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Brewsterite-Ba

Year of discovery: 1993 (Cerchiara mine, Italy; Valentine deposit, USA)

Locality list:

• BaAl₂Si₆O₁₆,5H₂O
• (Ba,Sr)Al₂Si₆O₁₆,5H₂O
• [Ba²⁺][(AlSi₃O₈)₂]^2-,5H₂O

• Class: Brewsterite group < Zeolite family
• Class: Tecto-Aluminosilicate - Zeolitic water
• Fluorescence: Short UV excitation (partly, Yellowish green)

• Ba => Sr: Brewsterite-Sr

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

• Cleavage: Perfect on {010} (1 plane)
• Hardness: 4 - 5
• Density: 2.5

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=6.8, b=17.6, c=7.7, β=94.5