning during growth. Both the r and the faces repeat finely during growth because of twinning, resulting in {112̄3} sectors with polysynthetic twinning. Finally, single structures nucleate on the crystal edges [211̄] and develop along the (112̄3) face, penetrating each other near the centre of the face.

Keywords

phacolitechabazitezeolitesgrowth twinningMitakiJapan
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 361 , September 1987 , pp. 427 - 430
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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