The inverse spinel structure of magnetite Fe3O4.

(Fe3O4) has an inverse cubic spinel structure [10]. The crystal structure of Fe3O4 consists of a unit cell which contains oxygen ions in closepacked (face-centred cubic) FCC structure and …

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Spinel

A hard and durable gemstone, spinel scores an 8 on the Mohs scale of mineral hardness, making it a perfect choice for a piece of jewellery. Spinels can come in a myriad of colours, including …

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Raman fingerprint of chromate, aluminate and …

Ten spinel single crystals having compositions closely approaching spinel end-members ZnCr2O4, MgCr2O4, FeCr2O4, ZnAl2O4, MgAl2O4, CoAl2O4, FeAl2O4, MnAl2O4, MgFe2O4, and FeFe2O4 have been …

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8.7: Spinel, Perovskite, and Rutile Structures

The structure is named after the mineral MgAl 2 O 4, and oxide spinels have the general formula AB 2 O 4. In the normal spinel structure, there is a close-packed array of anions. The A-site cations fill 1/8 of the tetrahedral …

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Spinelle

Define spinelle. spinelle synonyms, spinelle pronunciation, spinelle translation, English dictionary definition of spinelle. also spi·nelle n. ... English dictionary definition of spinelle. also spi·nelle n. …

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Définition | Spinelle

Le spinelle est un minéral mais cette dénomination sert également à désigner un groupe de minéraux. De formule MgAl2O4, il s'agit d'un oxyde de magnésium et d'aluminium qui ...

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Pleonaste: Mineral information, data and …

- Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for …

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Spinel Gemstone | Spinel Stone

Mineralogist Jean Baptiste Louis Rome de Lisle identifies spinel as a different mineral than ruby. Facts. Mineral: spinel; Chemistry: MgAl 2 O 4; Color: red, orange, pink, purple, blue, black; ... a mineral species that includes …

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Fiche du Spinelle

Critères de valeur du spinelle. Comme pour la plupart des pierres fines (ou semi-précieuses), la couleur et son degré de saturation sont des facteurs très important pour déterminer la valeur …

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Spinel | Gemstone, Hardness, Structure | Britannica

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 …

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SPINELS (Normal or Inverse)

EXAMPLES FOR SPINEL AND INVERSE SPINEL STRUCTURES 1) MgAl 2 O 4 is a normal spinel since both the divalent and trivalent ions are non transition metal ions. There is no question of CFSE. 2) Mn 3 O 4 is a normal spinel since …

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ORIGINS OF CHROMIAN AND ALUMINOUS SPINEL …

A comparison is made of the major- and minor-element compositions of spinel-group minerals that occur as single-crystal macrocrysts in kimberlites from southern Africa (approximately 1500 …

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Chromite deposits in the northern Oman ophiolite: …

Maurel, C.: Etude expérimentale de l'équilibre spinelle chromifère liquide silicaté basique. SFMC Meet. "Les spinelles", Lille, oral. comm. (1984) Maurel, C., Maurel, P.: Etude expérimentale de …

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Maurel, C. and Maurel, P. (1982) Etude expérimentale de la …

Maurel, C. and Maurel, P. (1982) Etude expérimentale de la distribution de l'aluminium entre bain silicaté basique et spinelle chromifère. Implications pétrogénétiques Teneur en chrome des …

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CHROMIAN SPINEL IN THE TURNAGAIN ALASKAN-TYPE

Chromian spinel is a common accessory mineral (<0.5–4 vol.%) in the ultramafic rocks of the intrusion and is locally found as massive chromitite schlieren, pods, and rare layers in dunite. …

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Spinel • Resurrection of a Classic

Spinelle was accepted by the French Academy of Science in 1762, possibly coming from the Italian spinello, meaning "joint" (Deville, 2002) or spina, meaning "thorn" (Webster, 1994). As mineralogical analysis moved forward, the use of …

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Spinel MgAl2O4

Mineral Group: Spinel supergroup, oxyspinel group, spinel subgroup. Occurrence: A common mineral, formed at high-temperatures as an accessory in igneous rocks, principally basalts, …

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The spinel Mineral Series

Detailed description, properties, and locality information guide about the mineral spinel: including ruby spinel, gahnite, galaxite, and hercynite.

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Chrome-Spinel (of Dana): Mineral information, data and …

- Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral …

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Gahnite: Mineral information, data and localities.

- Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for …

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Spinel: Mineral information, data and localities.

The name spinel has commonly been used in petrological literature as a synonym for any spinel group minerals, especially in igneous rocks. Usually red due to trace chromium. Other coloured …

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Humite Group: Mineral information, data and …

Three of them are distinguished on the basis of their chemistry, whereas the leucophoenicite subgroup minerals are unit cell-twinned polymorphs of the corresponding humite-group minerals. The humite group is structurally related …

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Spinel Supergroup: Mineral information, data and …

A supergroup that includes minerals with a spinel-type structure, with the general formula AD2X4. ... de Jong W, Hoog A (1928) ... Reuter B, Riedel E, Hug P, Arndt D, Geisler U, Behnke J (1969) Zur kristallchemie der vanadin(III)-spinelle …

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SPINEL & INVERSE SPINEL CRYSTAL …

EXAMPLES FOR SPINEL AND INVERSE SPINEL STRUCTURES. 1) MgAl 2 O 4 has normal spinel structure since both the divalent and trivalent ions are non transition metal ions. There is no question of CFSE. 2) Mn 3 O 4 is a normal …

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Systematics of the spinel structure type | Physics and

Systematic trends in the geometry of 149 oxide and 80 sulfide binary and ternary spinels have been examined from the standpoint of ionic radius and electronegativity. The mean ionic radii …

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Le pointement de péridotite à grenat-spinelle de La Croix …

Le pointement de péridotite à grenat-spinelle de La Croix-Valmer (Maures centrales): un cumulat d'affinité océanique impliqué dans la subduction éohercynienne ? ...

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Pierre

Le Rubis de Timur. Le "Timur Ruby" est un spinelle rouge vif de 352,5 carats qui se trouve actuellement dans un collier de la Royal Collection qui a été fabriqué pour la reine Victoria en 1853. La pierre a été trouvée en Afghanistan et porte …

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Minéral spinelle | Propriétés, formation, occurrence et …

La présence de spinelle aux côtés de ces minéraux dépend des processus et conditions géologiques spécifiques de chaque région. Utilisations du spinelle Le spinelle a une …

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Chapter 9 AB2X4 structure

Spinels have the general formula, AB 2 O 4, where A is a divalent cation and B is a trivalent cation—for example, MgAl 2 O 4 spinel, Fe 3 O 4 magnetite, FeCr 2 O 4 chromite, and …

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