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Stevensite [abbr. Stv ]

Year of discovery: 1873 (Bergen Hill, USA), 1962 (Japan)

Locality list: 21 localities of stevensite

• (Ca,Na)_xMg₃Si₄O₁₀(OH)₂
• [Ca²⁺_x][Mg²⁺₃][(OH)₂|(Si₂O₅)₂]^6-

• Class: Trioctahedral < Smectite group < Mica supergroup
• Class: Phyllosilicate - Hydroxide
• May be a mixture of some minerals.

• Mg₃ => Al₂: Monmorillonite
• Mg₃ => Fe₂: Nontronite

• Color: White, Pale yellow
• Streak: White
• Luster: Waxy
• Diaphaneity: Translucent

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2.5
• Density: 2.5

• Habit: Fibrous
• Aggregate: Radial

• System: Monoclinic
• Lattice: a=5.3, b=9.1, c=15.3, β=90.0