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Biaxial Minerals sorted by Index of Refraction |
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Biaxial 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 | α | β | γ | Sign | 2V | Bire | Pleo- chroic |
Dispersion |
| Haigerachite ! | 1.557 | 1.598 | 1.602 | B- | 32 | .0450 | Yes | |
| Cuprocopiapite # | 1.558 | 1.575 | 1.62 | B+ | 63 | .0620 | No | |
| Xiangjiangite | 1.558 | 1.576 | 1.593 | B- | 87 | .0350 | Yes | |
| Weloganite | 1.558 | 1.646 | 1.648 | B- | ~15 | .0900 | No | |
| 1.558 | 1.56 | B | .0020 | No | ||||
| Dickite # | 1.558 to 1.562 | 1.56 to 1.565 | 1.563 to 1.571 | B+ | 52-80 | .0050 to .0090 | Yes | none |
| Mcnearite | 1.559 | 1.562 | 1.572 | B+ | 60 | .0130 | No | |
| Saleeite # | 1.559 | 1.57 | 1.574 | B- | 61 | .0150 | Yes | r > v strong |
| Phuralumite | 1.559 | 1.616 | 1.624 | B- | 40 | .0650 | No | |
| Hohmannite # | 1.559 | 1.643 | 1.655 | B- | 40 | .0960 | No | |
| Callaghanite # | 1.559 | 1.653 | 1.68 | B- | 55 | .1210 | No | |
| Stevensite # | 1.56 | 1.56 | 1.57 | B+ | .0100 | No | ||
| Schoderite | 1.56 | 1.563 | 1.565 | B- | 43 | .0050 | No | |
| Fransoletite | 1.56 | 1.566 | 1.586 | B+ | 25 | .0260 | No | |
| Gorgeyite # | 1.56 | 1.569 | 1.584 | B+ | 79 | .0240 | No | |
| Switzerite | 1.56 | 1.574 | 1.58 | B- | 70 | .0200 | No | |
| Uranospinite # | 1.56 | 1.582 | 1.587 | B- | 0-5 | .0270 | Yes | r > v moderate |
| Preiswerkite | 1.56 | 1.614 | 1.615 | B- | 5-7 | .0550 | No | |
| Gilalite | 1.56 | 1.635 | 1.635 | B- | .0750 | No | ||
| Elpidite # | 1.56 | 1.65 | 1.674 | B+ | 76-89 | .1140 | Yes | |
| Lisetite | 1.56 | 1.57 | B | .0100 | No | |||
| Haiweeite | 1.56 to 1.571 | 1.575 to 1.58 | 1.578 to 1.582 | B- | 15 | .0180 | No | r > v strong |
| Donbassite # | 1.56 to 1.578 | 1.566 to 1.582 | 1.572 to 1.596 | B+ | 48-55 | .0120 to .0180 | No | r > v |
| Corrensite # | 1.56 to 1.585 | 1.582 to 1.612 | 1.582 to 1.612 | B- | 0-10 | .0220 to .0270 | Yes | |
| Hydrobiotite # | 1.56 to 1.562 | 1.565 to 1.567 | B- | 10 | Yes | |||
| Lisitsynite ! | 1.561 | 1.563 | 1.564 | B- | 51 | .0030 | No | strong, r > v |
| Sekaninaite | 1.561 | 1.572 | 1.576 | B- | 66 | .0150 | No | |
| Parafransoletite | 1.562 | 1.564 | 1.588 | B+ | 33 | .0260 | No | |
| Senegalite | 1.562 | 1.566 | 1.587 | B+ | 53 | .0250 | No | r > v weak |
| Ferrarisite | 1.562 | 1.572 | 1.585 | B+ | 83 | .0230 | No | |
| Uramarsite ! | 1.562 | 1.593 | 1.593 | B- | < 5 | .0310 | No | no dispersion |
| Szmikite # | 1.562 | 1.595 | 1.632 | B+ | 90 | .0700 | No | |
| Stronalsite | 1.563 | 1.564 | 1.574 | B+ | 32 | .0110 | No | |
| Norbergite # | 1.563 | 1.567 | 1.59 | B+ | 49.5 | .0270 | No | |
| Armstrongite | 1.563 | 1.569 | 1.573 | B- | .0100 | Yes | weak, r < v | |
| Hornesite # | 1.563 | 1.571 | 1.596 | B+ | 60 | .0330 | No | |
| Frolovite # | 1.563 | 1.572 | 1.586 | B | 70 | .0230 | No | |
| Maricopaite | 1.563 | 1.582 | 1.592 | B- | 70 | .0290 | No | r > v strong |
| Sigloite | 1.563 | 1.586 | 1.619 | B+ | 76 | .0560 | No | r < v |
| Variscite # | 1.563 | 1.588 | 1.594 | B- | moderate | .0310 | Yes | r < v weak |
| Znucalite | 1.563 | 1.621 | 1.621 | B- | 50-66 | .0580 | No | |
| 1.563 to 1.572 | 1.568 to 1.5784 | 1.573 to 1.583 | B-+ | 86 | .0100 to .0110 | Yes | ||
| Sabugalite # | 1.564 | 1.581 | 1.582 | B- | 0-15 | .0180 | Yes | |
| Uramphite # | 1.564 | 1.585 | 1.585 | B- | 0-3 | .0210 | No | |
| Mantienneite | 1.564 | 1.598 | B- | 50-60 | .0340 | No | ||
| Paragonite # | 1.564 to 1.58 | 1.594 to 1.609 | 1.6 to 1.609 | B- | 0-40 | .0360 | No | |
| Pecoraite | 1.565 | 1.565 to 1.603 | 1.565 to 1.603 | B-+ | 0 | .0000 to .0380 | No | |
| Isoclasite # | 1.565 | 1.568 | 1.58 | B+ | medium | .0150 | No | |
| Novgorodovaite ! | 1.565 | 1.645 | 1.725 | B- | 88 | .1600 | No | |
| 1.565 to 1.625 | 1.605 to 1.675 | 1.605 to 1.675 | B- | 0-25 | .0400 to .0500 | Yes | r > v or r < v | |
| Zinnwaldite # | 1.565 to 1.625 | 1.605 to 1.675 | 1.605 to 1.675 | B- | 30 | .0400 to .0500 | Yes | none |
| Angastonite ! | 1.566 | 1.572 | 1.584 | B+ | 70 | .0180 | No | dispersion not observed |
| Eggletonite | 1.566 | 1.606 | 1.606 | B- | 9 | .0400 | No | |
| Kastningite ! | 1.5665 | 1.574 | 1.5815 | B- | 94.7 | .0150 | No | |
| Denisovite | 1.567 | 1.568 | 1.576 | B+ | .0090 | No | ||
| Phosinaite-(Ce) ! | 1.567 | 1.569 | 1.57 | B- | 68 | .0030 | No | |
| Panethite | 1.567 | 1.576 | 1.579 | B- | 51 | .0120 | No | |
| Agrellite | 1.567 | 1.579 | 1.581 | B- | 47 | .0140 | Yes | |
| Tatarskite | 1.567 | 1.654 | 1.722 | B- | 83 | .1550 | No | |
| 1.567 | 1.588 | B- | .0210 | No | ||||
| Overite # | 1.568 | 1.574 | 1.58 | B- | 75 | .0120 | No | |
| Laplandite-(Ce) | 1.568 | 1.584 | 1.585 | B- | 28 | .0170 | No | |
| Thadeuite | 1.568 | 1.597 | 1.6 | B- | 33 | .0320 | No | |
| Gibbsite # | 1.568 to 1.57 | 1.568 to 1.57 | 1.586 to 1.587 | B+ | 0-5 | .0180 | Yes | r > v or r < v |
| Wagnerite # | 1.568 to 1.588 | 1.572 to 1.589 | 1.582 to 1.598 | B+ | 25-35 | .0140 | No | r < v weak |
| Glagolevite ! | 1.569 | 1.569 | 1.571 | B+ | 17 | .0020 | No | dispersion not observed |
| Ershovite | 1.569 | 1.574 | 1.59 | B+ | 58 | .0210 | Yes | medium, r > v |
| Lokkaite-(Y) | 1.569 | 1.592 | 1.62 | B | .0510 | No | ||
| Voggite | 1.569 | 1.594 | 1.622 | B+ | 81-88 | .0530 | No | |
| Calkinsite-(Ce) # | 1.569 | 1.657 | 1.686 | B- | 54 | .1170 | No | |
| Carbocernaite | 1.569 | 1.679 | 1.708 | B- | 52 | .1390 | No | |
| Chrysotile ! | 1.569 | 1.57 | B | 42 | .0010 | No | ||
| Anhydrite # | 1.569 to 1.573 | 1.574 to 1.579 | 1.609 to 1.618 | B+ | 36-45 | .0400 to .0450 | Yes | r < v |
| Banalsite # | 1.5695 | 1.571 | 1.5775 | B+ | 41 | .0080 | No | |
| Tobermorite # | 1.57 | 1.571 | 1.575 | B+ | 25 | .0050 | Yes | |
| Goldquarryite ! | 1.57 | 1.573 | 1.578 | B+ | ~30 | .0080 | Yes | r < v strong |
| Gunningite | 1.57 | 1.576 | 1.63 | B+ | .0600 | No | ||
| Torreyite # | 1.57 | 1.584 | 1.585 | B- | 40 | .0150 | No | |
| Tumchaite ! | 1.57 | 1.588 | 1.594 | B- | 60 | .0240 | Yes | |
| Englishite # | 1.57 | 1.572 | B- | 0-20 | .0020 | No | ||
| Tokkoite | 1.57 | 1.577 | B+ | 38 | .0070 | No | ||
| Uranosilite | 1.57 | 1.584 | B- | .0140 | No | |||
| Moolooite | 1.57 | 1.95 | B | .3800 | No | |||
| Slawsonite | 1.57 to 1.573 | 1.581 to 1.582 | 1.585 to 1.586 | B- | 55-82 | .0150 | No | r < v medium |
| 1.57 to 1.6 | 1.61 | 1.62 | B- | 81.5 | .0500 | No | ||
| Tengerite-(Y) # | 1.587 | 1.57 | 1.616 | B+ | 60-90 | .0290 | No | |
| Fritzscheite # | 1.57 to 1.58 | B- | 0-25 | No | ||||
| Bukovskyite | 1.57 to 1.582 | 1.626 to 1.631 | B+ | No | ||||
| Paracelsian # | 1.5702 | 1.5824 | 1.5869 | B- | 52.7 | .0167 | Yes | |
| Leucophanite # | 1.571 | 1.595 | 1.598 | B- | 40 | .0270 | Yes | |
| Ktenasite # | 1.571 | 1.613 | 1.623 | B- | 51 | .0520 | No | |
| Nefedovite | 1.571 | 1.59 | B+ | .0190 | No | |||
| Priceite # | 1.571 to 1.573 | 1.59 to 1.591 | 1.593 to 1.594 | B- | 32-44 | .0220 | No | r < v strong |
| Clinochlore # | 1.571 to 1.588 | 1.571 to 1.589 | 1.576 to 1.599 | B+ | 0-40 | .0050 to .0110 | Yes | r < v |
| Montgomeryite # | 1.572 | 1.578 | 1.582 | B- | 75 | .0100 | No | |
| Calcioferrite # | 1.572 | 1.579 | 1.583 | B- | 75 | .0110 | No | |
| Kornelite # | 1.572 | 1.586 | 1.64 | B+ | 49-62 | .0680 | No | very weak, r > v |
| Kolbeckite # | 1.572 | 1.59 | 1.601 | B- | 60 | .0290 | No | |
| Hopeite # | 1.572 to 1.574 | 1.582 to 1.591 | 1.59 to 1.592 | B- | 0-36 | .0180 | Yes | none |
| Anorthite # | 1.572 to 1.576 | 1.5785 to 1.5832 | 1.583 to 1.588 | B- | 78 | .0110 to .0120 | Yes | relatively weak |