Formula: (Na,K)4Ca(Al6Si10)O32 . 12H2O
Origin of name: After locality; south of Gobbins area, Magee Island, Northern Ireland
Crystal system: Orthorhombic pseudotetragonal
Crystal class: mm2 or 422
Twinning:
Unit cell:
Colour: White
Diaphaneity:
Luster:
Habit: Crystals lath-shaped, fibrous, in clusters
Hardness: 4
Specific gravity: 2.15
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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