Formula: (K,Na)3(Mn,Fe)7(Ti,Nb)2Si8O24(O,OH)7
Origin of name: For B. and E. Kupletski, Russian geologists
Crystal system: Triclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Dark brown to black
Diaphaneity:
Luster: Vitreous
Habit: Platy forming lamellar masses; fine plates
Hardness: ~ 3
Specific gravity: 3.20 to 3.23
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with astrophyllite and with cesium kupletskite
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