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Calomel

Year of discovery: 1776 (Landsberg (Moschellandsberg), Germany), 1941 (Japan)

Locality list: 2 localities of calomel

• Hg₂Cl₂
• [Hg⁺₂][Cl₂]^2-

• Class: Chloride
• Soluble: Turns black by NH₃aq.
• Insoluble in: HCl
• Fluorescence: UV excitation (Dark red)
• Lightfastness: Photodissociates to HgCl₂ and Mercury.

• Hg => Na: Halite
• Hg => K: Sylvite
• Hg => Ag: Chloraragyrite
• Hg => Cu: Nantokite
• Hg => NH₄: Salammoniac
• Hg => Tl: Lafossaite

• Cl => Br: Kuzminite (Series)
• Cl => I: Moschelite

• Color: Colorless-Pale brown
• Streak: Pale yellow
• Luster: Adamantine
• Diaphaneity: Transparent

• Cleavage: Distinct on {110} (2 planes), Imperfect on {011} (4 planes)
• Hardness: 1.5-2
• Density: 7.2

• System: Tetragonal
• Group: 4/mmm, I4/mmm
• Lattice: a=4.5, c=10.9