Formula: K9Na(Ca,Sr)Al12Si24O72.15H2O
Origin of name: for Lilia Perekrest, Russian mineralogist
Crystal system: hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell:
Colour: white
Diaphaneity:
Luster: pearly
Habit: radiating fibrous aggregates to 2 cm
Hardness: 4 to 6
Specific gravity: 2.14
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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