Tetranatrolite

Formula: Na₂Al₂Si₃O₁₀.2H₂O

Origin of name: from tetragonal and natrolite

Crystal system: tetragonal

Crystal class: -42m

Twinning:

Unit cell: a = 13.10 Å, c = 6.635 Å

Colour: white

Diaphaneity: 

Luster: vitreous to dull

Habit: crystals to 0.1 mm, as epitactic growths on natrolite; fine silky, fibrous sprays

Hardness: 

Specific gravity: 2.28

Cleavage: none

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: dimorphous with natrolite