Coccinite
Encyclopedia
Coccinite is an extremely rare mineral. Its chemical formula is HgI2, mercury(II) iodide
Mercury(II) iodide
Mercury iodide is a chemical compound with an appearance of red-orange crystals. Unlike mercury chloride it is hardly soluble in water Mercury(II) iodide (HgI2) is a chemical compound with an appearance of red-orange crystals. Unlike mercury(II) chloride it is hardly soluble in water Mercury(II)...

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Discovery

The discovery was announced by del Rio in the journal of the Mexico city
Mexico City
Mexico City is the Federal District , capital of Mexico and seat of the federal powers of the Mexican Union. It is a federal entity within Mexico which is not part of any one of the 31 Mexican states but belongs to the federation as a whole...

 School of Mining. The news spread by reading that journal and a direct letters of del Rio. In the subsequent years several times the discovery was mentioned.
One of the earliest notes of the discovery is a translation of a letter of del Rio to Freiesleben in
In 1839 it was described as lemon coloured spots in the sandstone of Casas Vijecas. This description was also given in a Spanish book printed in 1844. In 1836 a short paper was published in Comptes rendus which was the communication of Yniestra to Arago about a discovery of del Rio. In this publication the mineral sample was deposited at the school of mines by a Mr. Jose Casas Viejas from the Querétaro province and that the mineral had a red brown colour. In 1861 the book A glossary of mineralogy by Henry William Bristow states that it has been found in Casas Viejas in Mexico as reddish brown particles on mercury selenide. Shortly after in 1862 a book about chemical technology gives the only location where the mineral can be found with a Mexican region Cavas Viejas.

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