Tantalite

Refractive Index : 2.430 – 2.260

Optical Characteristic : DR, B+

Specific Gravity : 8.2 – 5.5

Formula : MnTa2O6

Crystal System : Orthorhombic

Variety/Species : All

Species/Group : Tantalite

Birefringence : 0.160

Dispersion : N/A

Hardness : 6 to 6.5

Toughness : poor

Ultrasonic : Never

Steam : Never

UV Long : Inert

UV Short : Inert

Pleochroism : 3 colors

Strength : weak to moderate

Pleochroism Colors : Strong: Brown/red-brown.

Heat : sensitive

Acids : sensitive

Light : stable

Polish Luster : submetallic

Fracture : Uneven

Fracture Luster :

Clarity Type : N/A

Tones : N/A

Saturations : N/A

Cause of Color :

Enhancements : none

Cleavage : distinct 1 direction.

Color Range : Black, brown blackish, brownish

Transparency : opaque

Phenomena : None

Separations : Tantalite from-

Identifying Characteristics and information
Brown streak

Spectral Data
not diagnostic.

Trade Names and Misnomers
Coltan
Columbite
Tantalite
Tantalum

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