Formula: Na11(Na,Ca)4(Mg,Mn)Ti4(Si2O7)2(PO4)4O3F
Origin of name: for Vladimir Sobolev, Russian petrologist
Crystal system: triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: brown
Diaphaneity:
Luster: resinous
Habit: platy masses, to 5 mm
Hardness: 4.5 to 5
Specific gravity: 3.03
Cleavage: 2; {001} perfect, {110} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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