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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 |
Hydrocerussite # | 1.94 ε | 2.09 ω | U- | .1500 | No | |
Baotite | 1.94 ω | 2.16 ε | U+ | .2200 | Yes | |
Beudantite # | 1.943 ε | 1.957 ω | U- | .0140 | Yes | none |
Hedyphane # | 1.948 to 2.01 ε-ω | 1.958 to 2.03 ε-ω | U-+ | .0100 to .0200 | Yes | none |
Feitknechtite | 1.95 ε | 2.055 ω | U- | .1050 | No | |
Geikielite # | 1.95 to 1.98 ε | 2.31 to 2.35 ω | U- | .3600 to .3700 | Yes | |
Ordonezite # | ω | 1.95 ε | U+ | No | ||
Dilithium * | 1.952 to 1.984 ω | 1.971 to 2.01 ε | U+ | .0190 to .0260 | No | |
Segnitite | 1.955 ε | 1.975 ω | U- | .0200 | No | |
Dugganite | 1.967 ε | 1.977 ω | U- | .0100 | No | |
Ernienickelite | 1.97 ε | 2 ω | U- | .0300 | No | |
Jagoite # | 1.97 ε | 2 ω | U- | .0300 | No | |
Calomel # | 1.97 ω | 2.65 ε | U+ | .6800 | Yes | |
Graulichite-(Ce) ! | ε | 1.97 ω | U- | Yes | ||
Powellite # | 1.974 ω | 1.984 ε | U+ | .0100 | Yes | none |
Ottensite ! | 1.99 | 1.99 | U | .0000 | Yes | Calculated |
Armangite # | 1.99 ε | 2.01 ω | U- | .0200 | No | |
Ekatite ! | 1.99 ω | 2.08 ε | U+ | .0900 | Yes | |
Cassiterite # | 1.99 to 2.01 ω | 2.093 to 2.1 ε | U+ | .1030 | Yes | none |
Mattheddleite | 1.999 ε | 2.017 ω | U- | .0180 | No | |
Grechishchevite | 2 ω | 2 ε | U+ | .0000 | Yes | |
Dreyerite | 2 ω | 2 ε | U+ | .0000 | Yes | |
Pseudoboleite # | 2 ε | 2.03 ω | U- | .0300 | No | |
Wakefieldite-(Y) | 2 ω | 2.14 ε | U+ | .1400 | No | |
Stenhuggarite | 2 | U | No | low birefringence | ||
Wakefieldite-(Ce) | 2 | U | No | |||
Argutite | 2.01 ω | 2.01 ε | U+ | .0000 | No | |
Zincite # | 2.013 ω | 2.029 ε | U+ | .0160 | Yes | none |
Barysilite # | 2.015 ε | 2.033 ω | U- | .0180 | No | |
Nierite | 2.02 ε | 2.03 ω | U- | .0100 | No | |
Simpsonite # | 2.025 ε | 2.045 ω | U- | .0200 | Yes | |
Matlockite # | 2.04 ε | 2.15 ω | U- | .1100 | Yes | none |
Pyromorphite # | 2.049 ε | 2.059 ω | U- | .0100 | No | none |
Cuzticite | 2.05 ε | 2.06 ω | U- | .0100 | Yes | |
Yedlinite | 2.059 ε | 2.125 ω | U- | .0660 | No | |
Abhurite | 2.06 ω | 2.11 ε | U+ | .0500 | Yes | |
Pittongite ! | ε | 2.085 ω | U- | No | ||
Cuprotungstite # | 2.1 ε | 2.18 ω | U- | .0800 | Yes | |
Hydrohetaerolite # | 2.1 ε | 2.26 ω | U- | .1600 | No | |
Iltisite ! | 2.1 ε | 2.3 ω | U- | .2000 | Yes | |
Schuetteite | 2.1 ε | ω | U- | Yes | ||
Priderite # | ε | 2.1 ω | U- | Yes | ||
Phosgenite # | 2.114 ω | 2.14 ε | U+ | .0260 | Yes | none |
Parakhinite | 2.12 ε | 2.155 ω | U- | .0350 | No | strong |
Hiarneite ! | 2.12 ω | 2.16 ε | U+ | .0400 | Yes | |
Santanaite | 2.12 ε | 2.32 ω | U- | .2000 | No | |
Melanostibite # | 2.12 | U | No | |||
Mimetite # | 2.129 ε | 2.144 ω | U- | .0150 | No | none |
Sphaerobismoite | 2.13 ω | 2.18 ε | U+ | .0500 | Yes | |
Penfieldite # | 2.13 ω | 2.21 ε | U+ | .0800 | No | |
Hetaerolite # | 2.14 ε | 2.34 ω | U- | .2000 | No | |
Hausmannite # | 2.15 ε | 2.46 ω | U- | .3100 | Yes | |
Squawcreekite ? | 2.18 ω | 2.28 ε | U+ | .1000 | Yes | r > v weak |
Mackayite # | 2.19 ω | 2.21 ε | U+ | .0200 | Yes | |
Kleinite # | 2.19 ω | 2.21 ε | U+ | .0200 | Yes | strong, r < v |
Stolzite # | 2.19 ε | 2.27 ω | U- | .0800 | Yes | |
Tripuhyite # | 2.19 ω | 2.33 ε | U+ | .1400 | No | |
Calzirtite | 2.19 to 2.27 ω | 2.3 to 2.36 ε | U+ | .1100 | No | |
Tetrarooseveltite | 2.2 ω | 2.2 ε | U+ | .0000 | No | |
Fergusonite-(Ce) * | 2.2 ε | 2.3 ω | U- | .1000 | No | |
Fergusonite-(Nd) * | 2.2 ε | 2.3 ω | U- | .1000 | No | |
Zavaritskite | 2.21 ε-ω | 2.213 ε-ω | U-+ | .0030 | No | |
Iodargyrite # | 2.21 ω | 2.22 ε | U+ | .0100 | No | |
Pyrophanite # | 2.21 ε | 2.48 ω | U- | .2700 | Yes | |
Ecdemite # | 2.25 ε | 2.32 ω | U- | .0700 | No | |
Plattnerite # | 2.25 ε | 2.35 ω | U- | .1000 | No | none |
Tapiolite-(Fe) # | 2.27 ω | 2.42 ε | U+ | .1500 | Yes | |
Finnemanite # | 2.2847 ε | 2.2949 ω | U- | .0102 | No | |
Pottsite | 2.3 ε | 2.4 ω | U- | .1000 | No | |
Chiluite | 2.3 ε | 2.4 ω | U- | .1000 | No | |
Tillmannsite ! | 2.3 ω | 2.5 ε | U+ | .2000 | Yes | |
Schiavinatoite ! | ω | 2.3 ε | U+ | No | ||
Wulfenite # | 2.304 ε | 2.402 ω | U- | .0980 | No | none |
Langbanite # | 2.31 ε | 2.36 ω | U- | .0500 | No | |
Asisite | 2.32 ε | 2.39 ω | U- | .0700 | No | |
Dukeite ! | 2.33 | 2.37 | U | .0400 | No | Calculated |
Lorettoite ? | 2.33 ε | 2.4 ω | U- | .0700 | No | |
Vanadinite # | 2.35 ε | 2.416 ω | U- | .0660 | Yes | |
Wurtzite # | 2.356 ω | 2.378 ε | U+ | .0220 | Yes | |
Landauite | 2.373 ε | 2.388 ω | U- | .0150 | Yes | |
Trechmannite # | 2.4 ε | 2.6 ω | U- | .2000 | Yes | |
Minium # | 2.4 | U | Yes | |||
Lonsdaleite | 2.404 ε-ω | 2.404 ε-ω | U-+ | .0000 | No | |
Parkinsonite | 2.42 ε | 2.58 ω | U- | .1600 | Yes | anomalously biaxial |
Changbaiite | 2.476 ω | 2.485 ε | U+ | .0090 | No | |
Anatase # | 2.488 ε | 2.561 ω | U- | .0730 | Yes | |
Chrombismite ! | 2.5 ω | 2.55 ε | U+ | .0500 | No | |
Senaite # | 2.5 ε | ω | U- | No | ||
Greenockite # | 2.506 ε-ω | 2.529 ε-ω | U-+ | .0230 | Yes | |
Litharge # | 2.535 ε | 2.665 ω | U- | .1300 | No | |
Rutile # | 2.605 to 2.621 ω | 2.899 to 2.908 ε | U+ | .2940 | Yes | strong |
Hypercinnabar | 2.61 ω | 2.85 ε | U+ | .2400 | No | |
Rambergite ! | 2.62 to 2.77 ε-ω | 2.62 to 2.77 ε-ω | U-+ | .0000 | No | |
Moissanite # | 2.654 ω | 2.967 ε | U+ | .3130 | Yes | |
Chalcophanite # | 2.72 ε | 2.73 ω | U- | .0100 | Yes | |
Proustite # | 2.792 ε | 3.087 to 3.088 ω | U- | .2950 to .2960 | Yes | |
Hematite # | 2.87 to 2.94 ε | 3.15 to 3.22 ω | U- | .2800 | Yes | very strong |
Pyrargyrite # | 2.881 ε | 3.084 ω | U- | .2030 | Yes | |
Cinnabar # | 2.905 ω | 3.256 ε | U+ | .3510 | Yes |