cannot exhibit pleochroism. Tourmaline is notable for exhibiting strong pleochroism. Gems are sometimes cut and set either to display pleochroism or to hide...

the United States are required to be disclosed at the point of sale. Pleochroism has a physical property in which the gemstone will appear to have multiple...

word meaning "two-colored rock", a reference to cordierite's strong pleochroism. It has also been called "water-sapphire" and "Vikings' Compass" because...

cornflower blue to colorless to light yellow pleochroism, while yellow materials show light yellow to colorless pleochroism. This mineral is also piezoelectric...

noticeable. This property, known as "pleochroism" is of great value in the determination of mineral composition. Pleochroism is often especially intense in...

characteristic shade of yellowish-green or pistachio-green. It displays strong pleochroism, the pleochroic colors being usually green, yellow and brown. Clinozoisite...

Mg) to grandidierite (Mg, Fe). Grandidierites display strong trichroic pleochroism. That means that it can show three different colors depending on the...

Mohs hardness of 7 and a specific gravity of 3.3 to 3.4. Crystals show pleochroism from red to blue to violet. Dumortierite quartz is blue colored quartz...

polarizations.[dubious – discuss] This is more generally referred to as pleochroism, and the technique can be used in mineralogy to identify minerals. In...

Waxy Streak White Diaphaneity Translucent Specific gravity 2.58–2.64 Refractive index 1.530–1.540 Birefringence up to +0.004 (B-G) Pleochroism Absent...

Morocco, Chile, British Columbia and several locations in Germany. The pleochroism of roselite depends on chemical composition with darker-rose-colored...

For vauxite r > v, 2V is greater for red light than for violet light. Pleochroism is the phenomenon of crystals appearing to change color as they are rotated...

It is hard, dense, black and usually automorphic, with a red-brown pleochroism in petrographic thin section. Minerals portal List of minerals Classification...

iridescence, although the colors are actually the result of unusually strong pleochroism. Andalusite is a common metamorphic mineral which forms under low pressure...

20th ed., ISBN 0-471-80580-7 Faye, G. H.; Nickel, E. H. (1971). "On the pleochroism of vanadium-bearing zoisite from Tanzania" (PDF). The Canadian Mineralogist...

Hiddenite has a strong vitreous luster and displays strong colors due to pleochroism. In addition to the North Carolina locality, Hiddenite has been found...

such as straight extinction, much weaker double refraction and stronger pleochroism. They also have a prismatic cleavage that is perfect in two directions...

brown, or green, and the luster is usually vitreous to pearly. The pleochroism is strong, the hardness is 5–6, and the specific gravity is 3.4–3.9....

or radiohalo, is a microscopic, spherical shell of discolouration (pleochroism) within minerals such as biotite that occurs in granite and other igneous...

Adamantine Streak White Specific gravity 3.52±0.01 Density 3.5–3.53 g/cm3 Polish luster Adamantine Optical properties None Birefringence None Pleochroism None...

Klein.ISBN 0-471-25177-1 Faye, G H; Nickel, E H (1968). "The origin of pleochroism in erythrite" (PDF). The Canadian Mineralogist. 9: 492–504. Wikimedia...

Galleries Faye, G. H.; Nickel, E. H. (1969). "On the origin of colour and pleochroism of kyanite" (PDF). The Canadian Mineralogist. 10: 35–46. Wikimedia Commons...

Alexandrite displays a colour change dependent upon light, along with strong pleochroism. The gem results from small-scale replacement of aluminium by chromium...

pale to deep greenish brown or brown color, with moderate to strong pleochroism. Biotite has a high birefringence which can be partially masked by its...

6–7 Diaphaneity Translucent, opaque Specific gravity 2.9–3.38 Refractive index 1.600–1.688 Birefringence 0.020–0.027 Pleochroism Absent Dispersion None...

1.550 nβ = 1.589 – 1.594 nγ = 1.589 – 1.600 Birefringence δ = 0.051 Pleochroism Weak in dark varieties Ultraviolet fluorescence Short UV: orange yellow;...

index nω = 1.564–1.595 nε = 1.568–1.602 Birefringence δ = 0.0040–0.0070 Pleochroism Weak to distinct Ultraviolet fluorescence None (some fracture-filling...

Rainbow lattice sunstone Long, Bill (2004), "Varieties of Light II: Pleochroism, Nacreous, Adularescence, A(d)venturescence Archived 2008-12-29 at the...

gemstone with varieties kunzite and hiddenite noted for their strong pleochroism. Source localities include Democratic Republic of Congo, Afghanistan...

hue with viewing direction through the crystal that would arise from pleochroism. Alexandrite from the Ural Mountains in Russia can be green by daylight...