Pitiglianoite

Formula: Na₆K₂Si₆Al₆O₂₄(SO₄).2H₂O

Origin of name: after locality Pitigliano, Italy

Crystal system: hexagonal

Crystal class: 6

Twinning: 

Unit cell: 

Colour: colourless

Diaphaneity: transparent

Luster: vitreous

Habit: euhedral hexagonal prisms to 1 by 4 mm

Hardness: 5

Specific gravity: 2.37

Cleavage: none

Tenacity: 

Streak: white

Synonyms/varieties:

Comments: a felspathoid