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Morphology, twinning, and optical orientation of gismondine

Published online by Cambridge University Press:  05 July 2018

Rab Nawaz
Rab Nawaz*
Affiliation:
Department of Geology, Ulster Museum Belfast BT9 5AB
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Summary

Gismondine is a monoclinic mineral but prior to X-ray determination of its unit cell it was variously regarded as orthorhombic, monoclinic, or triclinic on account of its intricate twinning. A study of gismondine crystals from Osa Quarry, near Rome, indicates that the morphologically dominant form is {32} which by twinning about the normal to {100} produces penetration-twinned octahedral crystals united on (100) and (001). Gismondine has poor cleavage on {32} optic plane is (010) and γ:[001] = 42.5° (in obtuse β).

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 331 , September 1980 , pp. 841 - 844
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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