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A brownish-white ore containing Mercurous chloride. Calomel is also used to refer to pure mercurous chloride. It has been used as a Fungicide, Insecticide, and topical anesthetic. One Peruvian cabinet decorated with mopa-mopa, was found to contain calomel as a white pigment (Newman 2017).

Synonyms and Related Terms

mercurous chloride; mercury subchloride; mercury monochloride; mercury protochloride; precipité blanc; Calogreen; Cyclosan, M-C Turf fungicide; calomel (Fr.); calomelano (Esp., Port.); Calomel (Deut.)

Chemical structure


Other Properties

Tabular crystals or mass. Cleavage = good in one direction. Luster = adamantine

Composition Hg2Cl2
CAS 10112-91-1
Mohs Hardness 1.5
Density 7.15
Molecular Weight mol. wt. = 472.09
Refractive Index 1.9-2.0; 2.6-2.7

Hazards and Safety

Toxic by ingestion, inhalation and skin absorption.

LINK: International Chemical Safety Card

Sources Checked for Data in Record

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5957
  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 200
  • The American Heritage Dictionary or Encarta, via Microsoft Bookshelf 98, Microsoft Corp., 1998
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

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