Cervantite is an antimony

Antimony

Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...

 oxide mineral

Oxide mineral

The oxide mineral class includes those minerals in which the oxide anion is bonded to one or more metal ions. The hydroxide bearing minerals are typically included in the oxide class...

 with formula Sb³⁺Sb⁵⁺O₄ (antimony tetroxide

Antimony tetroxide

Antimony tetroxide is an inorganic compound with the formula Sb2O4. This material, which exists as the mineral cervantite, is white but reversibly yellows upon heating...

).

It was first described in 1850 for an occurrence in Cervantes

Cervantes

-People:*Alfonso J. Cervantes , mayor of St. Louis, Missouri*Francisco Cervantes de Salazar, 16th-century man of letters*Ignacio Cervantes, Cuban composer*Jorge Cervantes, a world-renowned expert on indoor, outdoor, and greenhouse cannabis cultivation...

, Sierra de Ancares

Sierra de Ancares

The Serra dos Ancares is a mountain range in north-west Spain, extending in a south-westerly direction from the western end of the Cantabrian Mountains in Asturias....

, Lugo

Lugo

Lugo is a city in northwestern Spain, in the autonomous community of Galicia. It is the capital of the province of Lugo. The municipality had a population of 97,635 in 2010, which makes is the fourth most populated city in Galicia.-Population:...

, Galicia, Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

, and named for the locality. The mineral was questioned and disapproved, but re-approved and verified in 1962 based on material from the Zajaca-Stolice district, Brasina

Brasina

Brasina is a village in Serbia. It is situated in the Mali Zvornik municipality, in the Mačva District of Central Serbia. The village has a Serb ethnic majority with a population of 1,663 .-Historical population:*1948: 953...

, Serbia

Serbia

Serbia , officially the Republic of Serbia , is a landlocked country located at the crossroads of Central and Southeast Europe, covering the southern part of the Carpathian basin and the central part of the Balkans...

. It occurs as a secondary alteration product of antimony bearing minerals, mainly stibnite

Stibnite

Stibnite, sometimes called antimonite, is a sulfide mineral with the formula Sb2S3. This soft grey material crystallizes in an orthorhombic space group. It is the most important source for the metalloid antimony...

.