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Celsian (Photo) [abbr. Cls ]

Year of discovery: 1895 (Jakobsberg mine, Sweden), 1936 (Japan)

Locality list: 16 localities of celsiane

• BaAl₂Si₂O₈
• [Ba²⁺][Al₂Si₂O₈]^2-

• Class: Feldspar group
• Class: Tecto-Aluminosilicate
• Soluble in: HCl

• Polymorph: Paracelsian (Pseudo-orthorhombic)

• Ba => Ca: Anorthite, Dmisteinbergite, Svyatoslavite
• Ba => Sr: Slawsonite

• BaAl => (Na,K)Si: Anorthoclase
• BaAl => RbSi: Rubicline
• BaAl => NaSi: Albite, Kumdykolite, Lingunite
• BaAl => KSi: Orthoclase (Series), Microcline, Adularia, Sanidine

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

• Habit: Thick tabular

• Cleavage: Perfect on {001} (1 plane), Good on {010} (1 plane), Indistinct on {110} (2 planes)
• Hardness: 6-6.5
• Density: 3.3

• System: Monoclinic
• Group: 2/m, I2₁/c
• Lattice: a=8.6, b=13.1, c=14.4, β=115.2