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Celestine [abbr. Clt ]

Year of discovery: 1791 (Bell's Mill, USA), 1957 (Japan)

Locality list: 8 localities of celestine

• SrSO₄
• [Sr²⁺][SO₄]^2-

• Class: Baryte group
• Class: Sulfate
• Soluble in: Water (Slightly), hot HCl (Slowly), hot HNO₃ (Slowly), hot H₂SO₄ (Slowly), NaHCO₃ (Slowly)
• Insoluble in: HCl
• Fluorescence: UV excitation (Pale blue-Green-Yellow), Phosphorescence (Blue-Green), Thermoluminescence
• Alters to Strontianite.
• Formed by alteration of Strontianite.

• Sr => Ba: Baryte (Series)
• Sr => Pb: Anglesite
• Sr => Ca: Anhydrite

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

• Habit: Platy
• Aggregate: Radial, Columnar

• Cleavage: Perfect on {001} (1 plane), Good on {210} (2 planes), Indistinct on {010} (1 plane)
• Hardness: 3-3.5
• Density: 4.0

• System: Orthorhombic
• Group: mmm, Pnma
• Lattice: a=8.4, b=5.4, c=6.9

Synonym: Celestite