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Ferrierite-K

Year of discovery: 1976 (Santa Monica mountains, USA), 2002 (Japan)

Locality list: 2 localities of ferrierite-K

• K₂Mg(Al,Si)₁₈O₃₆,9H₂O
• (K₂,Mg,Na₂)Mg(Si,Al)₁₈O₃₆,9H₂O
• [K⁺₂][Mg²⁺][(Al,Si)₁₈O₃₆]^4-,9H₂O

• Class: Ferrierite series < Mordenite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Radioactive: Very weak

• K₂ => Mg: Ferrierite-Mg
• K => Na: Ferrierite-Na

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {100} (1 plane), Imperfect on {001} (1 plane)
• Hardness: 3-3.5
• Density: 2.1

• System: Orthorhombic
• Group: mmm, Pnnm
• Lattice: a=19.0, b=14.1, c=7.5