Tourmaline • Elbaite (Tourmaline Group)

Indicolite Tourmaline

Deep indigo blue, teal lagoon blue, to oceanic greenish-blue.

Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ + Fe²⁺Mohs 7.0 – 7.5 Mohs

Mineralogical & Gemological Profile

Mineral Family	Tourmaline
Mineral Species	Elbaite (Tourmaline Group)
Gemological Variety	Indicolite (Blue Tourmaline)
Chemical Composition	`Na(Li,Al)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄ + Fe²⁺`
Crystal System	Trigonal
Mohs Hardness	7.0 – 7.5 Mohs
Specific Gravity	3.02 – 3.26
Refractive Index	1.624 – 1.644

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Color Characteristics & Optical Behavior

Deep indigo blue, teal lagoon blue, to oceanic greenish-blue.

Geological Context & Pakistani / Global Localities

Recovered from high-altitude miarolitic pegmatites in Pakistan (Shigar, Stak Nala, Astor), Afghanistan (Pech/Paprok), Brazil, and Namibia.

Collector Interest & Rarity Factors

Open-axis teal and neon-lagoon indicolites from the Hindu Kush and Karakoram mountains are among the most coveted collector tourmalines.

Fine Jewelry Applications

Emerald-cut and oval-cut rings, pendants, and custom stud earrings.

Treatment Considerations & Disclosure

Often natural, though gentle heat treatment is sometimes applied to lighten overly dark blue crystals.

Care & Cleaning Instructions

Wash gently in warm soapy water; avoid sudden temperature changes.

Traditional Meaning

Traditional Symbolism & Cultural Heritage

Associated with deep tranquility, articulate thought, and contemplation. October birthstone.

Note: Cultural and birthstone traditions are presented strictly as historical folklore, never as scientifically verified medical or metaphysical effects.

Tourmaline