Tuliokite

Formula: Na₆BaTh(CO₃)₆.6H₂O

Origin of name: after locality Tuliok River, Russia

Crystal system: hexagonal

Crystal class: unknown

Twinning:

Unit cell: 

Colour: light or dark gray

Diaphaneity: 

Luster: vitreous

Habit: crystals prismatic, up to 4 mm, rhombohedral crystals

Hardness: 3 to 4

Specific gravity: 3.15

Cleavage: none

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: easily soluble in 10% HCl with effervescence