Icosahedral system

Icosahedrite

https://www.mindat.org/system_search.php?c=Icosahedral

 

https://www.mindat.org/min-40647.html

Formula:

Al63Cu24Fe13

Colour:

dark grey-black

Lustre:

Metallic

Crystal System:

Icosahedral

Name:

Named for the icosahedral symmetry of its internal atomic arrangement, as observed in its diffraction pattern.

The first quasicrystal (http://en.wikipedia.org/wiki/Quasicrystal) described as a mineral species.

Chemically similar to ‘Unnamed (Al-Cu-Fe Alloy)’ and ‘Unnamed (Al-Cu-Fe Alloy II)’.

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