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Gemstones 250x250

The Mineral buergerite

Buergerite Crystals on Matrix

Buergerite is a rare member of the Tourmaline group. It was first discovered in 1966, and its locality was subsequently forgotten until the noted Mexican mineral collector Dr. Miguel Romero hired two exploration geologists to search and find the deposit. Subsequent finds have yielded very little material, and good specimens of this rare form of Tourmaline remain difficult to obtain. Buergerite is named in honor of Martin J. Buerger (1903-1986), a prominent mineralogist and professor of mineralogy at Massachusetts Institute of Technology.

Chemical Formula

NaFe2+3Al6(BO3)3Si6O18O3F

Color

Bronze-like dark yellowish brown to nearly black.

Crystal System

Hexagonal

Properties

Streak
White
Hardness
7 - 7.5
Transparency
Translucent to opaque.
Specific Gravity
3.3
Luster
Vitreous, submetallic, greasy
Cleavage
3,2
Fracture
Conchoidal to uneven
Tenacity
Brittle

Crystal Habits

Crystals are usually three sided prisms, and are usually short and stubby, though elongated crystals exist as well. Terminations can be both simple and complex, and growth layers are often present. Occurs in columnar aggregates and as dense agglomerated prisms.

3D Crystal Atlas

Additional Information

Composition
Sodium iron iron aluminum fluoro-boro-silicate
In Group
Silicates; Cyclosilicates; Tourmaline Group
Striking Features
Crystal habits, color, and locality.
Environment
In igneous rhyolite deposits.
Rock Type
Igneous

Other Names

Fluor-buergerite Fluor-buergerite is the IMA-recognized name of Buergerite since 2011. The renaming was due to recent analysis of fluorine present in the chemical structure of this mineral at the type locality. Most collectors still refer to this mineral as Buergerite, and have not adopted the new, lengthier name.

Uses

Buergerite, being a very rare form of Tourmaline, is an expensive and cherished collectors mineral.

Noteworthy Localities

The type locality of this mineral where all collectible specimens have come from is Mexquitic, in San Luis Potosí, Mexico. The chemical makeup of Buergerite suggests that it should be more globally distributed, and although subsequent localities have since been discovered, they have not produced any collectible specimens of interest.

Common Mineral Associations

Opal, Biotite, Feldspars

Distingushing Similar Minerals

Dravite - Does not occur in igneous rhyolite environments.

buergerite Photos



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