- crystallography, the
hexagonal crystal family is one of the 6
crystal families,
which includes two
crystal systems (hexagonal and
trigonal) and two
lattice systems...
-
lattice systems,
crystal systems and
crystal families. The
various classifications are
often confused: in
particular the
trigonal crystal system is often...
- that is a
hexagonal crystalline lattice belonging to the
trigonal crystal system,
crystals that
sometimes exhibit twinning.
Cinnabar has been used for...
-
regardless of a
quartz crystal's size or shape, its long
prism faces always joined at a
perfect 60° angle.
Quartz belongs to the
trigonal crystal system at room...
-
distortion of the
crystal lattice. Some
directions and
planes are
defined by
symmetry of the
crystal system. In monoclinic,
trigonal, tetragonal, and hexagonal...
-
These are both
silica minerals, but they
differ in that
quartz has a
trigonal crystal structure,
while moganite is monoclinic. Chalcedony's
standard chemical...
- as follows. If the
crystal system is not
trigonal then the
lattice system is of the same type. If the
crystal system is
trigonal, then the
lattice system...
- and
specimens must be
handled with
great care. It is a
trigonal mineral,
forming 6-sided
crystals that are
terminated by rhombohedra. It is po****r with...
-
synthetically in
laboratories for
industrial or
decorative purposes in
large crystal boules.
Because of the
remarkable hardness of sapphires – 9 on the Mohs...
-
close ****ng,
reducing the
space group symmetry to R3c and the
crystal class to
trigonal. The
structure of
corundum is
sometimes described as a pseudohexagonal...
