Hydrohetaerolite

Formula:  Zn₂Mn₄O₈ ^. H₂O

Origin of name:  From Greek hydor = water and hetaerolite

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning: 

Unit cell: a = 5.735, c = 9.005

Colour:  Dark brown to brownish black

Diaphaneity: Opaque

Luster:  Submetallic

Habit:  Massive; botryoidal crusts with fibrous structure, radial

Hardness:  5 to 6

Specific gravity:  4.64

Cleavage:  1; parallel to elongation

Tenacity: 

Streak:  Dark brown

Synonyms/varieties:

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