Mineralogy Database

Isotropic Minerals sorted by Index of Refraction

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   242 Optically Isotropic 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
Mineral Name n Sign Diaphaneity Reference
Natropharmacosiderite  1.705    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Wadalite  1.708    I Transparent AmMin
Berzeliite # 1.71    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Dzhalindite  1.716 to 1.725    I Transparent to Subopaque Enc. of Minerals,2nd ed.,1990
Delvauxite # 1.72    I Ford32
Spinel # 1.72 to 1.8    I Transparent to translucent to opaque Enc. of Minerals,2nd ed.,1990
Rowlandite-(Y) # 1.725    I Transparent to Subopaque Ford32
Helvite # 1.728 to 1.747    I Translucent to opaque Enc. of Minerals,2nd ed.,1990
Pyrope # 1.73 to 1.76    I Transparent to subtranslucent Sinkankas66
Grossular # 1.734 to 1.75    I Transparent to subtranslucent Enc. of Minerals,2nd ed.,1990
Vismirnovite  1.735    I Transparent Enc. of Minerals,2nd ed.,1990
Sohngeite  1.736    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Periclase # 1.74    I Transparent to translucent Enc. of Minerals,2nd ed.,1990
Genthelvite # 1.742 to 1.745    I Transparent Enc. of Minerals,2nd ed.,1990
Danalite # 1.753 to 1.771    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Arsenolite # 1.755    I Transparent to translucent Ford32
Natanite  1.755    I Transparent Enc. of Minerals,2nd ed.,1990
Yttrialite-(Y) # 1.758    I Enc. of Minerals,2nd ed.,1990
Ringwoodite  1.768    I Enc. of Minerals,2nd ed.,1990
Stibiobetafite  1.78    I Translucent to Opaque AntBidBlaNic3
Gadolinite-(Ce)  1.78    I Transparent Enc. of Minerals,2nd ed.,1990
Manganberzeliite # 1.78 to 1.79    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Manganbelyankinite # 1.78 to 1.8    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Hercynite # 1.8    I Opaque Ford32
Majorite  1.8    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Spessartine # 1.8    I Transparent to translucent Enc. of Minerals,2nd ed.,1990
Cesstibtantite  1.8    I Transparent to Opaque AntBidBlaNic3
Yafsoanite  1.8    I Enc. of Minerals,2nd ed.,1990
Knorringite  1.803    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Gahnite # 1.82    I Subtransparent to opaque Ford32
Goldmanite  1.821 to 1.855    I Transparent to Subopaque Enc. of Minerals,2nd ed.,1990
Yamatoite ! 1.855    I Dana8
Liandratite  1.83    I Translucent Dana8
Almandine # 1.83    I Transparent to Subtransparent to translucent Enc. of Minerals,2nd ed.,1990
Yttropyrochlore-(Y)  1.83 to 1.835    I Translucent to Opaque AntBidBlaNic3
Romeite # 1.83 to 1.87    I Transparent to Subopaque Ford32
Lime # 1.838    I Enc. of Minerals,2nd ed.,1990
Bindheimite # 1.84 to 1.87    I Translucent to Opaque Ford32
Haleniusite-(La) ! 1.85    I Translucent CanMin, 42:1097
Uvarovite # 1.86    I Transparent to translucent Enc. of Minerals,2nd ed.,1990
Andradite # 1.87 to 1.89    I Transparent to translucent Mason68
Calderite # 1.872    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Asselbornite  1.9    I Translucent Enc. of Minerals,2nd ed.,1990
Alumotungstite  1.9    I Dana8
Pyrochlore # 1.9 to 2.2    I Subtranslucent to opaque AntBidBlaNic3
Betafite # 1.91 to 2.197    I Translucent to Opaque AntBidBlaNic3
Galaxite # 1.923    I Opaque AntBidBlaNic3
Nantokite # 1.93    I Transparent to subtranslucent Ford32
Kalipyrochlore  1.93 to 1.99    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Menezesite ! 1.93 to 2.03    I Transparent AmMin, v93:81
Polyakovite-(Ce) ! 1.931 to 1.935    I Opaque to translucent AmMin, Vol 87, p 766
Kimzeyite  1.94    I Transparent to Subopaque Enc. of Minerals,2nd ed.,1990
Schaferite ! 1.94    I Transparent MinRec
Schorlomite # 1.94 to 1.98    I Translucent to Subopaque Dana8
Stetefeldtite # 1.95    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Plumbomicrolite  1.95 to 2.02    I Translucent Enc. of Minerals,2nd ed.,1990
Palenzonaite  1.965    I Transparent to Translucent Am.Min.,Vol.73,p930,1988
Uranmicrolite # 1.97    I Transparent to Opaque Enc. of Minerals,2nd ed.,1990
Moluranite  1.97 to 1.98    I Translucent Enc. of Minerals,2nd ed.,1990
Uranpyrochlore  1.98    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Magnussonite # 1.98    I Enc. of Minerals,2nd ed.,1990
Morimotoite  1.995    I Opaque MinRec
Fergusonite-beta-(Nd)  2    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Stibiomicrolite # 2    I Translucent to Opaque AntBidBlaNic3
Bismutomicrolite  2    I Translucent to Opaque
Kadyrelite  2    I Transparent AntBidBlaNic3
Nabiasite ! 2 to 2.1    I Transparent MinRec, Vol 31, No 4
Microlite # 2 to 2.2    I Subtranslucent to opaque Mason68
Mcalpineite  2.01    I Transparent to translucent MinRec, v 27, p 118
Fluornatromicrolite ! 2.03    I Transparent CanMin, Vol 38
Choloalite  2.04    I Enc. of Minerals,2nd ed.,1990
Eulytite # 2.05    I Transparent to translucent Ford32
Boleite # 2.05    I Transparent to subtranslucent Dana8
Fergusonite-(Y) # 2.05 to 2.19    I Subtranslucent to opaque Enc. of Minerals,2nd ed.,1990
Formanite-(Y) # 2.05 to 2.19    I Subtranslucent to Opaque Enc. of Minerals,2nd ed.,1990
Mosesite # 2.06    I Translucent to subtranslucent Dana
Monimolite # 2.06    I Translucent to Opaque Dana8
Euxenite-(Y) # 2.06 to 2.24    I Translucent to opaque AntBidBlaNic3
Chlorargyrite # 2.07    I Transparent to translucent Enc. of Minerals,2nd ed.,1990
Bariopyrochlore  2.07 to 2.11    I Transparent to Translucent AntBidBlaNic3
Stannomicrolite  2.08    I Translucent Enc. of Minerals,2nd ed.,1990
Strontiopyrochlore * 2.08    I Translucent to Opaque Am.Min.,Vol.73,p930,1988
Plumbopyrochlore  2.08    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Chromite # 2.08 to 2.16    I Opaque AntBidBlaNic1
Gianellaite  2.085    I Enc. of Minerals,2nd ed.,1990
Senarmontite # 2.087    I Transparent to translucent Ford32
Bismutostibiconite  2.09    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Ferritungstite # 2.09 to 2.15    I Translucent AntBidBlaNic3
Samarskite-(Yb) ! 2.1    I Nearly opaque CanMin, v44:1119
Bismutopyrochlore ! 2.1    I Translucent AmMin, vol 85, p 1561
Thorutite # 2.1    I Translucent
Murataite  2.11 to 2.13    I Translucent to Opaque AntBidBlaNic3
Yttrocrasite-(Y) # 2.12 to 2.15    I Opaque Enc. of Minerals,2nd ed.,1990
Oldhamite # 2.137    I Transparent Enc. of Minerals,2nd ed.,1990
Aeschynite-(Y)  2.142    I Transparent to subtranslucent Enc. of Minerals,2nd ed.,1990
Yttrotantalite-(Y) # 2.15    I Opaque to subtranslucent Enc. of Minerals,2nd ed.,1990
Embolite * 2.15    I Transparent to translucent Dana
Fergusonite-beta-(Ce)  2.155    I Subtranslucent to Opaque AntBidBlaNic3
Blakeite # 2.16    I Enc. of Minerals,2nd ed.,1990
Manganosite # 2.16 to 2.17    I Transparent to translucent to opaque AntBidBlaNic3