Coronadite is the

lead Lead () is a chemical element; it has Chemical symbol, symbol Pb (from Latin ) and atomic number 82. It is a Heavy metal (elements), heavy metal that is density, denser than most common materials. Lead is Mohs scale, soft and Ductility, malleabl ...

endmember An endmember (also end-member or end member) in mineralogy is a mineral that is at the extreme end of a mineral series in terms of purity of its chemical composition. Minerals often can be described as solid solutions with varying compositions of ...

of the coronadite group, a family of tectomanganates with a 2 × 2 tunnel structure. The mineral was named after

Francisco Vasquez de Coronado Francisco is the Spanish and Portuguese form of the masculine given name ''Franciscus''. Meaning of the name Francisco In Spanish, people with the name Francisco are sometimes nicknamed " Paco". San Francisco de Asís was known as ''Pater Comm ...

who was an explorer of southwest US. The name was made up by

Waldemar Lindgren Waldemar Lindgren (February 14, 1860 – November 3, 1939) was a Swedish-American geologist and a founder of modern economic geology. Life Lindgren was born in Vassmolösa, Kalmar Municipality, Småland, Sweden, the son of Johan and Emma Lindg ...

in 1905. It is chemically related to ferricoronadite, an analogue, as well as cryptomelane,

hollandite Hollandite (chemical formula: Ba(Mn4+6Mn3+2)O16) is a manganese oxide mineral. Its structure consists of double chains of MnO6 octahedra delimiting 2 × 2 tunnels. The electrostatic charge created by the Mn3+ for Mn4+ substitution is balanced by ...

, manjiroite and strontiomelane. File:Hollandite.jpg, Polyhedral representation of the 2 × 2 tunnel structure of coronadite. The black atoms represent Pb.

References

{{Reflist Manganese minerals Lead minerals Minerals described in 1904