Tantalum is found in the minerals tantalite and pyrochlore. Mixtures of columbite and tantalite are called coltan. Tantalum is mined at the Kenticha Tantalite mining. Tapiolite is very close to "columbite" and "tantalite". Association minerals include&colon; albite, lepidolite, topaz, beryl, tourmaline, spessartine, tantalite and fluorite. These included euxenite, ilmenite, monazite, niobite, and tantalite. In 2006, 75% of world tantalite production came from Australia. Several steps are involved in the extraction of tantalum from tantalite. Minerals found in the FCT include marble, tin, clay, mica, and tantalite. The mineral group tantalite [(Fe, Mn)TaO] is the primary source of the chemical element tantalum. Columbite has the same composition and crystal symmetry (orthorhombic) as tantalite. Brazil has the world's largest reserve of tantalite (52.1%). Columbite and tantalite are collectively known as coltan in Africa. Tantalite and columbite are both associated with the tin ore in the plateau. The mining of tantalite causes many environmental and social problems in Democratic Republic of Congo.