Chivruaiite

Formula: Ca₃Ti₅[Si₆O₁₇)₂O(OH)₄] 14H₂O

Origin of name: For the type locality, the Chivruai River Valley, Lovozero Massif, Kola Peninsula, Russia

Crystal system: Orthorhombic

Crystal class: 2/m 2/m 2/m

Twinning: 

Unit cell: a = 7.17, b = 22.98, c = 6.94

Colour: Pale pink to colourless, tan

Diaphaneity: Vitreous

Luster: Transparent

Habit: 

Hardness: 3

Specific gravity: 2.4

Cleavage: {100} and {010} distinct/good

Tenacity: Step-like fracture

Streak: White

Synonyms/varieties:

Comments:  Closely related to haineaultite. Calcium analog of zorite.