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Jôkokuite
Jôkokuite from Jokoku Mine, Hokkaido, Japan
General
Category	Sulfate minerals
Formula (repeating unit)	MnSO4・5H2O
IMA symbol	Jôk[1]
Strunz classification	07.CB.20
Dana classification	29.6.7.4
Crystal system	Triclinic
Crystal class	Pinacoidal (1) (same H-M symbol)
Space group	P1
Unit cell	a = 6.37 Å b = 10.77 Å c = 6.13 Å
Identification
Color	Pink, pale pink, light pink, white, colorless
Cleavage	None
Fracture	Conchoidal
Mohs scale hardness	2.5
Luster	Vitreous
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	2.03
Optical properties	Biaxial (−)
Solubility	Soluble in water
References	[2][3]

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]