Kornerupine

Refractive Index
1.6700
Abbe Number
70.0
Crystal System
Isotropic (cubic)
Formation
Natural
Dispersion Data
Approximate (from n, V)
Fits
1

Refraction Fits

Fit #1— Cauchy from (n_D, V_D)

Cauchy approximation

Valid 0.38–0.78 µm

= 1.6700 = 70.0
n4004505005506006507007501.6601.6701.6801.690

Mg-Al borosilicate. GIA dispersion 0.018. Source: GIA / Winchell / Liddicoat gemological tables.

Absorption Specimens

LED
SUN
I
F
 
Kornerupine
Kenya, Coast Province (Kwale District)
Color change
LED
SUN
I
F
 
Kornerupine
Kenya, Coast Province (Kwale District)
Color change
LED
SUN
I
F
 
Kornerupine
Kenya, Coast Province (Kwale District)
LED
SUN
I
F
 
Kornerupine
Sri Lanka
LED
SUN
I
F
 
Kornerupine
Sri Lanka
LED
SUN
I
F
 
Kornerupine
Sri Lanka, Sabaragamuwa Province, Embilipitiya
LED
SUN
I
F
 
Kornerupine
Sri Lanka, Sabaragamuwa Province, Kolonne
LED
SUN
I
F
 
Kornerupine
Sri Lanka, Uva Province, Monaragala
LED
SUN
I
F
 
Kornerupine
Sri Lanka, Uva Province, Okkampitiya
LED
SUN
I
F
 
Kornerupine
Tanzania, Tanga Region (Handeni District), Kwakonje