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Uniaxial Minerals sorted by Index of Refraction |
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Uniaxial Minerals sorted by Index of Refraction |
( Bold - Valid Mineral Name)
(* - Mineral Name is Not IMA Approved)
(! - New Dana Classification Number Has Been Changed or Added)
(? - IMA Discredited Mineral Species Name)
(# - Grandfathered as valid)
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| Mineral Name | A | B | Sign | Bire | Pleo- chroic |
Dispersion |
| Mcgovernite # | 1.757 ω | 1.76 ε | U+ | .0030 | No | |
| Benitoite # | 1.757 ω | 1.804 ε | U+ | .0470 | No | |
| Harrisonite ! | 1.759 ε | 1.77 ω | U- | .0110 | Yes | |
| Theophrastite | 1.759 to 1.76 ω | 1.759 to 1.76 ε | U+ | .0000 | No | |
| Corundum # | 1.76 ε | 1.768 ω | U- | .0080 | No | none |
| Kapellasite ! | 1.76 ε | 1.8 ω | U- | .0400 | Yes | |
| Mallestigite ! | 1.76 ω | 1.801 ε | U+ | .0410 | Yes | |
| Hydroxylbastnasite-(Ce) | 1.76 ω | 1.87 ε | U+ | .1100 | No | |
| Cappelenite-(Y) # | 1.76 | U | No | |||
| Molybdophyllite # | 1.761 ε | 1.815 ω | U- | .0540 | No | |
| Fresnoite | 1.765 ε | 1.775 ω | U- | .0100 | Yes | |
| Henritermierite | 1.765 ω | 1.8 ε | U+ | .0350 | No | |
| Stillwellite-(Ce) # | 1.765 to 1.784 ω | 1.78 to 1.787 ε | U+ | .0150 | No | |
| Dorallcharite | 1.768 ε | 1.822 ω | U- | .0540 | No | |
| Cyrilovite # | 1.769 ε | 1.803 ω | U- | .0340 | No | |
| Swedenborgite # | 1.77 ε | 1.772 ω | U- | .0020 | Yes | |
| Britholite-(Ce) # | 1.77 ε-ω | 1.81 ε-ω | U-+ | .0400 | Yes | |
| Nabokoite | 1.773 ε | 1.778 ω | U- | .0050 | No | |
| Atlasovite | 1.776 ε | 1.783 ω | U- | .0070 | No | |
| Claringbullite | 1.78 ε | 1.782 ω | U- | .0020 | No | |
| Manganarsite | 1.78 ε | 1.81 ω | U- | .0300 | No | |
| Nanlingite | 1.78 ε | 1.82 ω | U- | .0400 | No | |
| Sitinakite | 1.78 ω | 1.988 ε | U+ | .2080 | No | |
| Thorite # | 1.78 to 1.82 ε | 1.79 to 1.84 ω | U- | .0100 to .0200 | Yes | none |
| Plumbojarosite # | 1.783 ε | 1.878 ω | U- | .0950 | Yes | none |
| Chernovite-(Y) | 1.783 ω | 1.879 ε | U+ | .0960 | Yes | |
| Argentojarosite # | 1.785 ε | 1.882 ω | U- | .0970 | No | |
| Fluorbritholite-(Ce) | 1.786 ε | 1.792 ω | U- | .0060 | Yes | |
| Szymanskiite | 1.786 ε | 1.795 ω | U- | .0090 | Yes | |
| Ashburtonite | 1.786 ω | 1.8 ε | U+ | .0140 | No | |
| Turtmannite ! | 1.787 ε | ω | U- | No | ||
| Painite # | 1.787 to 1.789 ε | 1.815 to 1.816 ω | U- | .0280 | Yes | |
| Philipsbornite | 1.79 ε-ω | 1.79 ε-ω | U-+ | .0000 | No | |
| Ferrotaaffeite-6N3S | ε | 1.79 ω | U- | Yes | ||
| Sabelliite ! | 1.797 ε | 1.802 ω | U- | .0050 | No | |
| Martyite ! | 1.797 ω | 1.806 ε | U+ | .0090 | Yes | |
| Stishovite | 1.799 ω | 1.826 ε | U+ | .0270 | No | |
| Kinichilite | 1.8 ω | 1.8 ε | U+ | .0000 | Yes | |
| Ferronigerite-2N1S # | 1.8 ω | 1.81 ε | U+ | .0100 | Yes | |
| Kleberite * | 1.8 to 2 | U | No | |||
| Magnesionigerite-2N1S | 1.802 ω | 1.814 ε | U+ | .0120 | No | |
| Magnesionigerite-6N6S ! | 1.802 ω | 1.814 ε | U+ | .0120 | No | |
| Magnesiohogbomite-6N6S # | 1.803 ε | 1.853 ω | U- | .0500 | Yes | |
| Magnesiohogbomite-2N3S | 1.803 ε | 1.853 ω | U- | .0500 | Yes | |
| Magnesiohogbomite-2N2S | 1.803 to 1.823 ε | 1.848 to 1.853 ω | U- | .0450 | Yes | |
| Kraisslite | ω | 1.805 ε | U+ | No | ||
| Cerite-(Ce) # | 1.806 to 1.81 ω | 1.81 to 1.82 ε | U+ | .0040 to .0100 | No | |
| Cerite-(La) ! | 1.81 ω | 1.82 ε | U+ | .0100 | Yes | |
| Zairite | 1.81 ε | 1.82 to 1.83 ω | U- | .0100 to .0200 | No | |
| Gaudefroyite | 1.81 ω | 2.02 ε | U+ | .2100 | Yes | |
| Aluminocerite-(Ce) ! | 1.81 to 1.816 ω | 1.812 to 1.822 ε | U+ | .0020 to .0060 | Yes | |
| Chromatite | 1.81 to 1.85 ω | 1.84 to 1.88 ε | U+ | .0300 | No | |
| Yecoraite | 1.812 ω | 1.824 ε | U+ | .0120 | No | |
| Hyttsjoite ! | 1.815 ε | 1.845 ω | U- | .0300 | Yes | |
| Holfertite ! | 1.815 ω | 1.91 ε | U+ | .0950 | Yes | |
| Herbertsmithite ! | 1.817 ε | 1.825 ω | U- | .0080 | Yes | |
| Springcreekite ! | 1.817 ε | 1.858 ω | U- | .0410 | Yes | |
| Hydroniumjarosite | 1.82 ε | 1.82 ω | U- | .0000 | No | |
| Bismite # | 1.82 ε | 2 ω | U- | .1800 | No | |
| Ferrohogbomite-2N2S ! | 1.827 ε | 1.852 ω | U- | .0250 | Yes | |
| Beaverite # | 1.83 ε | 1.85 ω | U- | .0200 | No | |
| Asbecasite | 1.83 ε | 1.86 ω | U- | .0300 | No | |
| Zincohogbomite-2N2S ! | 1.832 ε | 1.878 ω | U- | .0460 | Yes | |
| Jeanbandyite | 1.833 ε | 1.837 ω | U- | .0040 | No | |
| Percleveite-(Ce) ! | 1.84 ω | 1.846 ε | U+ | .0060 | No | |
| Paratacamite # | 1.843 ω | 1.848 ε | U+ | .0050 | Yes | |
| Dussertite # | 1.85 ε | 1.87 ω | U- | .0200 | No | |
| Zemannite | 1.85 ω | 1.93 ε | U+ | .0800 | Yes | |
| Diaboleite # | 1.85 ε | 1.98 ω | U- | .1300 | Yes | |
| Keystoneite | 1.85 ω | 1.99 ε | U+ | .1400 | No | |
| Franciscanite-VIII | 1.856 to 1.859 ω | 1.876 to 1.882 ε | U+ | .0200 to .0230 | Yes | |
| Orebroite-VIII | 1.857 ω | 1.875 ε | U+ | .0180 | No | |
| Orebroite-III | 1.857 ω | 1.875 ε | U+ | .0180 | No | |
| Franciscanite-III | 1.859 ω | 1.876 ε | U+ | .0170 | No | |
| Bystromite # | 1.86 to 1.91 | U | No | |||
| Benauite ! | 1.862 ε | 1.872 ω | U- | .0100 | No | |
| Welinite-III | 1.864 ω | 1.88 ε | U+ | .0160 | No | |
| Welinite-VIII | 1.864 ω | 1.88 ε | U+ | .0160 | No | |
| Paraniite-(Y) | 1.87 ω | 1.92 ε | U+ | .0500 | No | |
| Morelandite | 1.88 ω | 1.884 ε | U+ | .0040 | No | |
| Denningite | 1.89 ω | 2 ε | U+ | .1100 | No | |
| Wakefieldite-(La) ! | 1.9 ω | 1.9 ε | U+ | .0000 | Yes | |
| Trippkeite # | 1.9 ω | 2.12 ε | U+ | .2200 | No | |
| Laurelite | 1.903 ω | 1.946 ε | U+ | .0430 | No | |
| Ganomalite # | 1.91 ω | 1.945 ε | U+ | .0350 | No | |
| Daubreeite # | 1.91 ε | 2.15 ω | U- | .2400 | No | |
| Bismoclite # | 1.91 ε | 2.15 ω | U- | .2400 | No | |
| Ingersonite | 1.91 to 1.92 ε | 1.93 ω | U- | .0200 | No | |
| Burnsite ! | 1.912 ε | 1.92 ω | U- | .0080 | Yes | |
| Nasonite # | 1.913 to 1.945 ω | 1.923 to 1.971 ε | U+ | .0100 to .0260 | No | |
| Scheelite # | 1.918 to 1.92 ω | 1.934 to 1.937 ε | U+ | .0160 to .0170 | No | none |
| Rosiaite ! | 1.92 ε | 2.092 ω | U- | .1720 | No | |
| Zircon # | 1.92 to 1.96 ε | 1.967 to 2.015 ω | U- | .0470 to .0550 | Yes | none |
| Cumengite # | 1.926 ε | 2.041 ω | U- | .1150 | No | |
| Phosphohedyphane ! | 1.928 ε | 1.935 ω | U- | .0070 | No | |
| Belkovite ! | 1.928 ω | 2.002 ε | U+ | .0740 | No | |
| Corkite # | 1.93 ε | 1.93 ω | U- | .0000 | No | |
| Hafnon | 1.93 to 1.97 ω | 1.98 to 2.03 ε | U+ | .0500 to .0600 | No | |
| Graphite # | ε | 1.93 to 2.07 ω | U- | No | ||
| Kintoreite | 1.935 ε | 1.935 to 1.955 ω | U- | .0000 | Yes |