Taenite

A variety of Minerals

Taenite specimen - rock identification

What is Taenite?

Taenite (Fe,Ni) is a mineral found naturally on Earth mostly in iron meteorites. It is an alloy of iron and nickel, with nickel proportions of 20% up to 65%. The name is derived from the Greek ταινία for "band, ribbon". Taenite is a major constituent of iron meteorites. In octahedrites it is found in bands interleaving with kamacite forming Widmanstätten patterns, whereas in ataxites it is the dominant constituent. In octahedrites a fine intermixture with kamacite can occur, which is called plessite. Taenite is one of four known Fe-Ni meteorite minerals: The others are kamacite, tetrataenite, and antitaenite.

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Taenite Localities Map

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North ZoneCentral RidgeSouth Basin

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Key Characteristics

Characteristics of Taenite

It is opaque with a metallic grayish to white color. The structure is isometric-hexoctahedral. Its density is around 8 g/cm and hardness is 5 to 5.5 on the Mohs scale. Taenite is magnetic, in contrast to antitaenite. The crystal lattice has the c≈a= 3.582±0.002 Å. The Strunz classification is I/A.08-20, while the Dana classification is 1.1.11.2 . It is hexoctahedral (cubic) in structure.

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Taenite specimen 2
© Waifer X

Quick Facts

Physical Properties

Color
Greyish white, silver-white
Hardness (Mohs)
5 - 5.5
Streak
Light grey

Chemical Properties

Chemical Formula
(Fe,Ni)
Elements
Fe, Ni

Also Known As

TaeniteEdmonsoniteTaenite (of Reichenbach)
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