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Bassanite

Year of discovery: 1910 (Monte Vesuvius, Italy), 1977 (Japan)

Locality list: 4 localities of bassanite

• CaSO₄,0.5H₂O
• [Ca²⁺][SO₄]^2-,0.5H₂O

• Class: Sulfate - Hydrate
• Hydrate to Gypsum under humid condition.
• Substitution pseudomorph: Replace Gypsum

• 0.5H₂O => H₂O: Anhydrite
• 0.5H₂O => 2H₂O: Gypsum

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

• Habit: Truncated Prismatic

• Density: 2.7

• System: Monoclinic
• Group: 2, I2
• Lattice: a=12.0, b=6.9, c=12.7, β=90.3