Formula: (Na,Ca)2(Zr,Ti,Mn)2Si2O7(O,F)2
Origin of name: after locality Seidozero region, Kola Peninsula, Russia
Crystal system: monoclinic
Crystal class: 2/m or m
Twinning:
Unit cell:
Colour: brownish red to reddish yellow
Diaphaneity: translucent
Luster: vitreous
Habit: crystals prismatic, elongated on b-axis, in radiating groups, fibrous or spherulitic
Hardness: 4 to 5
Specific gravity: 3.47
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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