Black Tourmaline

Size: 2.5x8.5 cms

Weight: 34 grams

Location: Gon Mine, Shigar, PK

Product Description:

A striking mineral specimen featuring black tourmaline, a boron silicate mineral, showcasing a dense, opaque crystal formation with a sleek, vitreous luster.

Geological Information:

- Location: Gon Mine, Shigar Valley, Gilgit-Baltistan, Pakistan
- Type: Black Tourmaline (Boron Silicate, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
- Formation: Pegmatitic and hydrothermal veins in granitic and metamorphic rocks
- Color: Black to dark brown
- Hardness: 7-7.5 on the Mohs scale
- Crystal System: Trigonal
- Formation Process: Magmatic and hydrothermal activity resulted in the formation of black tourmaline.
- Age: Cretaceous-Paleogene Era, approximately 145-25 million years old
- Occurrence: Found in limited quantities, primarily in the Shigar Valley, Gilgit-Baltistan region of Pakistan.
- Distinctive Features: Prismatic crystals with a smooth, vitreous luster, often associated with quartz, feldspar, and mica minerals.

This detailed description highlights the natural beauty, unique features, and geological significance of Black Tourmaline from Gon Mine, Shigar, Pakistan, showcasing its rarity and mineralogical importance.