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Habit types and genesis of phenakite and willemite
Author(s) -
Kostov Ivan
Publication year - 1968
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19680030418
Subject(s) - crystal twinning , acicular , supersaturation , crystallography , crystal habit , habit , materials science , crystallization , mineralogy , chemistry , microstructure , psychology , organic chemistry , psychotherapist
The crystal habits of phenakite and willemite vary from shortened along the c ‐axis to prismatic and acicular in good agreement with the chain‐like arrays of atoms and factors like temperature, rate of crystallization and supersaturation. A decrease of Si/Be and Zn/Mn ratios seems to favour shortening of the habit. Twinning in phenakite crystals becomes more frequent with higher supersaturations, whereas lack of twinning and frequent {0001} faces in willemite are explained in terms of size of the constituent atoms (Zn and Mn) and stressed covalent bonds.