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Londonite is a very rare mineral that was first discovered in the 1960s in the Mogok region of Myanmar. It is a type of mineral that is categorized as a mineral series, meaning that it is chemically and structurally similar to other minerals but contains slight variations.

Londonite belongs to the columbite-tantalite mineral group and is composed of several elements, including calcium, manganese, niobium, tantalum, and tin. Its chemical formula is Ca(Mn,Sn,Ta,Nb)_2O_6, and it is characterized by its brown to black color and high luster.

Due to its rarity and unique composition, Londonite is highly prized by mineral collectors and researchers. It is often used in scientific studies to understand the geological history of the areas where it is found, and its properties are also of interest to the electronics industry due to its potential use in the production of high-tech components.

Londonite has only been found in a few locations around the world, including Myanmar, Brazil, and Madagascar. Its scarcity and limited availability make it a highly valued and sought-after mineral by collectors and enthusiasts alike.