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Cadmia



In alchemy, cadmia (Latin for calamine), is an oxide of zinc (tutty) which collects on the sides of furnaces where copper or brass was smelted, and zinc sublimed. The term is also applied to an ore of cobalt.

Additional recommended knowledge

For the cadmia produced in furnaces, there were five identified kinds: the first called botrytis, as being in the form of a bunch of grapes; the second, ostracitis, as resembling a sea shell; the third, placitis, for resembling a crust; the fourth, capnitis; and the fifth, calamitis, which hung around certain iron rods that were used to stir material in the furnace; being shaken off, the cadmia resembled the figure of a quill, called in the Latin, calamus. The cadmia botrytis was found in the middle of the furnace; the ostrytis at the bottom; the placitis at the top; and the capnitis at the mouth of the furnace.

In pre-modern medicine, cadmia was used as a desiccative and detersive, in moist stinking ulcers, causing the area to become healed by the formation of scar tissue. The botrytis and placitis were also used for diseases of the eyes.

The term cadmia was formerly applied to the mineral calamine, or lapis calaminaris.

References

  1. Webster's Revised Unabridged Dictionary (1913)
  2. This article incorporates content from the 1728 Cyclopaedia, a publication in the public domain.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Cadmia". A list of authors is available in Wikipedia.
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