Biaxial Minerals sorted by Index of Refraction

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
Nickelschneebergite !	1.94	1.95	1.97	B+	77	.0300	Yes
Gartrellite	1.94	1.98	2.06	B+	78	.1200	No
Mawbyite	1.94	2	2.04	B-	80	.1000	No
Tooeleite	1.94	2.04 to 2.05	2.05 to 2.06	B-	small	.1100 to .1200	Yes	r > v slight
Lepidocrocite #	1.94	2.2	2.51	B+	83	.5700	Yes	relatively weak
Sayrite		1.94	1.95	B-			No
Wilhelmkleinite !		1.94		B			Yes
Wherryite #	1.942	2.01	2.024	B-	50	.0820	No
Alamosite #	1.947	1.961	1.968	B-	65	.0210	No
Bayldonite #	1.95	1.97	1.99	B+		.0400	No
Cafetite	1.95	2.08	2.11	B-	38	.1600	No
Kassite	1.95	2.13	2.21	B-	58	.2600	No	very strong, r > v
Vanadomalayaite	1.95		2.105	B+	17-40	.1550	Yes
Rameauite		1.95	1.97	B	32		No
Klebelsbergite #		1.95		B-	70		No
Hashemite	1.952	1.96	1.977	B+	35-57	.0250	No
Kuranakhite	1.952		2.002	B		.0500	No
Sulfur #	1.9579	2.0377	2.2452	B+	68.967	.2873	No	relatively weak
Uranosphaerite #	1.959	1.981	2.06	B+	56	.1010	Yes	strong, r < v
Jamesite	1.96	1.995	2.02	B-	75	.0600	No
Brownmillerite	1.96	2.01	2.04	B-	75	.0800	Yes
Ludlockite	1.96	2.055	2.11	B+		.1500	Yes
Ludlockite-(Pb) *	1.96	2.055	2.11	B+		.1500	Yes
Karibibite	1.96	2.1	2.1	B-		.1400	Yes
Kerstenite ?	1.96		1.98	B	50	.0200	No
Orlandiite !		1.96		B			No
Emmonsite #	1.962	2.09	2.1 to 2.12	B-	23	.1380 to .1580	No	relatively strong
Hyalotekite #	1.963	1.963	1.966	B+	small	.0030	No	strong, r < v
Chevkinite-(Ce) #	1.967 to 1.973	2.02	2.05	B-		.0830	Yes
Arsentsumebite #	1.97	1.992	2.011	B-	88	.0410	No
Beyerite #	1.97	2.13	2.13	B		.1600	No	pseudo uniaxial
Steropesite !		1.97		B			No	measured by brewster angl
Rosickyite #		1.97 to 2.058		B-			No	high
Kuksite	1.971		1.981	B-	12-20	.0100	Yes
Dingdaohengite-(Ce) !	1.978		2.01	B-		.0320	Yes
Allochalcoselite !	1.98	2.01	2.08	B+		.1000	Yes
Fiedlerite #	1.98	2.04	2.1	B-		.1200	No
Carlfriesite	1.982	2.095	2.19	B-	80	.2080	No
Cheremnykhite	1.986	1.9965	1.997	B-	20	.0110	Yes	r > v
Elyite	1.99	1.993	1.994	B-	66	.0040	No
Arsendescloizite	1.99	2.03	2.035	B-	30	.0450	No
Bushmakinite !	1.99	2.03	2.06	B-	large	.0700	No	appreciable, r < v
Cervandonite-(Ce)	1.99		2	B		.0100	Yes
Tokyoite !	1.99		2.03	B		.0400	Yes
Clarkeite #	1.997	2.098	2.108	B-	30-50	.1110	Yes	relatively weak
Alumotantite	2	2	2	B-	66	.0000	No
Turanite #	2	2.01	2.02	B-		.0200	Yes	strong, r > v
Hendersonite	2	2.1	2.1	B-	medium	.1000	Yes
Pingguite	2	2.145		B			No
Tellurite #	2	2.18	2.35	B-	90	.3500	No
Xocolatlite !	2		2	B		.0000	Yes
Cervantite #	2		2.1	B		.1000	No
Chursinite	2			B			Yes
Hephaistosite !	2			B			No
Aurorite	2			B			No
Straczekite	2			B-	large		Yes
Pseudocotunnite #		2		B			No
Nealite		2		B			Yes
Radtkeite		2		B+			No
Frankhawthorneite		2		B			No
Titanowodginite		2		B+			No
Arsenbrackebuschite		2		B-			No
Nealite-(H2O) *		2		B			Yes
Cavoite !		2		B			No
Poyarkovite		2		B			Yes
Carmichaelite !		2 to 2.9		B			No	Calculated
Challacolloite !	2.004	2.01	2.024	B+		.0200	No
Volborthite #	2.01	2.04	2.07	B-	large	.0600	No
Tangeite #	2.01	2.05	2.09	B+	83	.0800	No
Stanekite !	2.01	2.11		B			No
Bokite	2.01		2.06	B		.0500	Yes
IMA2000-026 !	2.01			B			No
Santafeite #	2.01			B			Yes
Agrinierite		2.01	2.06	B	55		No
Gamagarite #	2.016	2.04	2.13	B+	46-62	.1140	No
Sonoraite	2.018	2.023	2.025	B-	20-25	.0070	No
Neustadtelite !	2.02	2.08	2.12	B-	65	.1000	Yes
Cobaltneustadtelite !	2.02	2.09	2.12	B-	65	.1000	Yes
Pararealgar		2.02		B			Yes
Shakhovite	2.03	2.03	2.03	B		.0000	Yes	high birefringence
Medenbachite !	2.03	2.09	2.1	B-	43	.0700	No	r > v
Scotlandite	2.035	2.04	2.085	B+	35	.0500	No	r < v strong
Duftite-beta ?	2.04	2.08	2.1	B-		.0600	No
Duftite-alpha #	2.04	2.08	2.1	B-		.0600	No
Smrkovecite !	2.05	2.06	2.09	B+	58-61	.0400	No
Paralaurionite #	2.05	2.15	2.2	B-		.1500	No
Wolsendorfite #	2.05		2.09	B		.0400	No
Molybdofornacite	2.05		2.15	B+		.1000	Yes
Blixite #	2.05		2.2	B+	80	.1500	No
Carminite #	2.05 to 2.07	2.05 to 2.07	2.06 to 2.08	B+	medium	.0100	Yes	r > v strong
Scheteligite ?		2.05		B			No
Vesignieite #	2.053	2.129	2.133	B-	60	.0800	No
Ziesite		2.055		B			No
Georgbokiite !	2.06	2.11	2.15	B-	70	.0900	Yes
Curite #	2.06	2.11	2.15	B-	70	.0900	No
Brendelite !	2.06	2.15	2.19	B-	70.5	.1300	Yes
Petitjeanite	2.06		2.13	B+	75	.0700	No
Fergusonite-beta-(Y)	2.06 to 2.19	2.06 to 2.19	2.06 to 2.19	B-+	0	.0000	No
Fersmite #	2.07	2.08	2.19	B+	20-25	.1200	Yes
Trigonite #	2.07	2.1	2.12	B-		.0500	No