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Biotite
Biotite

Feldspar
Feldspar



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Biotite
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Feldspar

Biotite and Feldspar Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Pearly
Vitreous
1.2 Pleochroism
Strong
None
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
Transparent, Translucent
1.5 Refractive Index
1.565-1.6251.518-1.570
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Triclinic or monoclinic
1.8 Birefringence
0.03-0.070.008-0.010
Achroite
0 0.296
1.9 Clarity
Not Available
Transparent

Biotite and Feldspar Optic Character

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

Biotite and Feldspar Transparency

Similar to their colors, Biotite and Feldspar 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, Biotite is Not Available while Biotite is Not Available in appearance.