Mottramite is a rare mineral that belongs to the lead oxide group. Its name is derived from the locality of its discovery, Mottram St Andrew, Cheshire, England. The correct spelling of mottramite is [mɒtˈɹæmaɪt]. The first syllable, "mot," is pronounced with a short "o" sound, followed by the "t" consonant. The second syllable, "tram," is pronounced with a short "a" sound and ends with the "m" consonant. Lastly, the third syllable, "ite," is pronounced with a long "i" sound and ends with the "t" consonant.
Mottramite is a mineral belonging to the vanadate class and having the chemical formula PbCu(VO4)(OH). It is a secondary mineral formed through the oxidation of primary ore minerals containing lead and copper. The name "mottramite" originates from the Mottram St. Andrew region in Cheshire, England, where it was discovered in the 19th century.
Mottramite occurs as small, prismatic crystals or granular aggregates, commonly in the form of crusts or coatings on rock surfaces. Its color ranges from bright green to black, occasionally with a yellow or brown tint. It has a vitreous to adamantine luster and typically exhibits a subconchoidal fracture. The mineral is translucent to opaque.
Mottramite is characterized by its unique chemical composition and crystal structure. It forms in oxidized environments such as the oxidized zones of lead and copper deposits. It commonly occurs alongside other secondary minerals such as malachite, azurite, and pyromorphite.
Due to its striking color and aesthetic appeal, mottramite is highly sought after by mineral collectors. However, it is relatively rare and not commonly found in large quantities. Its occurrence in deposits worldwide is limited, and notable occurrences include Australia, Namibia, Mexico, and the United States.
In addition to its use as a collector's mineral, mottramite does not have any significant industrial applications. Its main value lies in its beauty and rarity, making it a coveted specimen for mineral enthusiasts and collectors.
The word "mottramite" derives from Thomas Mottram, an English chemist and mineralogist who discovered the mineral in 1823. The suffix "-ite" in mineralogy refers to minerals, making "mottramite" the mineral discovered by Thomas Mottram.