Zincaluminite

Formula: Zn6Al6(SO4)2(OH)26 .5H2O

Origin of name: from zinc and aluminium

 

Crystal system: Hexagonal

Crystal class: Unknown

Twinning:

Unit cell:

 

Colour: White, bluish white, pale blue

Diaphaneity: Translucent

Luster:

Habit: Crystals thin hexagonal plates, minute; tufted aggregates; crusts, microscopic crystals

Hardness: 2.5 to 3

Specific gravity: 2.26

Cleavage: None

Tenacity:

Streak: White

 

Synonyms/varieties:

 

Comments:

 

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