Structure and Properties of Quartz Crystals Grown
from Fluoride Solutions:
I. The Morphology of Basal Pinacoid Habit

A. N. Chuvyrov^{a, b} and R. M. Mazitov^b

^a Bashkir State University, Ufa, 450074 Russia

^b Institute of Physics of Molecules and Crystals, Ufa Research Center, Russian Academy of Sciences,
Ufa, 450074 Russia

e-mail: ChuvyrovAN@mail.ru

Received May 21, 2007

Abstract—The mechanism of growth of quartz crystals from fluoride media has been investigated. It is shown
by different independent methods (selective etching, X-ray diffraction analysis, optical microscopy) that the
faceted forms of autonomous growth regions (trigonal pyramids formed on nonsingular crystal faces) are unsta-
ble and degenerate during growth. This degeneracy is accompanied by torsion deformation of autonomous
growth regions and, as a result, formation of a series of hollow helical channels at boundaries of autonomous
growth regions, whose axes make an angle of ~16 with the OZ axis, and their projections on the XOY plane
are directed along the +X axes.

PACS numbers: 81.10.Aj

DOI: 10.1134/S106377450805026X

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