Mineralogy Database

Biaxial Minerals sorted by Index of Refraction

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   2342 Optically Biaxial Minerals Between 0 RI and 4 RI

Color
Refractive Index
Hardness
Density
Cleavage
Other Properties

( 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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Mouse-over Mineral Name for IMA Status and Dispersion, Mouse-over Pleochroic for Optical Data Reference
Mineral Name α β γ Sign 2V Bire Pleo-
chroic
Dispersion
Barberiite  1.308 B-+ 90 No Calculated β index
Avogadrite # 1.3239 1.3245 1.3247 B- 75 .0008 No
Niter # 1.332 1.504 1.504 B- 7 .1720 No weak, r < v
Cryolite # 1.3385 to 1.339 1.3389 to 1.339 1.3396 to 1.34 B+ 43 .0011 Yes none
Sassolite # 1.34 1.456 1.459 B- 5 .1190 Yes none
Nitromagnesite # 1.34 1.506 1.506 B- 5 .1660 No
Weberite # 1.346 1.348 1.35 B+ 83 .0040 No
Qilianshanite  1.351 1.459 1.486 B- 50 .1350 No
Barentsite  1.358 1.479 1.53 B- 62 .1720 No r < v weak
Simmonsite ! 1.359 1.359 1.359 B 27 .0000 No
Neighborite  1.364 1.367 B .0030 No
Glushinskite  1.365 1.53 1.595 B- .2300 No
Nahcolite # 1.377 1.503 1.583 B- 75 .2060 Yes
Kalicinite # 1.38 1.482 1.578 B- 81.5 .1980 No
Darapskite # 1.388 1.479 1.486 B- 27 .0980 No
Mirabilite # 1.396 1.4103 1.419 B- 75.93 .0230 Yes none
Wheatleyite  1.4 1.499 1.667 B+ 83 .2670 No
Natron # 1.405 1.425 1.44 B- 71 .0350 Yes r > v
Thomsenolite # 1.4072 1.4136 1.415 B- 50 .0078 No
Natrite  1.41 1.535 1.543 B- 28 .1330 No
Pachnolite # 1.411 1.413 1.42 B+ 76 .0090 No
Carlhintzeite  1.411 1.416 1.422 B+ 77 .0110 No
Trona # 1.412 1.492 1.54 B- 72 .1280 No relatively strong
Nesquehonite # 1.412 1.501 1.526 B- 53 .1140 No
Yaroslavite  1.413 1.416 to 1.417 1.423 B- 74 .0100 No
Natroxalate ! 1.415 1.524 1.592 B- 72 .1770 No
Meridianiite ! 1.418 1.448 B .0300 No
Thermonatrite # 1.42 1.506 1.524 B- 48 .1040 No
Santite  1.422 1.435 1.48 B+ .0580 No
Teschemacherite # 1.4227 1.5358 1.5545 B- 41.633 .1318 No
Svyazhinite  1.423 1.439 1.444 B- small .0210 No
Karasugite  1.424 1.432 1.4415 B+ 94-94.5 .0175 No
Wilcoxite  1.424 1.436 1.438 B- 48 .0140 No not discernible
Lindbergite ! 1.424 1.55 1.65 B- 80 .2260 No r > v very weak
Calcjarlite  1.425 1.428 1.432 B+ 72 .0070 No
Hexahydrite # 1.426 1.453 1.456 B- 38 .0300 Yes none
Zabuyelite  1.4285 1.5672 1.5743 B- 25 .1458 No
Jarlite # 1.429 1.433 1.436 B-+ 90 .0070 No
Ameghinite  1.429 1.528 1.538 B- 33 .1090 Yes
Kalinite # 1.43 1.452 1.485 B- 52 .0550 Yes none
IMA2002-034 ! 1.43 1.454 1.47 B- ~70 .0400 No
Matteuccite # 1.43 1.46 1.48 B- 86 .0500 No
Sborgite # 1.431 1.438 1.507 B+ 35 .0760 No
Deliensite ! 1.432 1.47 1.492 B- 73 .0600 Yes weak, r > v
Bogvadite  1.433 1.436 1.4389 B- 87 .0059 No
Epsomite # 1.433 1.455 1.461 B- 52 .0280 Yes none
Wegscheiderite  1.433 1.519 1.528 B- 32.4 .0950 No
Wattevilleite # 1.435 1.455 1.459 B- 48 .0240 No dispersion not observed
Jorgensenite ! 1.436 1.442 1.442 B- 0-5 .0060 No
Oxammite # 1.438 1.547 1.595 B- 62 .1570 No
Kogarkoite  1.439 1.439 1.442 B+ near 0 .0030 Yes
Stercorite # 1.439 1.442 1.469 B+ 35.567 .0300 No
Lecontite # 1.44 1.454 1.455 B- 29.74 .0150 No
Khademite  1.44 1.46 1.487 B- 68 .0470 No
Usovite  1.441 1.442 1.444 B+ 70 .0030 Yes
Admontite  1.442 1.504 B- 30 .0620 Yes
Catalanoite ! 1.443 1.457 1.458 B- 29.6 .0150 Yes r > v strong
Gaylussite # 1.444 1.5155 1.523 B- 34 .0790 No relatively strong
Mercallite # 1.445 1.46 1.491 B+ 56 .0460 No
Hungchaoite  1.445 1.485 1.49 B- 15 .0450 No
Thermessaite ! 1.445 B No Calculated
Borax # 1.447 1.469 to 1.47 1.472 B- 39-40 .0250 Yes r > v distinct
Goslarite # 1.447 to 1.463 1.475 to 1.48 1.47 to 1.485 B- 46 .0230 Yes none
Gearksutite # 1.448 1.454 1.456 B- .0080 No
Burkeite # 1.448 1.489 1.493 B- 34 .0450 Yes r > v distinct
Ferrosaponite ! 1.448 1.641 1.642 B- 5 .1940 Yes Calculated &alpha; index
Chesnokovite ! 1.449 1.453 1.458 B+ 80 .0090 No
Mendozite # 1.449 1.461 1.463 B- 56 .0140 No
Acuminite  1.4507 1.4528 1.4624 to 1.4627 B+ 46-57 .0117 to .0120 No
Kanemite  1.451 1.47 1.478 B- 46 .0270 No
Tikhonenkovite  1.452 1.456 1.458 B- 70 .0060 No
Stenonite  1.452 1.527 1.538 B- 43 .0860 No
Kanonerovite ! 1.453 1.459 B- Yes 2V could not be measured
Bayleyite # 1.453 to 1.455 1.49 to 1.492 1.498 to 1.502 B- 30 .0450 to .0470 Yes
Dorfmanite  1.454 1.461 1.471 B+ 65 .0170 No very weak, r > v
Kernite # 1.454 1.472 1.488 B- 80 .0340 Yes r > v distinct
Zugshunstite-(Ce) ! 1.455 1.485 1.528 B+ 85 .0730 Yes medium, r > v
Hellyerite # 1.455 1.503 1.549 B- 85 .0940 No
Ikaite  1.455 1.538 1.545 B- 45 .0900 No distinct
Chessexite  1.456 1.46 1.48 B+ 47 .0240 No
Horvathite-(Y) ! 1.457 1.543 1.622 B- 82 .1650 Yes none
Chvaleticeite  1.457 1.506 B .0490 No
Barringtonite  1.458 1.473 1.501 B+ 73.7 .0430 No
Gwihabaite ! 1.458 1.527 1.599 B- 90 .1410 No none
Aluminite # 1.459 1.464 1.47 B+ 90 .0110 Yes none
Cattiite ! 1.459 1.47 1.47 B- 25 .0110 Yes
Jurbanite  1.459 1.473 1.483 B- 80 .0240 No
Megacyclite  1.46 1.478 1.481 B- 44 .0210 No r > v strong
Picromerite # 1.4607 1.4629 1.4755 B+ 47.9 .0148 No
Rostite  1.461 1.47 1.484 B+ .0230 No
Creedite # 1.461 1.478 1.485 B- 64.37 .0240 No
Alpersite ! 1.462 1.465 1.469 B+ 79.8 .0070 No r > v weak
Mallardite # 1.462 1.465 1.474 B+ 80-90 .0120 No
Boggildite # 1.462 1.466 1.469 B+ 78-80 .0070 No
Moraesite # 1.462 1.482 1.49 B- 65 .0280 No
Aubertite  1.462 1.482 1.495 B- 71 .0330 No
Konyaite  1.464 1.468 1.474 B+ 74 .0100 No
Lansfordite # 1.465 1.468 1.507 B+ 59.5 .0420 No
Sasaite  1.465 1.473 1.477 B- 15 .0120 No
Baylissite  1.465 1.485 1.535 B- 64 .0700 No