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It is widely used as an inexpensive cut gem in birthstone jewelry for the month of August. Light blue synthetic spinel is a good imitation of aquamarine beryl, and green synthetic spinel is used as an emerald or tourmaline simulant. [29] By 2015, transparent spinel was being made in sheets and other shapes through sintering. [30]
Gahnite, ZnAl 2 O 4, is a rare mineral belonging to the spinel group. It forms octahedral crystals which may be green, blue, yellow, brown or grey. It often forms as an alteration product of sphalerite in altered massive sulphide deposits such as at Broken Hill, Australia.
The mineral ceylonite has the chemical composition of (Mg, Fe 2+) Al 2 O 4, 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] 2 O 4; where [A] is commonly Fe 2+, Mg 2+, or Mn 2+, and [B] is Fe 3+, Al 3+, or Cr 3+. It is an iron-rich variety of the spinel ...
Inverse spinel structures have a different cation distribution in that all of the A cations and half of the B cations occupy octahedral sites, while the other half of the B cations occupy tetrahedral sites. An example of an inverse spinel is Fe 3 O 4, if the Fe 2+ (A 2+) ions are d 6 high-spin and the Fe 3+ (B 3+) ions are d 5 high-spin.
Connections between Islam, Europe, and the Far East in the Medieval Period: The Evidence of the Jewelry Technology, Eds P. Jett, J Douglas, B. McCarthy, J Winter. Scientific Research in the Field of Asian Art, Fiftieth-Anniversary Symposium Proceedings. Archetype Publications, London in association with the Freer Gallery of Art, Smithsonian ...
The jewel was commissioned by Duke John the Fearless of Burgundy in the late 1380s, and was one of the most precious treasures of the House of Burgundy. [1] It was created by Parisian goldsmith Herman Ruissel in 1389; the jewel's sale is recorded through a bill dated 11 October and a receipt dated 24 November, both of which are kept in the Côte-d'Or Departmental Archives in Dijon.
Green's Shell Enclosure is a historic archeological site located at Hilton Head Island, Beaufort County, South Carolina. The site includes one of 20 or more prehistoric Indian shell middens in a ring shape located from the central coast of South Carolina to the central coast of Georgia.
An elaborate diamond and emerald Aigrette, set in silver.Part of the Iranian Crown Jewels. The Iranian National Jewels (Persian: جواهرات ملی ایران, Javāherāt-e Melli-ye Irān), originally the Iranian Crown Jewels (Persian: جواهرات سلطنتی ایران, Javāherāt-e Saltanati-ye Irān), include elaborate crowns, thirty tiaras, and numerous aigrettes, a dozen ...
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