of the spinel group. Spinels are grouped in series by the B cation. The group is named for spinel (MgAl 2O 4), which was once known as "spinel ruby"....

Spinel (/spɪˈnɛl, ˈspɪnəl/) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2O 4 in the cubic crystal...

hardness can be assigned: the hardness of corundum is 9 and that of some spinel-group minerals is near 8, but the hardness of others such as magnetite is near...

Ringwoodite is polymorphous with forsterite, Mg2SiO4, and has a spinel structure. Spinel group minerals crystallize in the isometric system with an octahedral...

chemical formula of FeCr2O4. It is an oxide mineral belonging to the spinel group. The element magnesium can substitute for iron in variable amounts as...

Gahnite, ZnAl2O4, is a rare mineral belonging to the spinel group. It forms octahedral crystals which may be green, blue, yellow, brown or grey. It often...

mineral belonging to the normal spinel subgroup's iron (Fe) series, with the formula Zn2+Fe23+O4. As with another spinel member magnetite, both ferrous...

ions and unit cell length is a = 0.839 nm. As a member of the inverse spinel group, magnetite can form solid solutions with similarly structured minerals...

Franckeite Frankamenite Frankdicksonite Frankhawthorneite Franklinite (spinel group) Franklinphilite Freibergite Freieslebenite Fukuchilite Varieties that...

Fe2+) Al2O4, putting it into a group of minerals known as the spinel group, or the oxide spinels. The oxide spinels have a formula of the model [A][B]2O4;...

Mica group Pyroxene group Rutile group Serpentine group Smectite group Sodalite group Spinel group Tetradymite group Mineral Mineral variety Stuart J...

doi:10.1098/rspa.1914.0015. Bragg WH (1915). "The structure of the spinel group of crystals". Phil. Mag. 30 (176): 305. doi:10.1080/14786440808635400...

element. Common, naturally occurring ferrites (typically members of the spinel group) include those with nickel (NiFe2O4) which occurs as the mineral trevorite...

mogensenite, Ti-magnetite, or titanian magnetite. It is part of the spinel group of minerals. The Curie temperature for titanomagnetite has been found...

Hercynite is a spinel mineral with the formula FeAl2O4. It occurs in high-grade metamorphosed iron-rich argillaceous (clay-containing) sediments as well...

is a magnesium iron oxide mineral, a member of the magnetite series of spinels. Magnesioferrite crystallizes as black metallic octahedral crystals. It...

chromium oxide mineral with formula Fe2+Cr2O4. It is a member of the spinel group and a high pressure polymorph of chromite. It was discovered in samples...

for magnetite (Fe3O4), the corresponding iron oxide. It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic...

hydrazine, or reacting iron oxides and zinc oxide at high temperature. Spinel (Zn, Fe) Fe2O4 appears as a tan-colored solid that is insoluble in water...

Cuprospinel is a mineral. Cuprospinel is an inverse spinel with the chemical formula CuFe2O4, where copper substitutes some of the iron cations in the...

A ternary compound of type A2BX4 may be in the class of olivine, the spinel group, or phenakite. Examples include K2NiF4, β-K2SO4, and CaFe2O4. One of...

isometric crystals with a Mohs hardness of 5.5 to 6. It belongs to the spinel group of minerals, as does magnetite, Fe3O4. Ulvöspinel forms as solid solutions...

pyrope garnet, Cr-diopside, magnesian ilmenite, and spinel. Olivine lamproites were previously called group II kimberlite or orangeite in response to the mistaken...

Galaxite, also known as 'mangan-spinel' is an isometric mineral belonging to the spinel group of oxides with the ideal chemical formula Mn2+Al2O4. Galaxite...

{\underbrace{3(\alpha-Fe2O3)}_{hematite}}}}} Fe3O4 has a cubic inverse spinel group structure which consists of a cubic close packed array of oxide ions...

"Tribute to the World") is an unfaceted, 352.54-carat (71 g) polished red spinel set in a necklace. It is named after the ruler Timur, founder of the Timurid...

metals (e.g. Fe, Ni). This can be termed spinel hydrolysis. Magnetite, chromite and ilmenite are Fe-spinel group minerals found in many rocks but rarely...

mineral belonging to the spinel group. It has the chemical formula NiFe3+2O4. It is a black mineral with the typical spinel properties of crystallising...

temperatures of those minerals. The Curie temperature of magnetite, a spinel-group iron oxide, is about 580 °C, whereas most basalt and gabbro are completely...

Zincochromite Zincochromite found in Russia General Category Spinel group Formula (repeating unit) ZnCr2O4 IMA symbol Zchr Strunz classification 4.BB.05...