Materials
Materials
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Refractive Index
Any
Abbe Number
Any
Crystal System
Any
Isotropic
Formation
Any
Artificial
Measured only
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Hierarchy
RI
Abbe
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Material
RI
Abbe
System
Fits
Colors
Garnet
Almandine-Spessartine
1.774
56
1
2
Andradite
1.889
26
1
2
Demantoid
1.885
23–24
2
5
Gahnite
1.794
54
1
—
Grossular
1.738–1.742
59–62
2
5
Pyrope
1.740–1.768
59–61
3
3
Pyrope-Almandine
1.755
28
approx
7
Rhodolite
1.755
28
approx
6
Pyrope-Spessartine
1.770
32
approx
2
Spessartine
1.802–1.803
52–55
2
7
Tourmaline
Dravite
1.650
60
approx
5
Elbaite
1.635
64
approx
28
Beryl
1.562–1.575
67–69
5
7
Aquamarine
1.574
68
1
7
Emerald
1.572–1.577
69–70
2
4
Goshenite
1.576
68
1
1
Morganite
1.590
67
1
7
Chrysoberyl
1.741–1.748
73–75
Biaxial
1
6
Cordierite
1.536–1.540
61–62
2
3
Iolite
1.536–1.540
61–62
2
3
Corundum
1.764
72
approx
5
Ruby
1.764
72
approx
5
Sapphire
1.760–1.768
72–73
Uniaxial
1
29
Cubic Zirconia
2.159
34
1
—
Diamond
2.417
55
1
1
Diopside
1.683
59
1
5
Fluorite
1.434
79–95
2
10
Forsterite
1.724
44
1
4
Peridot
1.724
44
1
4
Moissanite
2.647–2.692
24–26
Uniaxial
1
—
Quartz
1.544–1.553
68–70
Uniaxial
1
2
Amethyst
1.547
70
2
2
Smoky Quartz
1.547
60
1
—
Rhodonite
1.724–1.735
45–50
3
1
Spinel
1.715
60
2
30
Spodumene
1.667
65–68
2
—
Titanite
1.909–1.971
21–34
8
16
Topaz
1.615–1.633
78–105
5
15
Yttrium Aluminium Garnet
1.833
53
1
—
Zircon
1.939–1.954
36–45
7
25
Zoisite
1.695
62
2
6
More Materials
Actinolite
1.626
70
approx
2
Nephrite
1.615
95
approx
1
Albite
1.534
64
1
2
Amblygonite
1.600
65
approx
3
Anatase
2.535–2.537
11–12
3
1
Andalusite
1.639
69
1
7
Andesine
1.549
60
1
1
Anglesite
1.885
33
2
4
Anhydrite
1.586
74
1
1
Apatite
1.634–1.645
62–69
5
19
Apophyllite
1.536
72
approx
1
Aragonite
1.660
60
approx
1
Augelite
1.580
70
approx
1
Axinite
1.685
60
approx
4
Barite
1.640
70
1
5
Bastnäsite
1.720
30
approx
1
Benitoite
1.780
30
approx
3
Beryllonite
1.557
72–75
2
4
Brazilianite
1.602
70
approx
3
Bronzite
1.680
55
approx
1
Brucite
1.573
55
1
1
Burbankite
1.625
55
approx
1
Bytownite
1.570
55
approx
1
Calcite
1.486–1.658
50–79
Uniaxial
1
5
Cassiterite
2.017–2.030
26–27
2
2
Catapleiite
1.595
60
approx
1
Celestite
1.625
74
1
2
Cerussite
2.000
35
approx
1
Childrenite
1.680
60
approx
1
Cinnabar
2.900
10
approx
3
Clinohumite
1.640
55
approx
2
Cobaltocalcite
1.620
45
approx
1
Colemanite
1.602
72
approx
1
Crocoite
2.350
12
approx
2
Cuprite
2.670
4
1
1
Danburite
1.633
69
2
8
Datolite
1.648
65–67
2
1
Diaspore
1.725
65
1
1
Dioptase
1.674–1.677
38–54
2
1
Dolomite
1.600
45
approx
2
Enstatite
1.665
55
approx
8
Epidote
1.719–1.756
38–54
4
5
Euclase
1.659–1.660
70–73
3
5
Eudialyte
1.610
65
approx
1
Gadolinium Gallium Garnet
1.970
38
1
—
Grandidierite
1.605
65
approx
1
Hambergite
1.589
69–71
3
5
Haüyne
1.500
50
approx
1
Herderite
1.600
65
approx
5
Hornblende
1.640
60
approx
1
Hypersthene
1.700
55
approx
1
Jadeite
1.666
87
approx
1
Jeremejevite
1.645
65
approx
1
Kornerupine
1.670
70
approx
10
Kyanite
1.721
66
1
13
Labradorite
1.566
58
1
4
Leadhillite
2.000
40
approx
1
Leucite
1.509
64
1
1
Lithium Niobate
1.989–2.213
21–31
Uniaxial
1
—
Magnesite
1.700
40
approx
1
Manganotantalite
2.300
20
approx
3
Mimetite
2.138–2.141
18
2
1
Monazite
1.800
25
approx
1
Montebrasite
1.606–1.624
74–87
2
2
Musgravite
1.720
50
approx
1
Natrolite
1.483
60
approx
1
Oligoclase
1.544
62
1
2
Opal
1.450
200
approx
2
Orthoclase
1.522
60
approx
7
Moonstone
1.522
60
approx
2
Parisite
1.720
30
approx
1
Periclase
1.740
50
approx
1
Petalite
1.512
73
1
4
Pezzottaite
1.620
65
approx
2
Phenakite
1.660
70
approx
3
Phosgenite
2.100
25
approx
2
Phosphophyllite
1.608
55
approx
1
Pollucite
1.524
60
1
1
Powellite
1.980
25
approx
1
Prehnite
1.632
72
approx
5
Proustite
2.900
15
approx
1
Pyroxmangite
1.750
60
approx
1
Rhodochrosite
1.750
35
approx
6
Rutile
2.613–2.909
9–10
Uniaxial
1
2
Sanidine
1.524
63
1
1
Sapphirine
1.720
60
approx
1
Scapolite
1.553–1.579
59–64
6
15
Scheelite
1.920
25
approx
5
Scorodite
1.800
60
approx
2
Sellaite
1.380
70
approx
2
Siderite
1.870
35
approx
2
Sillimanite
1.663–1.665
55–62
3
6
Sinhalite
1.689
72
1
6
Smithsonite
1.770
35
approx
4
Sodalite
1.482–1.484
53–80
4
1
Sphalerite
2.367
15
1
3
Stibiotantalite
2.412
16
1
—
Strontium Titanate
2.408
13
1
—
Taaffeite
1.720
55
approx
7
Ulexite
1.510
55
approx
1
Vesuvianite
1.722–1.730
49–50
2
5
Vivianite
1.610
55
approx
1
Willemite
1.699–1.703
43–48
2
5
Witherite
1.700
30
approx
1
Wollastonite
1.624
50
1
1
Wulfenite
2.361–2.366
12–13
4
3
Yttrium Aluminate
1.955
45
approx
—
Zincite
2.050
20
approx
2