gem identify

Before use, please read the user manual first
Refractive Index (low) between
Refractive Index (low) between - slider
Refractive Index (low) between - inputs
RI
RI
Specific Gravity (low) between
Specific Gravity (low) between - slider
Specific Gravity (low) between - inputs
DI
DI
Birefringence
Birefringence - slider
Birefringence - inputs
BF
BF
Optical Character
Optical Character
Gadolinite
2 positive, iso
RI MIN
1.770
RI MAX
1.820
DI MIN
4.00
DI MAX
4.65
BF MIN
0.010
BF MAX
0.040
Hematite
1 negative
RI MIN
2.870
RI MAX
3.220
DI MIN
4.95
DI MAX
5.28
BF MIN
0.280
BF MAX
0.280
Cinnabar
1 positive
RI MIN
2.905
RI MAX
3.256
DI MIN
8.09
DI MAX
8.10
BF MIN
0.351
BF MAX
0.351
Pyrargyrite
1 negative
RI MIN
2.880
RI MAX
3.080
DI MIN
5.82
DI MAX
5.85
BF MIN
0.200
BF MAX
0.200
Opal
iso, aggr
RI MIN
1.370
RI MAX
1.475
DI MIN
1.95
DI MAX
2.25
BF MIN
BF MAX
Cryolite
2 positive
RI MIN
1.338
RI MAX
1.340
DI MIN
2.95
DI MAX
2.97
BF MIN
0.001
BF MAX
0.001