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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)
Pages: [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] [ 7 ] [ 8 ] Optical Help
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 |