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
Methane hydrate-I ! 1.3    I Transparent
Villiaumite # 1.33    I Transparent Ford32
Hieratite # 1.34    I Transparent Ford32
Cryolithionite # 1.34    I Transparent Ford32
Carobbiite # 1.362    I Transparent Enc. of Minerals,2nd ed.,1990
Cryptohalite # 1.369    I Transparent Enc. of Minerals,2nd ed.,1990
Elpasolite # 1.376    I Transparent Enc. of Minerals,2nd ed.,1990
Griceite  1.392    I Translucent Dana8
Melanophlogite # 1.425 to 1.457    I Transparent to Translucent AntBidBlaNic2
Melanophlogite-beta ! 1.425 to 1.457    I Transparent to Translucent AntBidBlaNic2
Yttrocerite * 1.43    I Translucent Dana
Opal # 1.43    I Transparent to translucent to opaque Enc. of Minerals,2nd ed.,1990
Ralstonite # 1.43    I Transparent to translucent Ford32
Meniaylovite ! 1.43    I Transparent
Fluorite # 1.433    I Transparent to subtranslucent Mason68
Alum-(Na) # 1.4388    I Transparent Enc. of Minerals,2nd ed.,1990
Chukhrovite-(Y)  1.44    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Chukhrovite-(Ce)  1.443    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Alum-(K) # 1.453    I Transparent Dana7
Sulphohalite # 1.455    I Transparent Enc. of Minerals,2nd ed.,1990
Tschermigite # 1.459    I Transparent to translucent Ford32
Natrophosphate  1.46 to 1.462    I Transparent Enc. of Minerals,2nd ed.,1990
Faujasite-Ca ! 1.47 to 1.48    I Transparent to translucent Dana8
Faujasite-Na # 1.47 to 1.48    I Transparent to translucent Dana8
Faujasite-Mg ! 1.47 to 1.48    I Transparent to translucent Dana8
Allophane # 1.47 to 1.496    I Translucent Heinrich65
Imogolite  1.47 to 1.51    I Transparent Dana8
Paulingite-Na ! 1.472 to 1.484    I Dana8
Paulingite-K  1.472 to 1.484    I Transparent Dana8
Paulingite-Ca ! 1.473 to 1.482    I Transparent Enc. of Minerals,2nd ed.,1990
Frankdicksonite  1.475    I Transparent Enc. of Minerals,2nd ed.,1990
Nosean # 1.48 to 1.495    I Transparent to Translucent Ford32
Lonecreekite  1.483    I Transparent Enc. of Minerals,2nd ed.,1990
Sodalite # 1.483 to 1.484    I Transparent to translucent Enc. of Minerals,2nd ed.,1990
Evansite # 1.485    I Transparent to translucent Ford32
Cristobalite # 1.485 to 1.487    I Translucent to transparent Heinrich65
Dansite # 1.488    I Enc. of Minerals,2nd ed.,1990
Sylvite # 1.49    I Transparent Enc. of Minerals,2nd ed.,1990
Lanmuchangite ! 1.495    I Transparent AmMin, vol 87, p 996
Hauyne # 1.4961    I Subtransparent to translucent Ford32
Lechatelierite * 1.5    I Translucent Enc. of Minerals,2nd ed.,1990
Nastrophite  1.5    I Transparent Enc. of Minerals,2nd ed.,1990
Rosieresite # 1.5    I Ford32
Bolivarite # 1.5 to 1.51    I Translucent Enc. of Minerals,2nd ed.,1990
Lazurite # 1.5 to 1.522    I Translucent Dana8
Ertixiite  1.502    I Transparent Enc. of Minerals,2nd ed.,1990
Tschortnerite ! 1.504    I Transparent AmMin
Nabaphite  1.504    I Transparent Enc. of Minerals,2nd ed.,1990
Leucite # 1.508 to 1.511    I Translucent to transparent Mason68
Tychite # 1.51    I Transparent Enc. of Minerals,2nd ed.,1990
Cadwaladerite # 1.513    I Transparent Enc. of Minerals,2nd ed.,1990
Northupite # 1.514    I Transparent to translucent Ford32
Pollucite # 1.52    I Transparent Enc. of Minerals,2nd ed.,1990
Pahasapaite  1.523    I Transparent Enc. of Minerals,2nd ed.,1990
Viseite # 1.53    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Lesukite ! 1.53 to 1.55    I Transparent MinRec
Langbeinite # 1.536    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Amber * 1.54    I Transparent
Thorogummite # 1.54 to 1.64    I Opaque Enc. of Minerals,2nd ed.,1990
Halite # 1.544    I Transparent Enc. of Minerals,2nd ed.,1990
Manganotychite  1.544    I Transparent Am.Min.,Vol.77,p448,1992
Ferrotychite  1.55    I Transparent Enc. of Minerals,2nd ed.,1990
Efremovite  1.55    I Subtranslucent to Opaque Am.Min.,Vol.76,p299,1991
Gutsevichite ? 1.56 to 1.6    I Translucent Dana8
Zaratite # 1.56 to 1.61    I Translucent Ford32
Alumopharmacosiderite  1.565    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Phosphovanadylite ! 1.566    I Transparent AmMin
Yeelimite  1.568    I Transparent Enc. of Minerals,2nd ed.,1990
Nitrobarite # 1.5714    I Transparent Enc. of Minerals,2nd ed.,1990
Manganolangbeinite # 1.572    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Schoenfliesite  1.59    I Transparent Enc. of Minerals,2nd ed.,1990
Georgeite  1.593    I Transparent to Subopaque Enc. of Minerals,2nd ed.,1990
Voltaite # 1.593 to 1.608    I Opaque Dana8
Zunyite # 1.6    I Transparent Ford32
Arsenobismite ? 1.6    I Dana
Stibiconite # 1.6 to 1.97    I Transparent to translucent Ford32
Zincovoltaite  1.605    I Transparent to Translucent Am.Min.,Vol.75,p244,1990
Partzite # 1.61 to 1.82    I Translucent Enc. of Minerals,2nd ed.,1990
Hsianghualite # 1.6132    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Metaborite  1.618    I Transparent Enc. of Minerals,2nd ed.,1990
Bicchulite  1.625    I Transparent Enc. of Minerals,2nd ed.,1990
Thorosteenstrupine  1.63 to 1.66    I Translucent to Opaque Enc. of Minerals,2nd ed.,1990
Griphite # 1.63 to 1.687    I Translucent AntBidBlaNic4
Tritomite-(Y)  1.63 to 1.77    I Translucent to Subopaque Enc. of Minerals,2nd ed.,1990
Katoite  1.632    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Sakhaite  1.638 to 1.648    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Tombarthite-(Y)  1.639    I Translucent to opaque Enc. of Minerals,2nd ed.,1990
Umbozerite  1.64    I Enc. of Minerals,2nd ed.,1990
Mayenite  1.643    I Transparent Enc. of Minerals,2nd ed.,1990
Tritomite-(Ce) # 1.65 to 1.757    I Translucent to Subopaque Enc. of Minerals,2nd ed.,1990
Ferrisymplesite # 1.67    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Rondorfite ! 1.67    I Transparent CanMin, 42:1283
Hibschite # 1.675    I Transparent to translucent Ford32
Panichiite ! 1.68    I Transparent CanMin, v47:367
Londonite ! 1.693    I Transparent AmMin, Vol 87, p 356
Pharmacosiderite # 1.693    I Subtransparent to subtranslucent Ford32
Salammoniac # 1.693    I Transparent Ford32
Rhodizite # 1.6935    I Transparent to Translucent Enc. of Minerals,2nd ed.,1990
Santabarbaraite ! 1.695    I Translucent AmMin, v 88, p 1838
Wickmanite  1.705    I Transparent Enc. of Minerals,2nd ed.,1990