Terranovaite

Formula: NaCaAl₃Si₁₇O₄₀.>7H₂O

Origin of name: after locality, the Italian Antarctic Station at Terranova Bay, Antarctica

Crystal system: Orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning:

Unit cell: a = 9.747, b = 23.88, c = 20.068

Colour: Colourless, bluish white

Diaphaneity: Transparent

Luster: Vitreous

Habit: Globular masses that flake off in lamellae, tabular crystal 0.2 by 0.6 by 0.7 mm

Hardness: 

Specific gravity: 2.13

Cleavage: 1; {010} distinct, parting on {001}

Tenacity: Brittle fracture

Streak: White

Synonyms/varieties:

Comments: