Magnesioferrite

Magnesioferrit (also Magnoferrit or Magneferrit ) is a rarely occurring mineral from the mineral class of " oxides and hydroxides ". It crystallizes in a cubic crystal system having a chemical composition MgFe23 O4 and usually develops to massive granular mineral aggregates, as well as octahedral crystals and contact twins after Spinellgesetz to about 5 mm in size of a metallic gloss, black to brown black color.

Magnesioferrit forms a mixed batch with magnetite.

Etymology and history

Was first found Magnesioferrit 1859 at Vesuvius in Italy and described by Karl Friedrich Rammelsberg, of the minerals by its main components magnesium and iron (Latin ferrum ) named.

Classification

In the old ( 8th edition ) and new classification of minerals according to Strunz ( 9th edition ) of the Magnesioferrit belongs to the Department of " oxides and hydroxides with the molar ratio of metal: oxygen = 3: 4 ( and similar ) ". The 9th edition of Strunz'schen systematics divided here but now more specific on the size of the cations involved, and the mineral is "With only medium-sized cations " to find accordingly in the subdivision.

The classification of minerals according to Dana assigns the Magnesioferrit also in the class of oxides, there, however, in the department of " multiple oxides ( A B2 ) 2X4, spinel group " where he along with Jakobsit, magnetite, Franklinite, Trevorit, Cuprospinell and Brunogeierit the iron subgroup forms.

Education and Locations

Most Magnesioferrit forms on fumaroles or metamorphic at burn-off of marl and coal stockpiles. As an ancillary component of some kimberlites, carbonatites and alkaline gabbros, it is also to be found. Accompanying minerals include hematite, titanomagnetite (variety of magnetite) and mostly ferrous Diopside.

So far Magnesioferrit was at about 30 localities (as of 2010) are detected: in the district of Alto Chapare ( province of Chapare ) in Bolivia; in " Sanpo ore field " of the district Suixi in China; in the slag field at Lapanouse -de- Sévérac in the French department of Aveyron; on Orberg and Badberg the Emperor chair ( Baden- Württemberg), with the calibration ( Andernach ) and at Ettringer Bellerberg in the Eifel and Ronneburg ( Thuringia) in Germany; in the " Hatrurim formation" of the Israeli Negev desert; in some regions of Campania, Lazio and Sicily in Italy; in the province Shiribeshi on Hokkaidō in Japan; in the " Willem Sophia mine " in Kerkrade, the Netherlands; in the Dypingdaler serpentine - magnesite deposit at Snarum ( municipality Modum ) in Norway; Spittal an der Drau the Milstätter See ( Carinthia ) and church village in the municipality Pernegg an der Mur (Styria ) in Austria; at Zawiercie ( Upper Silesia ) in Poland; in the iron ore deposit at Zheleznogorsk - Ilimski in Dalnegorsk, in the former Soviet Autonomous Republic of Kabardino -Balkaria and Kopeisk in Russia; at Vechec in Slovakia; at Želénky ( to Duchcov, Bohemia ) in the Czech Republic as well as in several regions of California, Idaho, New Mexico, South Carolina, Utah, Virginia and Wyoming in the United States.

Crystal structure

Magnesioferrit crystallizes in the space group Fd3m cubic with the lattice parameters a = Å, and eight formula units per unit cell.