Staurolite and Pyrophyllite Optical Properties

Staurolite

Pyrophyllite

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1 Optical Properties

1.1 Luster

Resinous

Pearly

1.2 Pleochroism

X = colorless; Y = pale yellow; Z = golden yellow

NilArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Blue Chart Gem Identification (2010) More from other references

Translucent

1.5 Refractive Index

1.736-1.7621.534-1.601

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.009-0.0150.050

0 0.296

1.9 Clarity

Blue Chart Gem Identification (2010) More from other references

Translucent

Staurolite and Pyrophyllite Optic Character

Staurolite and Pyrophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Staurolite and Pyrophyllite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Staurolite and Pyrophyllite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Staurolite and Pyrophyllite Transparency

Similar to their colors, Staurolite and Pyrophyllite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Staurolite is Blue Chart Gem Identification (2010) More from other references while Staurolite is Blue Chart Gem Identification (2010) More from other references in appearance.