Formula: (Na,Ca,K)9(Si,Al)12O24{(OH)2,SO4,CO3,Cl2]3.nH2O
Origin of name: after locality Sacrofano volcanic area, Italy
Crystal system: hexagonal
Crystal class: -6m2
Twinning:
Unit cell: a = 12.865, c = 72.24
Colour: colourless
Diaphaneity: transparent
Luster: pearly
Habit: flattened hexagonal prisms
Hardness: 5.5 to 6
Specific gravity: 2.423
Cleavage: 2; {0001} and {0-110} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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