Pyrite and Astrophyllite Optical Properties

Pyrite

Astrophyllite

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1 Optical Properties

1.1 Luster

Not Available

Greasy, Pearly

1.2 Pleochroism

Not Available

Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

OpaqueHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) More from other references

Translucent

1.5 Refractive Index

Not Available1.678-1.758

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Isometric

Triclinic

1.8 Birefringence

Not Available0.050

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Translucent

Pyrite and Astrophyllite Optic Character

Pyrite and Astrophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Pyrite and Astrophyllite 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 Pyrite and Astrophyllite 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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Pyrite and Astrophyllite Transparency

Similar to their colors, Pyrite and Astrophyllite 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, Pyrite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli while Pyrite is Blue Chart Gem Identification (2010) More from other references and OpaqueHerve Nicolas Lazzarelli in appearance.