Jôkokuite is a manganese sulfate mineral with chemical formula MnSO4・5H2O. It crystallizes in the triclinic crystal system.[2][3] It was discovered in 1976 by Matsuo Nanbu at the Jokoku mine in Hokkaido, and is named after the location.[4]

Jôkokuite
Jôkokuite from Jokoku Mine, Hokkaido, Japan
General
CategorySulfate minerals
Formula
(repeating unit)
MnSO4・5H2O
IMA symbolJôk[1]
Strunz classification07.CB.20
Dana classification29.6.7.4
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Unit cella = 6.37 Å
b = 10.77 Å
c = 6.13 Å
Identification
ColorPink, pale pink, light pink, white, colorless
CleavageNone
FractureConchoidal
Mohs scale hardness2.5
LusterVitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.03
Optical propertiesBiaxial (−)
SolubilitySoluble in water
References[2][3]

References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b "Jôkokuite". www.mindat.org. Retrieved 2023-01-15.
  3. ^ a b "Jokokuite". webmineral.com. Retrieved 2023-01-15.
  4. ^ 松原聡 (2006). フィールドベスト図鑑 vol.15 日本の鉱物. 株式会社学習研究社. ISBN 4-05-402013-5.