Gemological properties of Afganite

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Afganite Properties

S.No

Description

 Physical properties / Optical properties

1

Chemical formula


(Na,Ca,K)8(Si,Al)12O24(SO4,Cl,CO3)3•(H2O)

2

Group

Cancrinite

3

Crystal system

Hexagonal

4

Color

Mostly Blue

5

Specific gravity

2.56 to 2.85

6

Hardness

5.5 to 6

7

Durability

Fair

8

R.I

1.522 to 1.533

9

Fluoresce

Bright orange in long waves / inert in short waves

10

Optical sign

Uniaxial negative

11

Inclusions

May be speckled of dark blue inclusions of Lazurite

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