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)

Minimum Index	Maximum Index		Reset to Default

Pages: [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] [ 7 ] [ 8 ] [ 9 ] [ 10 ] [ 11 ] [ 12 ] [ 13 ] [ 14 ] [ 15 ] [ 16 ] [ 17 ] [ 18 ] [ 19 ] [ 20 ] [ 21 ] [ 22 ] [ 23 ] [ 24 ] Optical Help

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
Paganoite !	2.07		2.09	B		.0200	Yes	Calculated
Laurionite #	2.077	2.116	2.158	B-	70	.0810	No
Duhamelite ?	2.08	2.11		B			Yes
Gebhardite	2.08		2.12	B-		.0400	No
Coquandite		2.08		B+	80-85		No
Montanite #	2.09	2.09		B-	0-15		Yes	r < v extreme
Tungstite #	2.09	2.24	2.26	B-	0-10	.1700	No
Mounanaite		2.09		B			Yes
Lakargiite !	2.1	2.1	2.1	B+	close to 0	.0000	Yes
Phyllotungstite	2.1	2.183 to 2.185	2.185	B-	0-18	.0850	No
Kentrolite #	2.1	2.2	2.31	B+	88	.2100	Yes	strong, r < v
Sundiusite	2.1		2.17	B+		.0700	No
Rodalquilarite	2.1		2.2	B-	38	.1000	No
Edgarbaileyite	2.1		2.58	B		.4800	Yes
Zimbabweite	2.1			B+	80		Yes	r < v very strong
Namibite	2.1			B-	moderate		Yes
Trimounsite-(Y)	2.1			B-			No	r > v strong
Peterbaylissite	2.1			B			No
Natroniobite	2.1 to 2.13	2.19 to 2.21	2.21 to 2.24	B+	10-30	.1100	No	r < v
Gerstleyite #		2.1		B			Yes
Rankamaite		2.1		B			No
Calderonite !		2.1		B+	86		Yes
Hemihedrite	2.105	2.32	2.65	B+	88	.5450	No	strong
Khinite	2.11	2.112	2.165	B+	20	.0550	Yes	strong
Balyakinite	2.11	2.18	2.22	B-	80	.1100	No
Vauquelinite #	2.11	2.22	2.22	B-	near zero	.1100	Yes
Schneiderhohnite	2.11		2.13	B+		.0200	Yes
Rajite	2.115	2.135	2.26	B+	40	.1450	No
Melanotekite #	2.12	2.17	2.31	B+	67	.1900	No
Seeligerite	2.12	2.32	2.32	B-	4	.2000	No
Molybdomenite #	2.12		2.14	B-	80	.0200	No
Symesite !	2.12		2.16	B		.0400	No	2V could not be measured
Tranquillityite	2.12			B	40		No
Bismutite #	2.12 to 2.15	2.12 to 2.15	2.28	B		.1600	No
Preisingerite	2.13	2.16	2.195	B	90	.0650	No
Baddeleyite #	2.13	2.19	2.2	B-	30	.0700	No	strong, r > v
Angelellite	2.13	2.2	2.4	B+		.2700	No
Jeppeite	2.13	2.21	2.35	B		.2200	Yes
Atelestite #	2.14	2.15	2.18	B+	44	.0400	No
Rooseveltite #	2.14	2.15	2.18	B+	50	.0400	No
Eztlite	2.14		2.15	B		.0100	Yes
Fornacite #	2.14		2.24	B+	large	.1000	No
Vigezzite	2.14		2.315	B+	large	.1750	No	extreme
Tantalite-(Mn) #	2.14 to 2.19	2.15 to 2.25	2.22 to 2.34	B+		.0800 to .1500	Yes	r < v
Clinomimetite		2.14 to 2.15		B-	8		No
Yttrocolumbite-(Y) #		2.15		B+			No
Biehlite !		2.15		B			No	Calculated
Chloroxiphite #	2.16	2.24	2.25	B-	70	.0900	Yes
Georgiadesite #	2.17	2.17	2.18	B+		.0100	No
Hubnerite #	2.17 to 2.2	2.22	2.3 to 2.32	B+	73	.1300	Yes
Valentinite #	2.18	2.35	2.35	B-	10	.1700	Yes
Onoratoite		2.18 to 2.23	2.23 to 2.26	B-			No
Heyite	2.185	2.219	2.266	B	89	.0810	No
Descloizite #	2.185	2.265	2.35	B-	85-90	.1650	No	relatively strong
Fervanite #	2.186	2.222	2.224	B-	0-20	.0380	No	relatively strong
Plumbotellurite	2.19	2.23	2.35	B+	50	.1600	No
Mereheadite !	2.19		2.28	B		.0900	No
Cotunnite #	2.199	2.217	2.26	B+	67.2	.0610	No
Embreyite	2.2	2.36	2.36	B-	0-10	.1600	No
Capgaronnite	2.2		2.3	B-		.1000	No
Schumacherite	2.2		2.3 to 2.42	B+	~90	.1000 to .2200	No
Russellite #		2.2		B+	0		No
Bannermanite		2.2		B			No
Chervetite		2.2 to 2.6		B-	65-75		No
Mottramite #	2.21	2.31	2.33	B-	73	.1200	No
Krettnichite !	2.21		2.39	B		.1800	Yes
Schlegelite !	2.22	2.255	2.26	B-	42	.0400	No	Calculated index values
Srebrodolskite	2.24	2.25	2.27	B-		.0300	No
Mendipite #	2.24	2.27	2.31	B-+	90	.0700	No
Oboyerite	2.24		2.26	B		.0200	No	none
Manganite #	2.25	2.25	2.53	B+		.2800	Yes	r > v very strong
Schwartzembergite #	2.25	2.35	2.36	B-	small	.1100	No	very weak
Iranite	2.25		2.4 to 2.5	B		.1500 to .2500	No
Kenhsuite !		2.25	2.25	B+	70-80		Yes	r > v extreme
Sanmartinite #		2.25 to 2.28		B+			No
Ferberite #	2.255	2.305	2.414	B+	68	.1590	Yes
Hechtsbergite !	2.26	2.27	2.3	B+	50	.0400	Yes
Tantalite-(Fe)	2.26	2.3 to 2.4	2.43	B+		.1700	No
Goethite #	2.26 to 2.275	2.393 to 2.409	2.398 to 2.515	B-	0-27	.1380 to .2400	Yes	r > v extreme
Raspite #	2.27	2.27	2.3	B+	0	.0300	No
Macquartite	2.28	2.31	2.34	B-	85	.0600	No
Brackebuschite #	2.28	2.36 to 2.38	2.48 to 2.49	B+	~90	.2000 to .2100	Yes	r > v strong
Tungstibite	2.285	2.4	2.58	B+	82	.2950	Yes	strong, r < v
Fairbankite	2.29	2.31	2.33	B	86	.0400	No
Leningradite		2.29	2.35	B-			No
Columbite-(Fe) #		2.29 to 2.4		B+			No	r < v
Foordite		2.294		B+			No
Perovskite #	2.3	2.34	2.38	B+	90	.0800	Yes	r > v
Nadorite #	2.3	2.35	2.4	B+	85	.1000	No	r > v strong
Perroudite	2.3	2.4		B+	~70		Yes	r > v very strong
Quenselite #	2.3			B+			No
Lueshite		2.3		B	45		No
Ashanite ?	2.31	2.35	2.4	B+	70-75	.0900	Yes
Crocoite #	2.31	2.37	2.66	B+	57	.3500	Yes	none
Pyrobelonite #	2.32	2.36	2.37	B-	29	.0500	Yes	r > v
Lucasite-(Ce)		2.321		B			No
Columbite-(Mg)	2.33 to 2.36		2.39 to 2.44	B-	~80	.0600 to .0800	Yes
Smirnite	2.35	2.36	2.46	B+	35-40	.1100	No
Terlinguaite #	2.35	2.64	2.66	B-	20	.3100	No	relatively strong
Pseudobrookite #	2.35 to 2.38	2.36 to 2.39	2.38 to 2.42	B+	50	.0300 to .0400	Yes