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"....
15 KB (1,943 words) - 11:13, 15 July 2024
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...
16 KB (1,537 words) - 13:47, 16 June 2024
Emery (rock) (redirect from Iron spinel)
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...
4 KB (524 words) - 16:12, 11 July 2024
Ringwoodite (category Spinel group)
Ringwoodite is polymorphous with forsterite, Mg2SiO4, and has a spinel structure. Spinel group minerals crystallize in the isometric system with an octahedral...
20 KB (2,109 words) - 03:46, 1 September 2024
Chromite (category Spinel group)
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...
28 KB (3,017 words) - 16:28, 20 August 2024
Gahnite (redirect from Zinc-spinel)
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...
3 KB (195 words) - 15:03, 31 January 2023
Franklinite (category Spinel group)
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...
4 KB (248 words) - 01:14, 10 January 2024
Magnetite (category Spinel group)
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...
51 KB (5,368 words) - 10:16, 2 July 2024
Franckeite Frankamenite Frankdicksonite Frankhawthorneite Franklinite (spinel group) Franklinphilite Freibergite Freieslebenite Fukuchilite Varieties that...
42 KB (2,782 words) - 11:49, 1 September 2024
Ceylonite (category Spinel gemstones)
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;...
5 KB (620 words) - 22:00, 29 June 2023
Mica group Pyroxene group Rutile group Serpentine group Smectite group Sodalite group Spinel group Tetradymite group Mineral Mineral variety Stuart J...
2 KB (249 words) - 07:26, 14 July 2024
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...
112 KB (11,639 words) - 14:46, 14 July 2024
element. Common, naturally occurring ferrites (typically members of the spinel group) include those with nickel (NiFe2O4) which occurs as the mineral trevorite...
33 KB (3,645 words) - 13:36, 17 August 2024
Titanomagnetite (category Spinel group)
mogensenite, Ti-magnetite, or titanian magnetite. It is part of the spinel group of minerals. The Curie temperature for titanomagnetite has been found...
1 KB (107 words) - 08:48, 14 August 2024
Hercynite (category Spinel group)
Hercynite is a spinel mineral with the formula FeAl2O4. It occurs in high-grade metamorphosed iron-rich argillaceous (clay-containing) sediments as well...
4 KB (255 words) - 15:11, 9 January 2024
Magnesioferrite (category Spinel group)
is a magnesium iron oxide mineral, a member of the magnetite series of spinels. Magnesioferrite crystallizes as black metallic octahedral crystals. It...
3 KB (161 words) - 19:25, 23 July 2024
Xieite (category Spinel group)
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...
2 KB (83 words) - 23:31, 25 January 2024
Hausmannite (category Spinel group)
for magnetite (Fe3O4), the corresponding iron oxide. It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic...
4 KB (279 words) - 01:07, 10 January 2024
Zinc ferrite (category Spinel group)
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...
6 KB (555 words) - 20:43, 22 December 2023
Cuprospinel (category Spinel group)
Cuprospinel is a mineral. Cuprospinel is an inverse spinel with the chemical formula CuFe2O4, where copper substitutes some of the iron cations in the...
25 KB (2,299 words) - 14:27, 24 August 2024
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...
5 KB (652 words) - 22:47, 26 August 2024
Ulvöspinel (category Spinel group)
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...
4 KB (294 words) - 18:58, 19 January 2024
Kimberlite (section Group I kimberlites)
pyrope garnet, Cr-diopside, magnesian ilmenite, and spinel. Olivine lamproites were previously called group II kimberlite or orangeite in response to the mistaken...
31 KB (3,583 words) - 15:51, 25 August 2024
Galaxite (category Spinel gemstones)
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...
4 KB (264 words) - 21:41, 10 January 2024
{\underbrace{3(\alpha-Fe2O3)}_{hematite}}}}} Fe3O4 has a cubic inverse spinel group structure which consists of a cubic close packed array of oxide ions...
23 KB (2,161 words) - 11:15, 5 June 2024
Timur ruby (redirect from Timur spinel)
"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...
7 KB (776 words) - 10:07, 12 July 2024
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...
69 KB (7,359 words) - 12:18, 1 September 2024
Trevorite (category Spinel group)
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...
4 KB (291 words) - 19:23, 23 July 2024
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...
19 KB (2,258 words) - 21:19, 9 April 2024
Zincochromite (category Spinel group)
Zincochromite Zincochromite found in Russia General Category Spinel group Formula (repeating unit) ZnCr2O4 IMA symbol Zchr Strunz classification 4.BB.05...
3 KB (100 words) - 16:41, 2 February 2023