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Gaylussite

Na₂Ca(CO₃)₂,5H₂O

[Na⁺₂][Ca²⁺][(CO₃)₂]^4-,5H₂O

• Class: Carbonate
• Soluble in: Water (Slightly), HCl (with bubbles), HNO₃ (with bubbles), H₂SO₄ (with bubbles)
• Fluorescence: Long UV excitation (Pale blue)
• Dehydrate to powder, and it alters to Calcite by water.
• Substitution pseudomorph: Replaced by Calcite. (Glendonite)

• 5H₂O => 2H₂O: Pirssonite

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

• Cleavage: Perfect on {110} (2 planes), Indistinct on {001}
• Hardness: 2.5
• Density: 2.0

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=11.6, b=7.8, c=11.2, β=102.5