Takovite

Formula: Ni₆Al₂((OH)₁₆(CO₃,OH).4H₂O

Origin of name: after locality Takovo, Serbia

Crystal system: Hexagonal

Crystal class: 3 2/m

Twinning:

Unit cell: a = 6.04, c = 45.16

Colour: Bluish green, yellowish green, green

Diaphaneity: Transparent

Luster: Pearly

Habit: Massive or in veinlets, microcrystalline, platy, to 1 micron

Hardness:  2

Specific gravity: 2.80

Cleavage: none

Tenacity: 

Streak: 

Synonyms/varieties: Eardleyite

Comments: member of hydrotalcite group