Fluor-buergerite

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Fluor-buergerite is a rare mineral belonging to the tourmaline group. It is a member of the elbaite subgroup and is characterized by its unique chemical composition and physical properties.

Chemical Composition

Fluor-buergerite has the chemical formula NaFe^3+_3Al_6(BO_3)_3Si_6O_18(O,OH,F)_4. It is distinguished from other tourmalines by the presence of significant amounts of fluorine (F) in its structure, replacing the hydroxyl group (OH).

Physical Properties

Fluor-buergerite typically forms in granite and pegmatite environments. It is known for its dark brown to black color, although it can also appear in shades of yellow-brown. The mineral has a hardness of 7 to 7.5, making it relatively hard and durable. Its crystal system is trigonal, and it often forms prismatic crystals.

Occurrence

Fluor-buergerite is primarily found in Mexico, particularly in the San Luis Potosí region. It is often associated with other minerals such as quartz, feldspar, and mica.

History and Etymology

The mineral was named in honor of the American mineralogist Martin J. Buerger, who made significant contributions to the field of crystallography. The prefix "fluor-" indicates the presence of fluorine in its composition.

Related Minerals

Fluor-buergerite is closely related to other members of the tourmaline group, including dravite, schorl, and elbaite. These minerals share a similar crystal structure but differ in their chemical compositions.

Uses

Due to its rarity, fluor-buergerite is primarily of interest to mineral collectors and researchers. It is not commonly used in jewelry or industrial applications.

See Also

• Tourmaline
• Elbaite
• Dravite
• Schorl
• Granite
• Pegmatite