Manganotantalite | Gemopedia

Manganotantalite is an intense red to reddish brown variety of tantalite with a high manganese and low iron composition. Prized for its exceptional dispersion, this mineral yields beautiful faceted gemstones, thanks in large part to its orthorhombic crystal structure. However, faceted gems are very limited in availability.
Alternate
Names
Tantanlite-(Mn)
Colors
Red

Manganotantalite Classification

Common Name

Manganotantalite

Species

Manganotantalite

Variety

Colors

Red

Alternate Names

Tantanlite-(Mn)

Gemstone Groups

Key Separations

OTL RI and high SG

Comments

Manganotantalite Optical Properties

Transparency

Transparent

Refractive Index

Over the Limit 2.19-2.34

Birefringence

0.015

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

Trichroic, strong red, brown, and orange

Dispersion

Strength: strong fire

Comments

Manganotantalite Chemistry & Crystallography

Chemical Name

manganese tantalum oxide

Chemical Formula

MnTa2O6

Synthesis

Crystal System

Orthorhombic

Classification

Oxide

Nature

Natural

Crystallinity

Crystalline

Comments

Manganotantalite Characteristic Physical Properties

Hardness

5.5-6.5

Streak

Dark Red

Specific Gravity

7.73-7.97

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Uneven, Subconchoidal

Cleavage

Good, in two directions

Comments

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