Formula: K4Mn48(Si,Al)72(O,OH)216 . nH2O
Origin of name: From locality; Franklin NJ and Greek for friend
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Dark brown
Diaphaneity: Transparent to translucent
Luster: Vitreous to resinous
Habit: Platy crystals in radial aggregates
Hardness: 4
Specific gravity: 2.6 to 2.8
Cleavage: None
Tenacity:
Streak: Light brown
Synonyms/varieties:
Comments: Manganese analogue of stilpnomelane
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