• Spinel group - Wikipedia

    en.wikipedia.org/wiki/Spinel_group The space group for a spinel group mineral may be Fd 3 m (the same as for diamond), but in some cases (such as spinel itself, MgAl 2 O 4) it is actually the tetrahedral F 4 3m.. Normal spinel structures are usually cubic close-packed oxides with eight tetrahedral and four octahedral sites per formula unit. The tetrahedral spaces are smaller than the octahedral spaces. B ions occupy half the ...
  • Spinel group | mineralogy | Britannica

    www.britannica.com/science/spinel-group The spinel-group minerals have type XY 2 O 4 and contain oxygen atoms in approximate cubic closest packing. The cations located within the oxygen framework are octahedrally (sixfold) and tetrahedrally (fourfold) coordinated with oxygen ...
  • Spinel Group | Definition of Spinel Group by Merriam-Webster

    www.merriam-webster.com/dictionary/spinel%20group Spinel group definition is - a group of mineral oxides including the spinel series and having the general composition AB2O4 in which A represents magnesium, ferrous iron, zinc, or manganese or any combination of them and B represents aluminum, ferric iron, or chromium.
  • Mineral Gallery - The Spinel Group

    www.galleries.com/Spinel_Group The Spinel Group contains over twenty members, but only a few are considered common. They are a group of oxides that have very similar structures. Named after their sole gemstone representative, spinel, this is an important group of minerals. It includes one of the most important ores of iron, magnetite; an important ore of chromium, chromite, an important ore of lead, minium; a once important ...
  • Spinel group — Wikipedia Republished // WIKI 2

    wiki2.org/en/Spinel_group Spinel group From Wikipedia, the free encyclopedia The spinels are any of a class of minerals of general formulation AB 2 X 4 which crystallise in the cubic (isometric) crystal system, with the X anions (typically chalcogens , like oxygen and sulfur ) arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the ...
  • Spinel Group: Mineral information, data and localities.

    www.mindat.org/show.php The former spinel group is probably synonym with the new IMA approved Spinel Subgroup. Chemical Properties of Spinel GroupHide. Formula: AE 2 O 4. Elements listed: O - search for minerals with similar chemistry. Synonyms of Spinel GroupHide. Spinelid. Spinellid ...
  • Spinel Group | An Introduction to the Rock-Forming ...

    pubs.geoscienceworld.org/books/book/952/chapter/106864782/Spinel-Group In this edition of Introduction to the Rock-Forming Minerals, most of the commonly occurring minerals of igneous, metamorphic and sedimentary rocks are discussed in terms of structure, chemistry, optical and other physical properties, distinguishing features and paragenesis.
  • The spinel group | American Mineralogist | GeoScienceWorld

    pubs.geoscienceworld.org/msa/ammin/article-abstract/26/7/.../The-spinel-group spinel group; View Full GeoRef Record. POWERED BY . Citing articles via. CrossRef. Related Articles. The oriented attachment mechanism in the formation of twins - a survey European Journal of Mineralogy. Composition of spinels in micaceous kimberlite from the Upper Canada Mine, Kirkland Lake, Ontario The Canadian Mineralogist ...
  • Spinel | mineral | Britannica

    www.britannica.com/science/spinel Spinel, mineral composed of magnesium aluminum oxide (MgAl2O4) or any member of a group of rock-forming minerals, all of which are metal oxides with the general composition AB2O4, in which A may be magnesium, iron, zinc, manganese, or nickel; B may be aluminum, chromium, or iron; and O is oxygen.
  • Spinel: The mineral Spinel information and pictures

    www.minerals.net/mineral/spinel.aspx Chemical Formula: MgAl 2 O 4 The Mg may be partially or fully replaced by Fe, Zn, and/or Mn. This leads to a mineral series with the formula (Mg,Fe,Zn,Mn)Al 2 O 4.The end-members of the Spinel group are individually categorized: