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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 |
| Mineevite-(Y) | 1.51 ε | 1.536 ω | U- | .0260 | No | |
| Brugnatellite # | 1.51 ε | 1.54 ω | U- | .0300 | No | |
| Ankerite # | 1.51 to 1.55 ε | 1.69 to 1.75 ω | U- | .1800 to .2000 | No | none |
| Mellite # | 1.511 ε | 1.539 ω | U- | .0280 | Yes | none |
| Leifite # | 1.5117 ω | 1.5224 ε | U+ | .0107 | No | |
| Tachyhydrite # | 1.512 ε | 1.52 ω | U- | .0080 | No | |
| Zemkorite | 1.513 ε | 1.535 ω | U- | .0220 | No | |
| Zincaluminite # | 1.514 ε | 1.534 ω | U- | .0200 | No | |
| Basaluminite ? | 1.515 to 1.519 ω | 1.515 to 1.519 ε | U+ | .0000 | No | |
| Felsobanyaite # | 1.516 ω | 1.533 ε | U+ | .0170 | No | |
| Stichtite # | 1.516 ω | 1.542 ε | U+ | .0260 | Yes | |
| Carletonite | 1.517 ε | 1.521 ω | U- | .0040 | Yes | |
| Davyne # | 1.517 to 1.522 ω | 1.518 to 1.527 ε | U+ | .0010 to .0050 | No | |
| Ammonioleucite | 1.518 ω | 1.518 ε | U+ | .0000 | No | |
| Norsethite | 1.519 ε | 1.694 ω | U- | .1750 | No | |
| Andersonite # | 1.52 ω | 1.54 ε | U+ | .0200 | No | |
| Koenenite # | 1.52 ω | 1.55 ε | U+ | .0300 | No | |
| Virgilite | ε | 1.52 ω | U- | No | ||
| Microsommite # | 1.521 ω | 1.529 ε | U+ | .0080 | No | |
| Zirklerite # | 1.522 ω | 1.552 ε | U+ | .0300 | No | |
| Scapolite * | 1.522 to 1.571 ε | 1.534 to 1.607 ω | U- | .0120 to .0360 | Yes | none |
| Afghanite | 1.523 ω | 1.529 ε | U+ | .0060 | No | |
| Buryatite ! | 1.523 ω | 1.532 ε | U+ | .0090 | No | |
| Weddellite # | 1.523 ω | 1.544 ε | U+ | .0210 | No | |
| Berlinite # | 1.5235 ω | 1.529 ε | U+ | .0055 | No | |
| Kalborsite | 1.525 ω | 1.525 ε | U+ | .0000 | No | |
| Kaliophilite # | 1.527 ε | 1.532 ω | U- | .0050 | No | |
| Roggianite | 1.527 ω | 1.535 ε | U+ | .0080 | No | |
| Eucryptite # | 1.527 ω | 1.586 ε | U+ | .0590 | No | |
| Olekminskite | 1.527 ε | 1.67 ω | U- | .1430 | No | |
| Paralstonite | 1.527 ε | 1.672 ω | U- | .1450 | No | |
| Benstonite | 1.527 ε | 1.69 ω | U- | .1630 | Yes | |
| Liottite | 1.528 ε | 1.53 ω | U- | .0020 | No | |
| Tounkite | 1.528 ω | 1.543 ε | U+ | .0150 | Yes | |
| Nepheline # | 1.528 to 1.544 ε | 1.531 to 1.549 ω | U- | .0030 to .0050 | Yes | none |
| Quadridavyne | 1.529 ω | 1.532 ε | U+ | .0030 | No | |
| Barbertonite # | 1.529 ε | 1.557 ω | U- | .0280 | No | |
| Milarite # | 1.529 to 1.548 ε | 1.532 to 1.551 ω | U- | .0030 | Yes | |
| Truscottite # | 1.53 ε | 1.552 ω | U- | .0220 | No | |
| Apophyllite-(KF) | 1.53 to 1.536 ω | 1.532 to 1.538 ε | U+ | .0020 | No | |
| Megakalsilite ! | 1.531 ε | 1.538 ω | U- | .0070 | No | |
| Telyushenkoite ! | 1.531 ω | 1.562 ε | U+ | .0310 | Yes | |
| Hydroxylborite ! | 1.531 ε | 1.566 ω | U- | .0350 | No | |
| Caminite | 1.532 ε | 1.534 ω | U- | .0020 | No | |
| Fibroferrite # | 1.532 ω | 1.57 ε | U+ | .0380 | No | |
| Indialite # | 1.532 to 1.535 ε | 1.537 to 1.539 ω | U- | .0050 | Yes | |
| Kalsilite # | 1.532 to 1.537 ε | 1.538 to 1.543 ω | U- | .0060 | No | |
| Zincowoodwardite ! | 1.532 to 1.558 | U | No | |||
| Quintinite-2H | 1.533 ω | 1.533 ε | U+ | .0000 | Yes | |
| Quintinite-3T | 1.533 ε-ω | 1.533 ε-ω | U-+ | .0000 | No | |
| Iowaite | 1.533 to 1.543 ε | 1.543 to 1.561 ω | U- | .0100 to .0180 | No | |
| Karchevskyite ! | 1.534 ε | 1.542 ω | U- | .0080 | Yes | |
| Fluoborite # | 1.534 ε | 1.57 ω | U- | .0360 | No | |
| Stratlingite | ε | 1.534 ω | U- | No | ||
| Apophyllite * | 1.535 ω | 1.537 ε | U+ | .0020 | Yes | none |
| Panunzite | 1.535 ε | 1.54 ω | U- | .0050 | No | |
| Woodallite ! | 1.535 ε | 1.555 ω | U- | .0200 | Yes | |
| Zakharovite | 1.535 ε | 1.565 ω | U- | .0300 | No | |
| Kutnohorite # | 1.535 ε | 1.727 ω | U- | .1920 | No | |
| Yagiite | 1.536 ω | 1.544 ε | U+ | .0080 | No | |
| Ashcroftine-(Ce) * | 1.536 ω | 1.545 ε | U+ | .0090 | No | |
| Ashcroftine-(Y) # | 1.536 to 1.537 ω | 1.545 to 1.549 ε | U+ | .0090 to .0120 | No | |
| Marialite # | 1.537 ε | 1.539 ω | U- | .0020 | Yes | |
| Roedderite | 1.537 ω | 1.542 ε | U+ | .0050 | No | |
| Reederite-(Y) ! | 1.537 ε | 1.548 ω | U- | .0110 | Yes | |
| Arsenuranospathite | 1.538 ε | 1.542 ω | U- | .0040 | No | |
| Sheldrickite ! | 1.538 ω | 1.563 ε | U+ | .0250 | No | |
| Gordaite ! | 1.5382 ε | 1.5607 ω | U- | .0225 | Yes | |
| Sinjarite | 1.54 | 1.54 | U | .0000 | No | |
| Jouravskite | 1.54 ε | 1.556 ω | U- | .0160 | Yes | |
| Carrboydite | 1.54 ε | 1.56 ω | U- | .0200 | No | |
| Chlormagaluminite | 1.54 ω | 1.56 ε | U+ | .0200 | No | |
| Osumilite-(Mg) | 1.5406 ω | 1.543 ε | U+ | .0024 | No | |
| Apophyllite-(KOH) | 1.542 ω | 1.543 ε | U+ | .0010 | No | |
| Theresemagnanite | 1.542 ε | 1.568 ω | U- | .0260 | No | |
| Lukechangite-(Ce) ! | 1.542 ε | 1.728 ω | U- | .1860 | Yes | |
| Pyroaurite # | 1.543 ε | 1.564 ω | U- | .0210 | No | |
| Eifelite | 1.543 to 1.5445 ω | 1.5443 to 1.5458 ε | U+ | .0013 | No | |
| Quartz # | 1.543 to 1.545 ω | 1.552 to 1.554 ε | U+ | .0090 | Yes | none |
| Guarinoite | 1.544 ε | 1.584 ω | U- | .0400 | Yes | |
| Monohydrocalcite | 1.545 ω | 1.59 ε | U+ | .0450 | Yes | |
| Osumilite-(Fe) # | 1.545 to 1.547 ω | 1.549 to 1.551 ε | U+ | .0040 | Yes | |
| Shigaite | ε | 1.546 ω | U- | Yes | ||
| Desautelsite | 1.547 ε | 1.569 ω | U- | .0220 | Yes | |
| Portlandite # | 1.547 ε | 1.574 ω | U- | .0270 | No | |
| Charmarite-2H | 1.547 ε | 1.587 ω | U- | .0400 | No | |
| Charmarite-3T | 1.547 ε | 1.587 ω | U- | .0400 | No | |
| Lovozerite # | 1.549 ε | 1.561 ω | U- | .0120 | No | |
| Hydrowoodwardite ! | 1.549 ω | 1.565 ε | U+ | .0160 | No | |
| Kalistrontite | 1.549 ε | 1.569 ω | U- | .0200 | No | |
| Paracoquimbite # | 1.55 ω | 1.555 ε | U+ | .0050 | No | |
| Coquimbite # | 1.55 ω | 1.557 ε | U+ | .0070 | Yes | none |
| Bassanite # | 1.55 ω | 1.57 ε | U+ | .0200 | No | |
| Sjogrenite # | 1.55 ε | 1.573 ω | U- | .0230 | No | |
| Vaterite # | 1.55 ω | 1.65 ε | U+ | .1000 | No | |
| Minrecordite | 1.55 ε | 1.75 ω | U- | .2000 | No | |
| Meionite # | 1.55 to 1.56 ε | 1.58 to 1.6 ω | U- | .0300 to .0400 | No | |
| Tiptopite | 1.551 ω | 1.559 ε | U+ | .0080 | No | |
| Friedrichbeckeite ! | 1.552 ω | 1.561 ε | U+ | .0090 | Yes | |
| Chalcophyllite # | 1.552 to 1.575 ε | 1.618 to 1.632 ω | U- | .0660 | No | none |