Sitinakite

Formula: Na₂KTi₄Si₂O₁₃(OH).4H₂O

Origin of name: from elements in composition

Crystal system: tetragonal

Crystal class: 4/m 2/m 2/m

Twinning:

Unit cell: 

Colour: light brown with pale rose tint, colourless

Diaphaneity: 

Luster: vitreous

Habit: equant and short prismatic crystals 1 by 1 by 2 mm, intergrown crystals in 3 to 4 mm patches

Hardness: 4.5

Specific gravity: 2.86

Cleavage: 2; {100} perfect, {001} parting

Tenacity: 

Streak: white

Synonyms/varieties:

Comments: