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Stellerite

Year of discovery: 1909 (Mednyi island, Russia), 1979 (Japan)

Locality list: 9 localities of stellerite

• CaAl₂Si₇O₁₈,7H₂O
• [Ca²⁺][Al₂Si₇O₁₈]^2-,7H₂O

• Class: Heulandite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water

• Ca => Na₂: Barrerite

• Si => NaAl: Stilbite-Ca

• 7H₂O => 7.5H₂O: Erionite-Ca

• Color: Colorless, White
• Streak: White
• Luster: Pearly
• Diaphaneity: Transparent

• Habit: Platy
• Aggregate: Radial

• Cleavage: Perfect on {010} (1 plane), Imperfect on {100} and {001}
• Hardness: 4.5
• Density: 2.1

• System: Orthorhombic
• Group: mmm, Fmmm
• Lattice: a=13.6, b=18.2, c=17.7