- 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...
- 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...
-
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...
- U,H,etc... concentrations.
Solubility Insoluble Other characteristics Fluorescent and radioactive, May form
pleochroic halos, Relief: high References...
-
amorphous (metamict state); the
optical result,
termed a
radioactive halo or
pleochroic halo, is
observable with
various techniques, such as thin-section petrography...
-
through prolonged annealing. A
related phenomenon is the
formation of
pleochroic halos surrounding minute zircon inclusions within a
crystal of biotite...
- nω = 1.990–2.010 nε = 2.093–2.100
Birefringence δ = 0.103
Pleochroism Pleochroic haloes have been observed.
Dichroic in yellow, green, red, brown, usually...
-
hardness 4.5
Luster diamond to gl****
Streak white to
grayish yellow Diaphaneity transparent to
opaque Density 6.1–6.6 (calculated)
Pleochroism non-
pleochroic...
-
Identification Color White Cleavage Distinct/Good
Lustre Vitreous Streak White Density 2.21 g/cm3
Pleochroism Non-
pleochroic Dispersion r > v weak References...
