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2. Spinel group - Wikipedia

   en.wikipedia.org/wiki/Spinel_group

   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.

3. Perovskite (structure) - Wikipedia

   en.wikipedia.org/wiki/Perovskite_(structure)

   The red spheres are X atoms (usually oxygens), the blue spheres are B atoms (a smaller metal cation, such as Ti 4+), and the green spheres are the A atoms (a larger metal cation, such as Ca 2+). Pictured is the undistorted cubic structure; the symmetry is lowered to orthorhombic, tetragonal or trigonal in many perovskites.

4. Cation-anion radius ratio - Wikipedia

   en.wikipedia.org/wiki/Cation-anion_radius_ratio

   In condensed matter physics and inorganic chemistry, the cation-anion radius ratio can be used to predict the crystal structure of an ionic compound based on the relative size of its atoms. It is defined as the ratio of the ionic radius of the positively charged cation to the ionic radius of the negatively charged anion in a cation-anion compound.

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   www.aol.com/lifestyle/heres-what-aol-readers-are...

   This chic Michael Kors bag is a whopping $267 off at Walmart right now, meaning you can pick it up for just shy of $60. It's a crossbody ordained with the MK logo in a cream color, so it'll match ...

6. Asterism (gemology) - Wikipedia

   en.wikipedia.org/wiki/Asterism_(gemology)

   Asterism is generated by reflections of light from twin-lamellae or from extremely fine needle-shaped acicular inclusions within the stone's crystal structure. [1] A common cause is oriented sub-microscopic crystals of rutile within the gem mineral. It occurs in rubies, sapphires, garnet, diopside, and spinel when a cabochon is cut from a ...

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. All of the best Black Friday deals: Amazon, Walmart, Wayfair ...

   www.aol.com/lifestyle/all-of-the-best-black...

   Updated: Black Friday's best weekend deals are here on Apple AirPods and iPads, Samsung TVs, Bissell vacuums, KitchenAid and Ninja small appliances, gifts for men, women and kids — and more.

9. 16 Restaurants That Are Open on Thanksgiving Day (Plus 12 ...

   www.aol.com/16-restaurants-open-thanksgiving-day...

   1. Cracker Barrel. Cracker Barrels are open regular hours on Thanksgiving. You can eat a turkey dinner in the restaurant, or order a Thanksgiving family-size meal to go if you don’t feel like ...