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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 |
| Dashkovaite ! | 1.465 | 1.486 | 1.516 | B+ | .0510 | No | ||
| Bianchite # | 1.465 | 1.494 | 1.495 | B- | 10 | .0300 | No | |
| Nitrocalcite # | 1.465 | 1.498 | 1.504 | B- | 50 | .0390 | No | |
| Swartzite # | 1.465 | 1.51 | 1.54 | B- | 40 | .0750 | Yes | |
| Magnesioaubertite | 1.466 | 1.481 | 1.4875 | B- | 112-114 | .0215 | No | |
| Dawsonite # | 1.466 | 1.542 | 1.596 | B- | 77 | .1300 | Yes | relatively weak |
| Silhydrite | 1.466 | B | No | |||||
| Carnallite # | 1.467 | 1.4755 | 1.494 | B+ | 70 | .0270 | No | none |
| Morenosite # | 1.467 | 1.489 | 1.492 | B- | 42 | .0250 | Yes | r > v weak |
| Calclacite # | 1.468 | 1.484 | 1.515 | B+ | 80 | .0470 | No | |
| Ezcurrite # | 1.468 | 1.507 | 1.529 | B- | 73.5 | .0610 | No | |
| Ferrohexahydrite | 1.468 | 1.498 | B | .0300 | No | |||
| Meta-alunogen # | 1.469 | 1.473 | 1.491 | B+ | .0220 | No | ||
| Revdite | 1.469 | 1.482 | 1.49 | B- | 75 | .0210 | No | |
| Nickelhexahydrite | 1.469 to 1.47 | 1.493 to 1.494 | B | .0240 | No | |||
| Vashegyite # | 1.47 | 1.477 | 1.482 | B- | 74 | .0120 | No | |
| Boothite # | 1.47 | 1.48 | 1.49 | B- | 80 | .0200 | No | |
| Rivadavite | 1.47 | 1.481 | 1.497 | B+ | 80 | .0270 | No | |
| Ammonioborite # | 1.47 | 1.487 | 1.54 | B+ | 60 | .0700 | No | |
| Moorhouseite | 1.47 | 1.497 | 1.497 | B- | .0270 | No | ||
| Strontioborite | 1.47 | 1.51 | 1.579 | B-+ | 85 | .1090 | No | |
| Magadiite | 1.47 | B | No | |||||
| Melanterite # | 1.47 to 1.471 | 1.4765 to 1.4795 | 1.486 | B+ | 86 | .0160 | Yes | none |
| Thenardite # | 1.471 | 1.477 | 1.484 | B+ | 83 | .0130 | Yes | none |
| Dachiardite-Na | 1.471 to 1.48 | 1.475 to 1.481 | 1.476 to 1.485 | B- | 52-92 | .0050 | Yes | r < v moderate |
| Tridymite # | 1.471 to 1.482 | 1.472 to 1.483 | 1.474 to 1.488 | B+ | 36-90 | .0030 to .0060 | Yes | none |
| Boussingaultite # | 1.4716 | 1.473 | 1.4786 | B+ | 51.183 | .0070 | No | |
| Aksaite | 1.472 | 1.503 | 1.526 | B- | 80 | .0540 | No | |
| Rouvilleite | 1.472 | 1.562 | 1.569 | B- | 25-30 | .0970 | Yes | |
| Makatite | 1.472 to 1.475 | 1.48 | 1.487 to 1.49 | B+ | .0150 | No | ||
| Mordenite # | 1.472 to 1.483 | 1.475 to 1.485 | 1.477 to 1.487 | B-+ | 76-104 | .0050 | No | none |
| Alunogen # | 1.473 | 1.474 | 1.48 | B+ | 31-69 | .0070 | No | none |
| Para-alumohydrocalcite | 1.473 | 1.492 | 1.502 | B- | 69 | .0290 | Yes | |
| Ferrierite-Mg # | 1.473 to 1.489 | 1.474 to 1.489 | 1.477 to 1.492 | B-+ | 50-55 | .0040 | No | |
| Ferrierite-K ! | 1.473 to 1.489 | 1.474 to 1.489 | 1.477 to 1.492 | B-+ | 50-55 | .0040 | No | |
| Ferrierite-Na ! | 1.473 to 1.489 | 1.474 to 1.489 | 1.477 to 1.492 | B-+ | 50-55 | .0040 | No | |
| Natrolite # | 1.473 to 1.489 | 1.476 to 1.491 | 1.485 to 1.502 | B+ | 60-63 | .0120 to .0130 | Yes | weak, r < v |
| Fluellite # | 1.473 to 1.49 | 1.49 to 1.496 | 1.506 to 1.511 | B+ | 80 | .0330 | Yes | |
| Misenite # | 1.475 | 1.48 | 1.487 | B+ | 81 | .0120 | No | |
| Dietrichite # | 1.475 | 1.48 | 1.488 | B+ | 70 | .0130 | No | |
| 1.475 | 1.495 | 1.508 | B | 77 | .0330 | No | ||
| 1.4756 | 1.4775 | 1.4805 | B+ | .0049 | Yes | |||
| Terranovaite ! | 1.476 | 1.478 | 1.483 | B+ | 65 | .0070 | Yes | |
| Tveitite-(Y) | 1.476 | 1.479 | 1.481 | B- | 34 | .0050 | Yes | |
| Pickeringite # | 1.476 | 1.48 | 1.483 | B- | 60 | .0070 | No | none |
| Uklonskovite | 1.476 | 1.5 | B+ | .0240 | No | |||
| Clinoptilolite-Na ! | 1.476 to 1.491 | 1.479 to 1.493 | 1.479 to 1.497 | B-+ | 31-48 | .0030 to .0060 | Yes | r > v to r < v strong |
| Clinoptilolite-K # | 1.476 to 1.491 | 1.479 to 1.493 | 1.479 to 1.497 | B-+ | 31-48 | .0030 to .0060 | Yes | r > v to r < v strong |
| Clinoptilolite-Ca ! | 1.476 to 1.491 | 1.479 to 1.493 | 1.479 to 1.497 | B-+ | 31-48 | .0030 to .0060 | Yes | r > v to r < v strong |
| Heulandite-Na ! | 1.476 to 1.506 | 1.479 to 1.51 | 1.479 to 1.517 | B+ | 10-48 | .0030 to .0110 | Yes | r > v |
| Heulandite-Sr ! | 1.476 to 1.506 | 1.479 to 1.51 | 1.479 to 1.517 | B+ | 10-48 | .0030 to .0110 | Yes | r > v |
| Heulandite-K ! | 1.476 to 1.506 | 1.479 to 1.51 | 1.479 to 1.517 | B+ | 10-48 | .0030 to .0110 | Yes | r > v |
| Heulandite-Ca # | 1.476 to 1.506 | 1.479 to 1.51 | 1.479 to 1.517 | B+ | 10-48 | .0030 to .0110 | Yes | r > v |
| Bieberite # | 1.477 | 1.483 | 1.489 | B- | 88 | .0120 | No | |
| Phosphorrosslerite # | 1.477 | 1.485 | 1.486 | B- | 38.33 | .0090 | No | |
| Wupatkiite | 1.477 | 1.484 | B | .0070 | Yes | weak | ||
| Zincmelanterite # | 1.477 to 1.479 | 1.483 to 1.487 | 1.488 to 1.489 | B+ | 79-80 | .0110 | No | |
| Apjohnite # | 1.478 | 1.482 | 1.482 | B- | 0-15 | .0040 | Yes | none |
| Chabazite-Ca # | 1.478 to 1.485 | 1.48 to 1.4895 | 1.48 to 1.49 | B-+ | 0-32 | .0020 to .0050 | Yes | none |
| Chabazite-K ! | 1.478 to 1.485 | 1.48 to 1.4895 | 1.48 to 1.49 | B-+ | 0-32 | .0020 to .0050 | Yes | none |
| Chabazite-Na ! | 1.478 to 1.485 | 1.48 to 1.4895 | 1.48 to 1.49 | B-+ | 0-32 | .0020 to .0050 | Yes | none |
| Leonite # | 1.479 | 1.482 | 1.487 | B+ | 90 | .0080 | No | |
| Saponite # | 1.479 to 1.49 | 1.51 to 1.525 | 1.511 to 1.527 | B- | 0-10 | .0320 to .0370 | No | none |
| Stilbite-Na ! | 1.479 to 1.492 | 1.485 to 1.5 | 1.489 to 1.505 | B- | 22-79 | .0100 to .0130 | Yes | weak, r < v |
| Stilbite-Ca # | 1.479 to 1.492 | 1.485 to 1.5 | 1.489 to 1.505 | B- | 22-79 | .0100 to .0130 | Yes | weak, r < v |
| Analcime # | 1.479 to 1.493 | 1.48 to 1.494 | B | .0010 | Yes | none | ||
| Barrerite | 1.4791 | 1.4851 | 1.4891 | B- | 78 | .0100 | No | |
| Boggsite | 1.48 | 1.481 | 1.487 | B- | 25 | .0070 | No | |
| Gottardiite ! | 1.48 | 1.485 | 1.486 | B- | 40-48 | .0060 | No | |
| Halotrichite # | 1.48 | 1.486 | 1.49 | B- | 35 | .0100 | Yes | none |
| Levinsonite-(Y) ! | 1.48 | 1.49 | 1.55 | B+ | 7 | .0700 | Yes | none |
| Adamsite-(Y) ! | 1.48 | 1.498 | 1.571 | B+ | 53 | .0910 | Yes | |
| Kenyaite | 1.48 | B+ | small | No | ||||
| Mohrite | 1.48 to 1.486 | 1.486 to 1.497 | B+ | 75 | .0060 to .0110 | No | ||
| Pentahydrite # | 1.482 | 1.492 | 1.493 | B- | 45.13 | .0110 | No | |
| Inderborite # | 1.482 | 1.512 | 1.53 | B- | 77 | .0480 | No | |
| Direnzoite ! | 1.483 | 1.483 | 1.483 | B | .0000 | Yes | ||
| Blodite # | 1.483 | 1.486 | 1.487 | B- | 71 | .0040 | No | relatively strong |
| Caoxite ! | 1.483 | 1.516 | 1.533 | B- | 70 | .0500 | Yes | |
| Chalconatronite # | 1.483 | 1.53 | 1.576 | B+ | 70 | .0930 | Yes | |
| Perlialite | 1.483 | 1.488 | B | .0050 | No | |||
| Phillipsite-K ! | 1.483 to 1.505 | 1.484 to 1.511 | 1.486 to 1.514 | B-+ | 60-90 | .0030 to .0090 | No | r > v or r < v |
| Phillipsite-Na # | 1.483 to 1.505 | 1.484 to 1.511 | 1.486 to 1.514 | B-+ | 60-90 | .0030 to .0090 | No | r > v or r < v |
| Phillipsite-Ca ! | 1.483 to 1.505 | 1.484 to 1.511 | 1.486 to 1.514 | B-+ | 60-90 | .0030 to .0090 | No | r > v or r < v |
| Cyanochroite # | 1.4836 | 1.4864 | 1.502 | B+ | 46.533 | .0184 | No | |
| Tamarugite # | 1.484 | 1.486 | 1.497 | B+ | 60 | .0130 | No | |
| Aristarainite | 1.484 | 1.498 | 1.523 | B+ | 70 | .0390 | No | |
| Gowerite | 1.484 | 1.501 | 1.55 | B+ | 63 | .0660 | Yes | |
| Sanjuanite | 1.484 | 1.499 | B | .0150 | No | |||
| Kribergite # | 1.484 | B | No | |||||
| Stellerite # | 1.4848 | 1.4864 to 1.4964 | 1.4979 | B- | 47 | .0131 | No | |
| Mutinaite ! | 1.485 | 1.487 | 1.488 | B- | 70 | .0030 | Yes | 2V could not be measured |
| Canavesite | 1.485 | 1.494 | 1.505 | B+ | large | .0200 | No | |
| 1.485 | 1.565 | 1.572 | B- | .0870 | Yes | |||
| Alumohydrocalcite # | 1.485 to 1.502 | 1.553 to 1.562 | 1.57 to 1.585 | B- | 64 | .0850 | No | |
| Montmorillonite # | 1.485 to 1.535 | 1.504 to 1.55 | 1.505 to 1.55 | B- | 5-30 | .0200 | Yes | none |
| Vanthoffite # | 1.488 | 1.489 | 1.489 | B- | 84 | .0010 | No | r < v weak |
| Inderite # | 1.488 | 1.491 | 1.505 | B+ | 37 | .0170 | No | |
| Kurnakovite # | 1.488 | 1.508 | 1.515 | B- | 63 | .0270 | Yes | r > v |
| Hydroglauberite | 1.488 | 1.5 | B- | .0120 | No |