Photo: Kelly Nash · CC BY 3.0

An oxide mineral with the consisting of tantalum (Ta), niobium (Nb) and tin (Sn) and often found in granitic pegmatites.

Properties

Chemical formula

(Ta,Mn,Nb)O₂

Group

Oxides

Crystal system

Orthorhombic

Hardness (Mohs)

—

Color

Metallic

Luster

—

Streak

—

Density

—

Cleavage

—

Fracture

—

Tenacity

—

Crystal habit

—

Transparency

—

Space group

—

Fluorescence

—

Magnetism

—

Radioactivity

—

Refractive index

—

Optical character

—

Birefringence

—

Pleochroism

—

Strunz classification

4.DB.25

Dana classification

—

IMA status

Discredited mineral (D)

IMA symbol

—

Locality

🇫🇮 Kimito island

Type locality

—

Discovery year

—

Source: Wikidata