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Mangano Tantalite

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Original price $250
Current price $200

A really dark red perfect Tantalite specimen with good termination.
It's a rare mineral.

Weight: 100 grams

Origin: Pech Valley. Kunar Afghanistan

Color: Dark Red


Dark red crystal of tantalite

 

 

Tantalite

The mineral group tantalite [(Fe, Mn)Ta2O6] is the primary source of the chemical element tantalum. It is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or "columbite-tantalite" in many mineral guides. However, tantalite has a much greater specific gravity than columbite (8.0+ compared to columbite's 5.2). Iron-rich tantalite is the mineral tantalite-(Fe) or ferrotantalite and manganese-rich is tantalite-(Mn) or manganotantalite Tantalite is also very close to tapiolite. Those minerals have same chemical composition, but different crystal symmetry orthorhombic for tantalite and tetragonal for tapiolite. Tantalite is black to brown in both color and streak. Manganese-rich tantalites can be brown and translucent. Tantalite occurs in granitic pegmatites that are rich in rare-earth elements, and in placer deposits derived from such rocks.[4] It has been found in Australia, Brazil, Canada, Colombia (Guainía and Vichada), Egypt, northern Europe, Madagascar, Namibia, Nigeria, Rwanda, The Democratic Republic of Congo, the United States (California, Colorado, Maine, and Virginia), and Zimbabwe. Brazil has the world's largest reserve of tantalite (52.1%).

 

General

Category

Oxide minerals

Formula
(repeating unit)

(Fe,Mn)Ta2O6

Strunz classification

4.DB.35

Crystal system

Orthorhombic

Crystal class

Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)

Identification

Color

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

Cleavage

Good in one direction

Fracture

Subconchoidal

Mohs scale hardness

6-6.5

Luster

Submetallic to almost resinous

Streak

Brownish-red to black

Specific gravity

8.0+