- the
pseudohexagonal c
crystal axis and they are
divided vertically by a medial,
slightly reentrant twinning line
parallel to the
pseudohexagonal c axis...
- All
crystallize in the
monoclinic system, with a
tendency towards pseudohexagonal crystals, and are
similar in
structure but vary in
chemical composition...
- termination. It has four
prism faces and two
pinacoid faces to form a
pseudohexagonal crystal.
Although not
easily seen
because of the
cleavage and sheets...
- marbles. Both
monoclinic and
triclinic polytypes exist and both are
pseudohexagonal. It was
first described in 1837 from
localities in the Ural Mountains...
- to trigonal. The
structure of
corundum is
sometimes described as a
pseudohexagonal structure. The Young's
modulus of
corundum (sapphire) has been reported...
- Terrible, in 1568.
Micas are
distinguished from
other minerals by
their pseudohexagonal crystal shape and
their perfect cleavage,
which allows the crystals...
-
habit M****ive;
rarely as
dodecahedra Twinning Common on {111}
forming pseudohexagonal prisms Cleavage Poor on {110}
Fracture Conchoidal to
uneven Tenacity...
- acicular, tabular, prismatic, coral-like
Twinning Cyclic on {110},
forms pseudohexagonal aggregates. If polysynthetic,
forms fine
striations parallel to [110]...
- (looking
along the layers)
Chlorite structure viewed along [001]
showing pseudohexagonal structure Chlorite is
considered a clay mineral. It is a nonswelling...
-
sometimes colorless or blue. It is
usually m****ive to
fibrous with rare
pseudohexagonal orthorhombic crystals. The
mineral is
deliquescent (absorbs moisture...
