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
Perite  2.35 B+ No
Montroydite # 2.37 2.5 2.65 B+ 75 .2800 No
Freudenbergite  2.37 to 2.42 B+ No
Stibiotantalite # 2.3742 2.4039 2.4568 B+ 75.083 .0826 No relatively strong
Bismutocolumbite  2.38 2.42 2.47 B+ 85 .0900 No
Phoenicochroite # 2.38 2.44 2.65 B+ 58 .2700 No r > v strong
Uzonite  2.38 2.68 B+ .3000 No
Srilankite  2.38 B- 16 Yes high birefringence
Bismutotantalite # 2.388 2.403 2.428 B+ 80 .0400 No r < v
Thoreaulite # 2.39 2.42 2.52 B+ 25-35 .1300 No
Alacranite  2.39 2.52 B+ .1300 Yes
Stibiocolumbite # 2.3977 2.419 2.4588 B+ 73.417 .0611 No
Orpiment # 2.4 2.81 3.02 B- 76 .6200 Yes r > v strong
Pucherite # 2.41 2.5 2.51 B- 19 .1000 Yes marked to extreme, r < v
Shcherbinaite  2.42 B No
Girdite  2.44 2.47 2.48 B- 70 .0400 No r > v strong
Wattersite  2.44 to 2.52 2.7 to 2.86 B .2600 to .3400 Yes
Derbylite # 2.45 2.45 2.51 B+ ~0 .0600 No
Chekhovichite  2.45 2.5 2.65 B- 65 .2000 No r < v distinct
Pinalite  2.49 2.495 2.505 B+ 70-70.5 .0150 Yes r > v moderate
Massicot # 2.51 2.61 2.71 B+ 90 .2000 No none
Koechlinite # 2.52 2.61 2.67 B- large .1500 No r < v strong
Realgar # 2.538 2.684 2.704 B- 40 .1660 Yes r > v very strong
Brookite # 2.583 to 2.584 2.584 to 2.588 2.705 to 2.741 B+ 10 .1220 to .1570 No relatively strong
Pyrostilpnite # 2.7 2.7 2.7 B+ .0000 Yes
Schreyerite  2.7 B No
Pearceite # 2.7 B No
Dufrenoysite # 2.71 B No
Kermesite # 2.72 2.74 2.74 B+ .0200 Yes
Miargyrite # 2.72 2.78 B+ .0600 Yes
Getchellite  2.72 B+ <46 No r > v strong
Lorandite # 2.72 B+ 70-90 No r >> v strong
Arsenpolybasite  2.72 B- 22 No very strong
Vrbaite # 2.72 B+ No r > v
Livingstonite # 2.72 to 2.8 B- No
Fangite  2.78 to 2.81 B No
Gillulyite  2.81 B No
Xanthoconite # 3 B- 34 No r < v
Hutchinsonite # 3.078 3.176 3.188 B- 37.4 .1100 No marked to extreme, r < v
Smithite # 3.27 B- ~65 Yes
Sahlinite # 3.3 B- No