Honessite

Formula:  Ni₆Fe₂(SO₄)(OH)₁₆ ^. 4H₂O

Origin of name:  For A. Honess, American mineralogist

Crystal system:  Hexagonal

Crystal class:  Unknown

Twinning: 

Unit cell: a = 3.08 Ǻ, c = 26.71 Ǻ

Colour:  Yellow, green to brown

Diaphaneity: 

Luster:  Dull

Habit:  Fine-grained, fibrous

Hardness:  1

Specific gravity: 

Cleavage:  None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Related to the hydrotalcite group