Tantalite

Hardness ( Moh )

" 6-6.5

Crystal System

Orthorhombic

Specific Gravity

5.18 - 8.20

Refractive Index

2.260 - 2.430

Birefringence

Family

Colour(s)

Dark black, iron-black to dark brown, reddish brown

Cleavage

Francture Type

Subconchoidal

Luster

Streak

Brownish-red to black

Transparency

Opaque

Formula

(Fe,Mn)Ta2O6

Country

Found In Afghanistan,Algeria,Angola,Argentina,Australia,Austria,Bolivia,Brazil,Canada,China,Czech Republic,DR Congo,Egypt,Equatorial Guinea,Eswatini,Ethiopia,Finland,France,India,Italy,Ivory Coast,Kazakhstan,Kyrgyzstan,Madagascar,Malawi,Mauritania,Mozambique,Namibia,Nepal,Nigeria,Norway,Pakistan,Poland,Portugal,Russia,Rwanda,Saudi Arabia,Slovakia,Somalia,South Africa,Spain,Sri Lanka,Sweden,Thailand,Uganda,UK,Ukraine,USA,Zimbabwe