Schreibersite

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Schreibersite, also gloss iron, is a rarely occurring mineral from the mineral class of elements. It crystallizes in the tetragonal crystal system with the chemical composition (Fe, Ni, Cr) 3P and developed mostly small, platy, tabular or columnar to acicular crystals of silver-white color that quickly tarnish bronze yellow in air.

The values ​​given in the chemical formula in parentheses elements iron, nickel and chromium may be represented in any way in, but always in the same proportion to the phosphorus.

Etymology and history

Schreibersite was discovered and described in 1847 by Adolf Patera ( 1819-1894 ), an Austrian mining scientists and chemists, who named the mineral and in honor of the Austrian scientist Karl Franz Anton von writer.

Type material of the mineral is stored in the Natural History Museum in Vienna.

Classification

In the now outdated but still in use 8th edition of the mineral classification by Strunz the schreibersite belonged to the mineral class of " elements " and then to the Department of " metals, alloys and intermetallic compounds ", where he, along with Allabogdanit, Andreyivanovit, Barringerit, Florenskyit Melliniit nickel phosphide and the unnamed group I/A.11 formed.

The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the schreibersite also in the class of " elements " and there in the department of " Metallic carbon, nitrogen and phosphorus compounds " a. This division, however, is further subdivided by the type of connection, so that the mineral is found according to its composition in the subdivision of " phosphide ", where it forms the unnamed group 1.BD.05 together with nickel phosphide.

The mainly common in English-speaking classification of minerals according to Dana assigns the schreibersite in the class of " elements " and then in the same department. Here he is with Barringerit, nickel phosphide, Allabogdanit, Melliniit and Monipit in the " Barringeritgruppe, phosphides " with the system no. 01:01:21 within the sub-division of " elements: metallic elements other than the platinum group " to find.

Education and Locations

Schreibersite is a meteorite minerals which do not occur primarily on the earth. Because of the oxidizing conditions on the Earth's surface and in the crust are iron and phosphorus before only oxidically. Contrast, can be formed on the atmosphere-less bodies of iron meteorites iron phosphide mother. The crystals are present in these meteorites tabular ago in a matrix of minerals kamacite and taenite.

In Ovifak in Greenland there is a secondary occurrence of metallic iron and schreibersite. It originated during penetration hot magma rock in coal seams.

Locations for meteoritic schreibersite include those found in the Antarctic meteorite Allan Hills 77283 Moon and Allan Hills 84008, the Campo del Cielo meteorite in Argentina, the Indarch meteorite in Azerbaijan.

Crystal structure

Schreibersite crystallized tetragonal space group I4 with the lattice parameters a = 9.04 Å and c = 4.46 Å, and eight formula units per unit cell.