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Biotite and Actinolite Optical Properties


Actinolite and Biotite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

Pleochroism
Strong   
moderate   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references   

Refractive Index
1.565-1.625   
1.613-1.628   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
monoclinic   

Birefringence
0.03-0.07   
0.0250-0.0270   

Clarity
Not Available   
TransparentUlrich Henn and Claudio C. Milisenda   

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Biotite and Actinolite Optic Character

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

Similar to their colors, Biotite and Actinolite 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.

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