Revdite

Formula: Na₁₆[Si₄O₆(OH)₅]₂[Si₈O₁₅(OH)₆](OH)₁₀.28H₂O

Origin of name: after locality Revda, Murmansk district, Russia

Crystal system: monoclinic

Crystal class: 2

Twinning: 

Unit cell: a = 5.383, b = 9.972, c = 6.907, β = 96.78°

Colour: colourless

Diaphaneity: transparent

Luster: vitreous to pearly

Habit: irregular rounded masses, 1 to 2 cm diameter

Hardness: 2

Specific gravity: 1.94

Cleavage: 2; {100} and {010} perfect

Tenacity: 

Streak: white

Synonyms/varieties:

Comments: