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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]
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 ...
The so-called inversion degree, x, adopts values between 0 (normal) and 1 (inverse), and is equal to 2 ⁄ 3 for a completely random cation distribution. The cation distribution in spinel structures are related to the crystal field stabilization energies (CFSE) of the constituent transition metals.
In 2015, the auction house Bonhams sold the 50.13-carat Hope Spinel for a world-record £962,500 ($1.22m) — over six times its estimate — helping to catapult the stone into public consciousness.
Ringwoodite is polymorphous with forsterite, Mg 2 SiO 4, and has a spinel structure.Spinel group minerals crystallize in the isometric system with an octahedral habit. Olivine is most abundant in the upper mantle, above about 410 km (250 mi); the olivine polymorphs wadsleyite and ringwoodite are thought to dominate the transition zone of the mantle, a zone present from about 410 to 660 km
Detailed view of the recreated great Golden Fleece of king Louis XV of France. Below the 107 carats (21.4 g) spinel Côte de Bretagne hangs the French Blue diamond and the fleece itself, set with hundreds of yellow diamond replicas. The Tavernier Blue was the precursor diamond to the Blue Diamond of the French Crown (aka the French Blue).
Technically, anything over 20 years old can be coined "vintage." But when you truly think of items worth this title, your brain doesn't go to Beanie Babies. Instead, it conjures up images of vinyl...
GM's CFO told investors the company has changed its business strategy to withstand market volatility and a new presidential administration.
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