Astrophyllite and Rosasite Optical Properties

Astrophyllite

Rosasite

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1 Optical Properties

1.1 Luster

Greasy, Pearly

Silky, Vitreous

1.2 Pleochroism

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

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent

Not Available

1.5 Refractive Index

1.678-1.7581.672-1.688

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Triclinic

monoclinic

1.8 Birefringence

0.0500.139-0.143

0 0.296

1.9 Clarity

Translucent

Not Available

Astrophyllite and Rosasite Optic Character

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

Similar to their colors, Astrophyllite and Rosasite 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, Astrophyllite is Translucent while Astrophyllite is Translucent in appearance.