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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 |
| Calcioaravaipaite ! | 1.51 | 1.528 | 1.531 | B- | 36 | .0210 | Yes | r > v strong |
| Aerinite # | 1.51 | 1.56 | 1.58 | B- | 63 | .0700 | Yes | |
| Strontiodresserite | 1.51 | 1.583 | 1.595 | B- | 42.5 | .0850 | No | |
| Uralolite | 1.51 to 1.512 | 1.525 to 1.526 | 1.533 to 1.536 | B- | 66-80 | .0230 to .0240 | Yes | |
| Brewsterite-Ba ! | 1.51 to 1.514 | 1.512 to 1.516 | 1.523 to 1.528 | B+ | 44-45 | .0130 to .0140 | No | |
| Bobierrite # | 1.51 to 1.5468 | 1.52 to 1.5533 | 1.543 to 1.582 | B+ | 53-71 | .0330 to .0352 | No | |
| Peisleyite | 1.51 | B | No | |||||
| Ilesite # | 1.511 | 1.519 | 1.521 | B- | 60 | .0100 | No | |
| Sinkankasite | 1.511 | 1.529 | 1.544 | B- | 84 | .0330 | No | r < v |
| Nyerereite | 1.511 | 1.533 | 1.534 | B- | 29 | .0230 | No | |
| Vantasselite | 1.511 to 1.5111 | 1.56 | 1.578 | B- | 61 | .0670 | No | |
| Thomsonite-Ca # | 1.511 to 1.53 | 1.513 to 1.532 | 1.516 to 1.545 | B+ | 44-75 | .0050 to .0150 | Yes | distinct to strong, r > v |
| Strontioginorite | 1.512 | 1.524 | 1.577 | B+ | 53 | .0650 | No | |
| Okenite # | 1.512 to 1.532 | 1.514 to 1.535 | 1.515 to 1.542 | B- | 60 | .0030 to .0100 | Yes | none |
| Lovdarite | 1.513 | 1.516 | 1.518 | B+ | 90 | .0050 | No | |
| Nickelblodite | 1.513 | 1.518 | 1.52 | B- | 60-70 | .0070 | No | |
| 1.513 | 1.525 | 1.536 | B | .0230 | No | |||
| Minasragrite # | 1.513 | 1.536 | 1.545 | B- | .0320 | No | ||
| Siderotil # | 1.513 to 1.515 | 1.525 to 1.526 | 1.534 to 1.536 | B- | 50 | .0210 | No | |
| Gonnardite # | 1.514 | 1.515 | 1.52 | B+ | 52 | .0060 | Yes | |
| Newberyite # | 1.514 | 1.517 | 1.533 | B+ | 45 | .0190 | No | |
| Probertite # | 1.514 | 1.524 | 1.543 | B+ | 73 | .0290 | No | relatively weak |
| Zincsilite | 1.514 | 1.559 | 1.562 | B- | 0-22 | .0480 | No | |
| Kingite # | 1.514 | B | No | |||||
| Silinaite | 1.515 | 1.516 | 1.518 | B+ | 64-71 | .0030 | No | |
| Montroyalite | 1.515 | 1.53 | 1.545 | B- | 80-89 | .0300 | No | |
| Mbobomkulite | 1.515 | 1.585 | B | .0700 | No | |||
| Searlesite # | 1.515 to 1.524 | 1.531 to 1.533 | 1.535 | B- | 55-73 | .0200 | No | |
| Rapidcreekite | 1.516 | 1.518 | 1.531 | B+ | 45 | .0150 | No | |
| Walkerite ! | 1.516 | 1.532 | 1.554 | B+ | 82.2 | .0380 | Yes | dispersion not observed |
| Korshunovskite | 1.516 | 1.538 | 1.547 | B- | 62 | .0310 | No | |
| Chalcanthite # | 1.516 | 1.539 | 1.546 | B- | 56 | .0300 | No | none |
| Amarantite # | 1.516 | 1.598 | 1.621 | B- | 30 | .1050 | No | |
| Strontianite # | 1.516 to 1.52 | 1.664 to 1.667 | 1.666 to 1.668 | B- | 7 | .1500 | Yes | weak, r < v |
| Ginorite # | 1.517 | 1.524 | 1.577 | B+ | 42 | .0600 | No | |
| Orthoclase # | 1.518 | 1.522 | 1.523 to 1.524 | B- | 65-75 | .0050 to .0060 | Yes | relatively strong |
| Microcline # | 1.518 | 1.522 | 1.525 | B- | 77-84 | .0070 | Yes | relatively weak |
| Macdonaldite | 1.518 | 1.524 | 1.53 | B-+ | 90 | .0120 | No | |
| Dresserite | 1.518 | 1.601 | B- | 30-40 | .0830 | No | ||
| Sanidine # | 1.518 to 1.525 | 1.523 to 1.53 | 1.525 to 1.531 | B- | 60-0 | .0070 | Yes | r < v distinct |
| Tacharanite | 1.518 to 1.525 | 1.53 to 1.537 | B+ | .0120 | No | |||
| Tunellite | 1.519 | 1.534 | 1.569 | B+ | 68 | .0500 | Yes | |
| Rectorite # | 1.519 | 1.55 | 1.559 | B- | 5-20 | .0400 | No | r > v |
| 1.519 | 1.552 | 1.561 | B | .0420 | No | |||
| Hotsonite-VII | 1.519 | 1.521 | B | .0020 | No | |||
| Hotsonite-VI | 1.519 | 1.521 | B | .0020 | No | |||
| Gypsum # | 1.519 to 1.521 | 1.522 to 1.523 | 1.529 to 1.53 | B+ | 58 | .0100 | Yes | strong, r > v |
| Romerite # | 1.519 to 1.524 | 1.57 to 1.571 | 1.58 to 1.583 | B- | 45-51 | .0610 | Yes | r > v very strong |
| Anorthoclase # | 1.519 to 1.529 | 1.524 to 1.534 | 1.527 to 1.536 | B- | 34-60 | .0080 | Yes | r > v |
| Chalcoalumite # | 1.52 | 1.52 | 1.53 | B+ | 0-15 | .0100 | No | relatively strong |
| Weinebeneite | 1.52 | 1.52 | 1.53 | B+ | 5-8 | .0100 | No | |
| Sepiolite # | 1.52 | 1.5202 | 1.53 | B- | 20-70 | .0100 | No | none |
| Gaultite | 1.52 | 1.521 | 1.524 | B+ | 61.3 | .0040 | No | weak to moderate, r > v |
| Mascagnite # | 1.52 | 1.523 | 1.533 | B+ | 52.2 | .0130 | No | |
| Rubicline ! | 1.52 | 1.524 | 1.527 | B | .0070 | Yes | ||
| Yakovenchukite-(Y) ! | 1.52 | 1.525 | 1.538 | B+ | 60 | .0180 | Yes | |
| Earlandite # | 1.52 | 1.53 | 1.58 | B+ | 60 | .0600 | No | |
| Kieserite # | 1.52 | 1.533 | 1.584 | B+ | 55 | .0640 | No | |
| Crawfordite | 1.52 | 1.564 | 1.565 | B- | 20 | .0450 | Yes | not discernible |
| Bonshtedtite | 1.52 | 1.568 | 1.591 | B- | 68 | .0710 | No | |
| Lanthanite-(La) # | 1.52 | 1.587 | 1.613 | B- | 63 | .0930 | No | relatively weak |
| Chelkarite | 1.52 | 1.558 | B | .0380 | No | |||
| Luneburgite # | 1.52 to 1.522 | 1.54 to 1.541 | 1.545 to 1.548 | B- | 63 | .0250 to .0260 | No | |
| Hydroboracite # | 1.52 to 1.523 | 1.534 to 1.535 | 1.569 to 1.571 | B+ | 60-66 | .0490 | No | relatively weak |
| Wavellite # | 1.52 to 1.535 | 1.526 to 1.543 | 1.545 to 1.561 | B+ | 72 | .0250 to .0260 | Yes | none |
| Chlorocalcite # | 1.52 | B | No | |||||
| Spadaite # | 1.521 | 1.525 to 1.53 | 1.545 | B+ | .0240 | Yes | ||
| Sidorenkite | 1.521 | 1.563 | 1.585 | B- | 68 | .0640 | No | |
| Mundrabillaite | 1.521 to 1.522 | 1.542 to 1.544 | 1.551 to 1.552 | B- | 65 | .0300 | No | |
| Kvanefjeldite | 1.522 | 1.522 | 1.543 | B+ | 0-9 | .0210 | No | |
| Lalondeite ! | 1.522 | 1.528 | 1.529 | B- | 48 | .0070 | Yes | dispersion not observed |
| Botryogen # | 1.522 | 1.529 | 1.577 | B+ | 41 | .0550 | Yes | none |
| Fedorite | 1.522 | 1.53 | 1.531 | B- | 32 | .0090 | No | r < v distinct |
| Mcauslanite | 1.522 | 1.531 | 1.534 | B- | 55-59.7 | .0120 | No | |
| Boyleite | 1.522 | 1.531 | 1.536 | B- | 70 | .0140 | No | |
| Lishizhenite | 1.522 | 1.568 | 1.578 | B- | 47 | .0560 | No | |
| Tainiolite # | 1.522 to 1.54 | 1.553 to 1.57 | 1.553 to 1.57 | B- | 2-5 | .0310 | Yes | r > v or r < v |
| Kalifersite ! | 1.523 | 1.525 | 1.55 | B+ | 30 | .0270 | Yes | not discernible |
| Hydromagnesite # | 1.523 | 1.527 | 1.545 | B+ | 30-90 | .0220 | Yes | none |
| Volkovskite | 1.523 to 1.536 | 1.53 to 1.539 | 1.596 to 1.603 | B+ | 24-37 | .0730 | No | |
| 1.523 | B | No | ||||||
| Nacaphite | 1.524 | 1.528 | 1.536 | B- | 65 | .0120 | No | |
| Sazhinite-(La) ! | 1.524 | 1.528 | 1.544 | B+ | 46 | .0200 | No | |
| Koktaite # | 1.524 | 1.532 | 1.536 | B- | 72 | .0120 | No | |
| 1.524 | 1.531 | B | .0070 | No | ||||
| Sazhinite-(Ce) | 1.525 | 1.528 | 1.544 | B+ | 47 | .0190 | No | |
| Rosslerite # | 1.525 | 1.53 | 1.55 | B+ | .0250 | No | ||
| Brenkite | 1.525 | 1.59 | 1.593 | B- | 26-28 | .0680 | No | |
| Barytocalcite # | 1.525 | 1.684 | 1.686 | B- | 15 | .1610 | No | relatively weak |
| Mangazeite ! | 1.525 | 1.545 | B | .0200 | No | |||
| Lepidolite # | 1.525 to 1.548 | 1.551 to 1.58 | 1.554 to 1.586 | B- | 25-58 | .0290 to .0380 | Yes | weak, r > v |
| Vermiculite # | 1.525 to 1.561 | 1.545 to 1.581 | 1.545 to 1.581 | B- | 0-8 | .0200 | Yes | weak, r > v |
| Teruggite | 1.526 | 1.528 | 1.551 | B+ | 33 | .0250 | No | |
| Shirokshinite ! | 1.526 | 1.553 | 1.553 | B- | 5 | .0270 | No | |
| Anthonyite | 1.526 | 1.602 | 1.602 | B | 3 | .0760 | Yes | |
| Alstonite # | 1.526 | 1.671 | 1.672 | B- | 6 | .1460 | No | r > v weak |
| Rozenite | 1.526 to 1.528 | 1.536 to 1.537 | 1.541 to 1.545 | B- | 90 | .0150 to .0170 | No | |
| Moganite ! | 1.526 | B | No | |||||
| Sulfoborite # | 1.527 | 1.536 | 1.551 | B- | 79.6 | .0240 | No | |
| Kovdorskite | 1.527 | 1.542 | 1.549 | B- | 80 | .0220 | No | r > v very weak |