Almandine Garnet and Astrophyllite Optical Properties

Almandine Garnet

Astrophyllite

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1 Optical Properties

1.1 Luster

Vitreous

Greasy, Pearly

1.2 Pleochroism

Not Available

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Translucent

1.5 Refractive Index

1.780-1.8101.678-1.758

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

Transparent to translucent

Translucent

Almandine Garnet and Astrophyllite Optic Character

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

Similar to their colors, Almandine Garnet 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, Almandine Garnet is Translucent, Transparent and Transparent to translucent while Almandine Garnet is Translucent, Transparent and Transparent to translucent in appearance.