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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 |
| Labyrinthite ! | 1.597 ω | 1.601 ε | U+ | .0040 | No | |
| Schlossmacherite | ω | 1.597 ε | U+ | No | ||
| Combeite # | 1.598 ω | 1.598 ε | U+ | .0000 | No | |
| Rastsvetaevite ! | 1.598 ω | 1.6 ε | U+ | .0020 | No | |
| Strontiowhitlockite | 1.598 ε | 1.601 ω | U- | .0030 | No | |
| Takovite # | 1.598 ε | 1.605 ω | U- | .0070 | No | |
| Carbonate-hydroxylapatite ? | 1.598 to 1.619 ε | 1.603 to 1.628 ω | U- | .0050 to .0090 | Yes | |
| Orlymanite | ε | 1.598 ω | U- | Yes | ||
| Cordylite-(Ce) # | 1.5984 ε | 1.775 ω | U- | .1766 | No | |
| Bottinoite | 1.6 ω | 1.605 ε | U+ | .0050 | No | |
| Coombsite ! | 1.6 ε | 1.619 ω | U- | .0190 | No | |
| Chladniite | 1.6 ε | 1.62 ω | U- | .0200 | No | |
| Sphaerocobaltite # | 1.6 ε | 1.885 ω | U- | .2850 | Yes | |
| Krivovichevite ! | 1.6 to 1.9 ε | 1.9 ω | U- | .3000 | No | |
| Molysite # | ε | 1.6 ω | U- | No | ||
| Pezzottaite ! | 1.601 to 1.611 ε | 1.612 to 1.62 ω | U- | .0110 | Yes | |
| Jamborite | 1.602 ε | 1.607 ω | U- | .0050 | No | |
| Fluocerite-(La) | 1.603 ε | 1.609 ω | U- | .0060 | No | |
| Calciocatapleiite | 1.603 ω | 1.639 ε | U+ | .0360 | No | |
| Huanghoite-(Ce) | 1.603 ε | 1.765 ω | U- | .1620 | No | |
| Minehillite | 1.604 ε | 1.607 ω | U- | .0030 | No | |
| Sarcolite # | 1.604 ω | 1.615 ε | U+ | .0110 | No | |
| Mopungite | 1.605 ε | 1.614 ω | U- | .0090 | No | |
| Bazzite # | 1.605 ε | 1.626 ω | U- | .0210 | Yes | |
| Sogdianite | 1.606 ε | 1.608 ω | U- | .0020 | No | |
| Turkestanite ! | 1.606 ε | 1.611 ω | U- | .0050 | Yes | |
| Saryarkite-(Y) | 1.606 ω | 1.62 ε | U+ | .0140 | No | |
| Eudialyte # | 1.606 to 1.61 ω | 1.61 to 1.613 ε | U+ | .0040 | No | none |
| Pyatenkoite-(Y) ! | 1.607 ε | 1.612 ω | U- | .0050 | Yes | |
| Fluocerite-(Ce) # | 1.607 to 1.611 ε | 1.612 to 1.618 ω | U- | .0050 to .0070 | No | |
| Raslakite ! | 1.608 ω | 1.611 ε | U+ | .0030 | Yes | |
| Metakahlerite | 1.608 ε | 1.642 ω | U- | .0340 | No | |
| Metaheinrichite # | 1.608 to 1.609 ε | 1.637 to 1.641 ω | U- | .0290 to .0320 | No | |
| Narsarsukite | 1.609 ω | 1.63 ε | U+ | .0210 | No | |
| Daqingshanite-(Ce) | 1.609 ε | 1.708 ω | U- | .0990 | Yes | |
| Khanneshite | 1.609 to 1.61 ε | 1.62 to 1.623 ω | U- | .0110 to .0130 | No | |
| Dualite ! | 1.61 ω | 1.613 ε | U+ | .0030 | No | |
| Arapovite ! | 1.61 ε | 1.615 ω | U- | .0050 | No | |
| Voronkovite ! | 1.61 ω | 1.619 ε | U+ | .0090 | Yes | |
| Gaspeite | 1.61 ε | 1.83 ω | U- | .2200 | No | |
| Mogovidite ! | 1.611 ε | 1.618 ω | U- | .0070 | Yes | |
| Bechererite ! | 1.611 ε | 1.705 ω | U- | .0940 | Yes | |
| Ikranite ! | 1.612 ω | 1.615 ε | U+ | .0030 | Yes | |
| Dravite ! | 1.612 to 1.63 ε | 1.631 to 1.655 ω | U- | .0190 to .0250 | Yes | none |
| Fuenzalidaite | 1.615 ε | 1.622 ω | U- | .0070 | No | |
| Burbankite # | 1.615 | 1.627 | U | .0120 | Yes | |
| Honessite | 1.615 | 1.635 | U | .0200 | No | |
| Mitscherlichite # | 1.615 ε | 1.637 ω | U- | .0220 | No | |
| Elbaite ! | 1.615 to 1.632 ε | 1.635 to 1.65 ω | U- | .0200 | Yes | none |
| Eylettersite | 1.615 to 1.66 ε | ω | U- | No | ||
| Carbonate-fluorapatite ? | 1.6155 ε | 1.6785 ω | U- | .0630 | No | |
| Feklichevite ! | 1.616 ε | 1.62 ω | U- | .0040 | Yes | |
| Metakirchheimerite # | 1.617 ε | 1.644 ω | U- | .0270 | No | |
| Crandallite # | 1.618 ω | 1.623 ε | U+ | .0050 | No | |
| Gorceixite # | 1.618 ω | 1.625 ε | U+ | .0070 | No | |
| Alluaivite | 1.618 ω | 1.626 ε | U+ | .0080 | No | |
| Golyshevite ! | 1.618 ε | 1.628 ω | U- | .0100 | Yes | |
| Gainesite | 1.618 ω | 1.63 ε | U+ | .0120 | No | |
| Ferrokentbrooksite ! | 1.6186 ε | 1.6221 ω | U- | .0035 | Yes | |
| Gillespite # | 1.619 ε | 1.621 ω | U- | .0020 | Yes | |
| Calciohilairite | 1.619 ε | 1.622 ω | U- | .0030 | No | |
| Olgite ? | 1.619 ε | 1.623 ω | U- | .0040 | No | |
| Stoppaniite ! | 1.619 ε | 1.625 ω | U- | .0060 | Yes | |
| Merrillite | 1.62 ε | 1.623 ω | U- | .0030 | No | |
| Merrillite-(Y) * | 1.62 ε | 1.623 ω | U- | .0030 | No | |
| Merrillite-(Ca) * | 1.62 ε | 1.623 ω | U- | .0030 | No | |
| Goyazite # | 1.62 ω | 1.63 ε | U+ | .0100 | Yes | none |
| Novacekite # | 1.62 to 1.625 ε | 1.62 to 1.641 ω | U- | .0000 | Yes | |
| Liddicoatite ! | 1.621 ε | 1.637 ω | U- | .0160 | Yes | |
| Stornesite-(Y) ! | 1.6215 ω | 1.625 ε | U+ | .0035 | No | |
| Scacchite # | 1.622 ε | 1.708 ω | U- | .0860 | No | |
| Kentbrooksite ! | 1.623 ε | 1.628 ω | U- | .0050 | Yes | |
| Bario-olgite ! | 1.623 ε | 1.628 ω | U- | .0050 | Yes | |
| Zn-Schulenbergite ! | 1.623 ε | 1.64 ω | U- | .0170 | Yes | |
| Schulenbergite | 1.623 ε | 1.64 ω | U- | .0170 | Yes | |
| Zussmanite | 1.623 ε | 1.643 ω | U- | .0200 | Yes | |
| Metatorbernite # | 1.624 ω | 1.626 ε | U+ | .0020 | No | |
| Selwynite | 1.624 ω | 1.636 ε | U+ | .0120 | Yes | |
| Rossmanite ! | 1.624 ε | 1.645 ω | U- | .0210 | Yes | |
| Hydroxyuvite ! | 1.624 ε | 1.646 ω | U- | .0220 | No | |
| Magnesiofoitite ! | 1.624 ε | 1.65 ω | U- | .0260 | Yes | |
| Alumoakermanite ! | 1.624 to 1.626 ε | 1.635 ω | U- | .0110 | Yes | |
| Wadeite # | 1.624 to 1.627 ω | 1.653 to 1.658 ε | U+ | .0290 to .0310 | No | |
| Arsenocrandallite | 1.625 | 1.625 | U | .0000 | No | |
| Smithsonite # | 1.625 ε | 1.85 ω | U- | .2250 | Yes | none |
| Kazakovite | 1.625 to 1.638 ε | 1.648 to 1.65 ω | U- | .0230 | No | |
| Khomyakovite ! | 1.6254 ε | 1.6279 ω | U- | .0025 | Yes | |
| Manganokhomyakovite ! | 1.626 ε | 1.629 ω | U- | .0030 | No | |
| Whitlockite # | 1.626 ε | 1.629 ω | U- | .0030 | No | |
| Metazeunerite # | 1.626 ε | 1.65 ω | U- | .0240 | Yes | |
| Melilite # | 1.626 to 1.658 ε | 1.632 to 1.669 ω | U- | .0060 to .0110 | Yes | none |
| Bobtraillite ! | 1.627 ω | 1.645 ε | U+ | .0180 | No | |
| Kamphaugite-(Y) | 1.627 ε | 1.663 ω | U- | .0360 | No | |
| Sweetite | 1.628 ε | 1.635 ω | U- | .0070 | No | |
| Kamaishilite | 1.629 ε | 1.629 ω | U- | .0000 | No | |
| Babefphite | 1.629 ω | 1.632 ε | U+ | .0030 | No | |
| Ashoverite | 1.629 ω | 1.639 ε | U+ | .0100 | No | |
| Apatite-(CaF) # | 1.63 ε | 1.6325 ω | U- | .0025 | Yes | none |
| Apatite * | 1.63 ε | 1.633 ω | U- | .0030 | No | none |
| Burtite | 1.63 ε-ω | 1.633 ε-ω | U-+ | .0030 | No |