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16.44: Kornerupine

Last updated

May 6, 2022
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- 16.43: Jeremejevite
- 16.45: Kyanite

gemology
Gemology Project

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Kornerupine
Chemical composition	Complex borosilicate
Crystal system	Orthorhombic
Habit	Prismatic
Cleavage	Prismatic
Fracture	Conchoidal
Hardness	6.5
Optic nature	Biaxial -
Refractive index	1.67 -1.68
Birefringence	0.013
Dispersion	Low, 0.019
Specific gravity	3.28 - 3.35
Lustre	Vitreous
Pleochroism	Distinct (green, yellow, brown)

Figure $\PageIndex{1}$ : Faceted Kornerupine
Photo courtesy of The Gem Trader

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