Manganotychite

Formula:  Na₆Mn₂(SO₄)(CO₃)₄

Origin of name:  From manganese and tychite

Crystal system:  Cubic

Crystal class:  2/m -3

Twinning: 

Unit cell: 

Colour:  Pale pink

Diaphaneity: 

Luster:  Dull vitreous

Habit:  Irregular grains to 1 cm, massive aggregates to 5 cm

Hardness:  4

Specific gravity:  2.70

Cleavage:  None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Mn analogue of tychite and ferrotychite; weakly magnetic; dissolves slightly in cold water; effervesces in weak acids