Raite

Formula: Na₄Mn₄Si₈(O,OH)₂₄.9H₂O

Origin of name: for crew members of Ra, Thor Heyerdahl's papyrus boat

Crystal system: Monoclinic

Crystal class: 2/m

Twinning:

Unit cell: a = 15.1, b = 17.6, c = 5.29, β = 100.05°

Colour: gold to brown, violet red

Diaphaneity: 

Luster: vitreous, sometimes silky

Habit: crystals acicular, to 2 mm

Hardness: 3

Specific gravity: 2.39

Cleavage: 3; {100}, {010} and {001} perfect

Tenacity: Brittle

Streak: yellow

Synonyms/varieties:

Comments: