- or to hide it,
depending on the
colors and
their attractiveness. The
pleochroic colors are at
their maximum when
light is
polarized parallel with a prin****l...
- A
pleochroic halo, or radiohalo, is a microscopic,
spherical s**** of
discolouration (pleochroism)
within minerals such as
biotite that
occurs in granite...
-
through prolonged annealing. A
related phenomenon is the
formation of
pleochroic halos surrounding minute zircon inclusions within a
crystal of biotite...
-
trace amounts of
impurities can tint crystals, and it can be
strongly pleochroic.
Every color of the
rainbow may be
represented by elbaite, some exhibiting...
-
dispersion of the
optic axes is weak, with r<v, or non-existent.
Vivianite is
pleochroic with X= blue, deep blue or indigo-blue; Y= pale
yellowish green, pale...
-
widely used by
experienced gemologists. With the
polarizing type, only one
pleochroic color can be seen at a time. This
makes the
process time-consuming and...
- U,H,etc... concentrations.
Solubility Insoluble Other characteristics Fluorescent and radioactive, May form
pleochroic halos, Relief: high References...
- The pink
color of
morganite is
attributed to Mn2+ ions.
Morganite is
pleochroic; when it is
viewed down its
crystallographic axis the
color is more pink...
-
amorphous (metamict state); the
optical result,
termed a
radioactive halo or
pleochroic halo, is
observable with
various techniques, such as thin-section petrography...
-
allanite results in some
interesting phenomena.
Allanite often has a
pleochroic halo of
radiation damage in the
minerals immediately adjacent. Also highly...
