Microlite

Microlite-bem-42a

Microlite refers to a group of minerals within the pyrochlore supergroup, which are oxide minerals with the general formula (Ca,Na)_2Ta_2O_6(O,OH,F). Microlite is characterized by its high tantalum content and is an important ore of this metal. The mineral is typically found in pegmatites associated with granite, and its formation is linked to the late stages of the crystallization process of these intrusive rocks.

Properties

Microlite is known for its isotropic properties, exhibiting a range of colors from yellow to green, depending on its composition. The mineral has a Mohs hardness of 5 to 5.5, making it relatively hard but still susceptible to scratching by harder substances. Its specific gravity ranges from 4.2 to 6.3, which is high, reflecting its dense nature. Microlite crystals are usually small, hence the name, which is derived from the Greek for "small" and "stone."

Occurrence

Microlite is primarily found in pegmatites, which are coarse-grained igneous rocks. These pegmatites form during the final stages of magma crystallization and are known for containing rare minerals, including microlite. The mineral is often associated with other tantalum and niobium minerals, such as columbite and tantalite, and can also be found alongside quartz, feldspar, and mica.

Uses

The primary use of microlite is as a source of tantalum, a metal highly valued for its use in electronic components, such as capacitors and high-power resistors in mobile phones, DVD players, video game systems, and computers. Tantalum's high melting point and resistance to corrosion also make it useful in the manufacturing of aircraft engines, missile parts, and nuclear reactors.

Environmental and Ethical Concerns

The mining of tantalum ores, including microlite, has been linked to environmental degradation and ethical issues, particularly in conflict regions. The extraction process can lead to deforestation, soil erosion, and contamination of water sources. Furthermore, in some areas, the tantalum mining industry has been associated with funding armed conflict and violating human rights, leading to calls for the ethical sourcing of tantalum and other minerals.

See Also

• Pyrochlore
• Pegmatite
• Tantalum
• Mineralogy

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