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Cordierite
Cordierite

Brucite
Brucite



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Cordierite
X
Brucite

Cordierite and Brucite Optical Properties

1 Optical Properties
1.1 Luster
Greasy, Vitreous
Vitreous, Pearly
1.2 Pleochroism
X = pale yellow
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Not Available
TransparentMichael O’Donoghue, Gems, Sixth Edition (2006)
1.5 Refractive Index
Not Available1.56-1.60
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Trigonal
1.8 Birefringence
Not Available0.010-0.020
Achroite
0 0.296
1.9 Clarity
Not Available
TransparentMichael O’Donoghue

Cordierite and Brucite Optic Character

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

Cordierite and Brucite Transparency

Similar to their colors, Cordierite and Brucite 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, Cordierite is Not Available while Cordierite is Not Available in appearance.