Cancrisilite

Formula:  Na₇[Al₅Si₇O₂₄]CO₃ ^.3H₂O

Origin of name:  From silicon and cancrinite

Crystal system:  Hexagonal

Crystal class:  6mm

Twinning:

Unit cell:

Colour:  Lilac

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Anhedral grains 1-3 mm

Hardness:  5

Specific gravity:  2.40

Cleavage:  None

Tenacity:

Streak:  White

Synonyms/varieties:

Comments:  Dissolves readily at room temperature in 10% HCl; yellow luminescence in UV light