Formula: (Na,K)2(Ba,CaSr)2(Ti,Fe)3(SiO4)4(O,OH)2
Origin of name: From Barium and lamprophyllite
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 19.833 Å, b = 7.089 Å, c = 5.393 Å, b = 96.66°
Colour: Dark brown
Diaphaneity: Semitransparent
Luster: Vitreous
Habit: Aggregates of cleavage pseudorhombs
Hardness: 2 to 3
Specific gravity: 3.62 to 3.66
Cleavage: 3; {100} perfect, {011} good, {010} imperfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments: Found in ijolite
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