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Alunite
Alunite

Dallasite
Dallasite



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Alunite
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Dallasite

Alunite and Dallasite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Pearly
Not Available
1.2 Pleochroism
Not Available
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Not Available
1.5 Refractive Index
1.5721.540
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Not Available
1.8 Birefringence
0.0200.008-0.010
Achroite
0 0.296
1.9 Clarity
Not Available
Not Available

Alunite and Dallasite Optic Character

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

Alunite and Dallasite Transparency

Similar to their colors, Alunite and Dallasite 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, Alunite is Not Available while Alunite is Not Available in appearance.