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16.10.02: Andesine

Last updated

May 6, 2022
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- 16.10.01: Amazonite
- 16.10.03: Labradorite

gemology
Gemology Project

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Andesine
Chemical composition	(Na,Ca)[Al(Si,Al)Si₂O₈]
Crystal system	Triclinic
Habit	Prismatic
Cleavage	Distinct to perfect
Fracture	Conchoidal
Hardness	6.5
Optic nature	Biaxial +/-
Refractive index	1.551 - 1.560
Birefringence	0.009
Specific gravity	2.67
Lustre	Sub-vitreous

File:Andesine1.JPG

Figure $\PageIndex{1}$ : Congolese andesine

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