Formula: Pb(Ti,Fe,Mn)21O38
Origin of name: for J. da Costa Sena, Brazilian mineralogist
Crystal system: hexagonal
Crystal class: -3
Twinning:
Unit cell:
Colour: black
Diaphaneity: opaque
Luster: submetallic
Habit: crystals rough, rounded fragments
Hardness: 6
Specific gravity: 5.301
Cleavage: none
Tenacity:
Streak: brownish black
Synonyms/varieties:
Comments:
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