Uniaxial Minerals sorted by Index of Refraction

800 Optically Uniaxial 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 Diaphaneity, Mouse-over Dichroic for Optical Data Reference
Mineral Name	A	B	Sign	Bire	Pleo- chroic	Dispersion
Hydrocerussite #	1.94 ε	2.09 ω	U-	.1500	No
Baotite	1.94 ω	2.16 ε	U+	.2200	Yes
Beudantite #	1.943 ε	1.957 ω	U-	.0140	Yes	none
Hedyphane #	1.948 to 2.01 ε-ω	1.958 to 2.03 ε-ω	U-+	.0100 to .0200	Yes	none
Feitknechtite	1.95 ε	2.055 ω	U-	.1050	No
Geikielite #	1.95 to 1.98 ε	2.31 to 2.35 ω	U-	.3600 to .3700	Yes
Ordonezite #	ω	1.95 ε	U+		No
Dilithium *	1.952 to 1.984 ω	1.971 to 2.01 ε	U+	.0190 to .0260	No
Segnitite	1.955 ε	1.975 ω	U-	.0200	No
Dugganite	1.967 ε	1.977 ω	U-	.0100	No
Ernienickelite	1.97 ε	2 ω	U-	.0300	No
Jagoite #	1.97 ε	2 ω	U-	.0300	No
Calomel #	1.97 ω	2.65 ε	U+	.6800	Yes
Graulichite-(Ce) !	ε	1.97 ω	U-		Yes
Powellite #	1.974 ω	1.984 ε	U+	.0100	Yes	none
Ottensite !	1.99	1.99	U	.0000	Yes	Calculated
Armangite #	1.99 ε	2.01 ω	U-	.0200	No
Ekatite !	1.99 ω	2.08 ε	U+	.0900	Yes
Cassiterite #	1.99 to 2.01 ω	2.093 to 2.1 ε	U+	.1030	Yes	none
Mattheddleite	1.999 ε	2.017 ω	U-	.0180	No
Grechishchevite	2 ω	2 ε	U+	.0000	Yes
Dreyerite	2 ω	2 ε	U+	.0000	Yes
Pseudoboleite #	2 ε	2.03 ω	U-	.0300	No
Wakefieldite-(Y)	2 ω	2.14 ε	U+	.1400	No
Stenhuggarite	2		U		No	low birefringence
Wakefieldite-(Ce)		2	U		No
Argutite	2.01 ω	2.01 ε	U+	.0000	No
Zincite #	2.013 ω	2.029 ε	U+	.0160	Yes	none
Barysilite #	2.015 ε	2.033 ω	U-	.0180	No
Nierite	2.02 ε	2.03 ω	U-	.0100	No
Simpsonite #	2.025 ε	2.045 ω	U-	.0200	Yes
Matlockite #	2.04 ε	2.15 ω	U-	.1100	Yes	none
Pyromorphite #	2.049 ε	2.059 ω	U-	.0100	No	none
Cuzticite	2.05 ε	2.06 ω	U-	.0100	Yes
Yedlinite	2.059 ε	2.125 ω	U-	.0660	No
Abhurite	2.06 ω	2.11 ε	U+	.0500	Yes
Pittongite !	ε	2.085 ω	U-		No
Cuprotungstite #	2.1 ε	2.18 ω	U-	.0800	Yes
Hydrohetaerolite #	2.1 ε	2.26 ω	U-	.1600	No
Iltisite !	2.1 ε	2.3 ω	U-	.2000	Yes
Schuetteite	2.1 ε	ω	U-		Yes
Priderite #	ε	2.1 ω	U-		Yes
Phosgenite #	2.114 ω	2.14 ε	U+	.0260	Yes	none
Parakhinite	2.12 ε	2.155 ω	U-	.0350	No	strong
Hiarneite !	2.12 ω	2.16 ε	U+	.0400	Yes
Santanaite	2.12 ε	2.32 ω	U-	.2000	No
Melanostibite #		2.12	U		No
Mimetite #	2.129 ε	2.144 ω	U-	.0150	No	none
Sphaerobismoite	2.13 ω	2.18 ε	U+	.0500	Yes
Penfieldite #	2.13 ω	2.21 ε	U+	.0800	No
Hetaerolite #	2.14 ε	2.34 ω	U-	.2000	No
Hausmannite #	2.15 ε	2.46 ω	U-	.3100	Yes
Squawcreekite ?	2.18 ω	2.28 ε	U+	.1000	Yes	r > v weak
Mackayite #	2.19 ω	2.21 ε	U+	.0200	Yes
Kleinite #	2.19 ω	2.21 ε	U+	.0200	Yes	strong, r < v
Stolzite #	2.19 ε	2.27 ω	U-	.0800	Yes
Tripuhyite #	2.19 ω	2.33 ε	U+	.1400	No
Calzirtite	2.19 to 2.27 ω	2.3 to 2.36 ε	U+	.1100	No
Tetrarooseveltite	2.2 ω	2.2 ε	U+	.0000	No
Fergusonite-(Ce) *	2.2 ε	2.3 ω	U-	.1000	No
Fergusonite-(Nd) *	2.2 ε	2.3 ω	U-	.1000	No
Zavaritskite	2.21 ε-ω	2.213 ε-ω	U-+	.0030	No
Iodargyrite #	2.21 ω	2.22 ε	U+	.0100	No
Pyrophanite #	2.21 ε	2.48 ω	U-	.2700	Yes
Ecdemite #	2.25 ε	2.32 ω	U-	.0700	No
Plattnerite #	2.25 ε	2.35 ω	U-	.1000	No	none
Tapiolite-(Fe) #	2.27 ω	2.42 ε	U+	.1500	Yes
Finnemanite #	2.2847 ε	2.2949 ω	U-	.0102	No
Pottsite	2.3 ε	2.4 ω	U-	.1000	No
Chiluite	2.3 ε	2.4 ω	U-	.1000	No
Tillmannsite !	2.3 ω	2.5 ε	U+	.2000	Yes
Schiavinatoite !	ω	2.3 ε	U+		No
Wulfenite #	2.304 ε	2.402 ω	U-	.0980	No	none
Langbanite #	2.31 ε	2.36 ω	U-	.0500	No
Asisite	2.32 ε	2.39 ω	U-	.0700	No
Dukeite !	2.33	2.37	U	.0400	No	Calculated
Lorettoite ?	2.33 ε	2.4 ω	U-	.0700	No
Vanadinite #	2.35 ε	2.416 ω	U-	.0660	Yes
Wurtzite #	2.356 ω	2.378 ε	U+	.0220	Yes
Landauite	2.373 ε	2.388 ω	U-	.0150	Yes
Trechmannite #	2.4 ε	2.6 ω	U-	.2000	Yes
Minium #	2.4		U		Yes
Lonsdaleite	2.404 ε-ω	2.404 ε-ω	U-+	.0000	No
Parkinsonite	2.42 ε	2.58 ω	U-	.1600	Yes	anomalously biaxial
Changbaiite	2.476 ω	2.485 ε	U+	.0090	No
Anatase #	2.488 ε	2.561 ω	U-	.0730	Yes
Chrombismite !	2.5 ω	2.55 ε	U+	.0500	No
Senaite #	2.5 ε	ω	U-		No
Greenockite #	2.506 ε-ω	2.529 ε-ω	U-+	.0230	Yes
Litharge #	2.535 ε	2.665 ω	U-	.1300	No
Rutile #	2.605 to 2.621 ω	2.899 to 2.908 ε	U+	.2940	Yes	strong
Hypercinnabar	2.61 ω	2.85 ε	U+	.2400	No
Rambergite !	2.62 to 2.77 ε-ω	2.62 to 2.77 ε-ω	U-+	.0000	No
Moissanite #	2.654 ω	2.967 ε	U+	.3130	Yes
Chalcophanite #	2.72 ε	2.73 ω	U-	.0100	Yes
Proustite #	2.792 ε	3.087 to 3.088 ω	U-	.2950 to .2960	Yes
Hematite #	2.87 to 2.94 ε	3.15 to 3.22 ω	U-	.2800	Yes	very strong
Pyrargyrite #	2.881 ε	3.084 ω	U-	.2030	Yes
Cinnabar #	2.905 ω	3.256 ε	U+	.3510	Yes