Formula: (Li,Na)Mn4Si5O14(OH)
Origin of name: for M. Nambu, Japanese professor
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: reddish-brown with orange tint
Diaphaneity:
Luster: vitreous
Habit: crystals prismatic, to 8 mm
Hardness: 6.5
Specific gravity: 3.51
Cleavage: 3;{001} perfect, {100} and {010} distinct
Tenacity:
Streak: pale yellow
Synonyms/varieties:
Comments: series with natronambulite
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