Hackmanite

Formula: Na₈Al₆Si₆O₂₄(Cl₂,S) (Sodalite variety)
Mineral class: silicates
Crystal system: cubic
Mohs scale: 5 - 6
Density (g/cm³): 2.27 - 2.33
Refractive index: 1.483 - 1.487
Colors: colorless, rose, violet, blue, depending on the deposit and lighting. Tenebrescent.
Luster: vitreous
Fluorescence: LW UV: orange, SW UV: rose-violet
Pleochroism: -
Largest Hackmanite: 8 cm?
Deposits: Afghanistan, Canada, Greenland, Guinea, Myanmar, Russia, USA
Name: in honor of the Finnish geologist Victor Axel Hackman (1866 - 1941)

Hackmanite

Origin: Afghanistan

Photo by kind permission of © www.irocks.com

Hackmanite SW UV Fluorescence

Size: 0.69 x 0.53 cm
Weight: 0.82 ct
Origin: Poudrette Quarry / Mount Saint-Hilaire / Rouville County / Québec / Canada

Photo by kind permission of © www.thegemtrader.com

Hackmanite Mineral

Origin: Kiran / Kokcha Valley / Badakhshan / Afghanistan

Photo by kind permission of © www.irocks.com

Hackmanite

Weight: 0.84 ct

Origin: Pein Gyi Mine / Pein Pyit / Mogok / Myanmar

Photo by kind permission of © www.crystal-treasure.com

Hackmanite

Weight: 0.27 ct
Size: 0.6 x 0.3 cm
Origin: Canada

Photo by kind permission of © www.kox-gems.com

Hackmanite Mineral

Origin: Kiran / Kokcha Valley / Badakhshan / Afghanistan

Photo by kind permission of © www.kqminerals.com

Hackmanite LW UV Fluorescence

Weight: 7.87 ct

Origin: Afghanistan

Photo: Mia Dixon, by kind permission of © www.palagems.com

Hackmanite

Weight: 0.79 ct
Size: 1.03 x 0.58 x 0.27 cm
Origin: Afghanistan

Photo by kind permission of © www.ridderborg.se

Hackmanite

Weight: 2.56 ct
Size: 1.32 x 0.89 x 0.44 cm
Origin: Afghanistan

Photo by kind permission of © www.ridderborg.se

Hackmanite

Weight: 0.61 ct
Size: 0.85 x 0.49 x 0.33 cm
Origin: Afghanistan

Photo by kind permission of © www.ridderborg.se

Hackmanite tenebrescent

Weight: 2.06 ct

Origin: Afghanistan

Photo by kind permission of © www.americanthai.com

Hackmanite tenebrescent

Weight: 0.48 ct

Origin: Afghanistan

Photo by kind permission of © www.americanthai.com

Hackmanite tenebrescent

Size: 0.50 x 0.38 cm
Weight: 0.23 ct
Origin: Mogok Area / Myanmar

Photo by kind permission of © www.americanthai.com

Hackmanite tenebrescent

Size: 0.64 x 0.41 cm
Weight: 0.41 ct
Origin: Mogok Area / Myanmar

Photo by kind permission of © www.americanthai.com

Hackmanite tenebrescent

Weight: 6.22 ct

Origin: Pein Gyi Mine / Pein Pyit / Mogok / Myanmar

Photo by kind permission of © www.crystal-treasure.com

Hackmanite tenebrescent
Left: Daylight, right: Blacklight blue lamp

Weight: 1.76 ct
Origin: Myanmar

Photo by kind permission of © www.multicolour.com