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  2. Spinel - Wikipedia

    en.wikipedia.org/wiki/Spinel

    Polyhedral representation of spinel MgAl 2 O 4. Spinel (/ s p ɪ ˈ n ɛ l, ˈ s p ɪ n əl / [7]) is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula MgAl 2 O 4 in the cubic crystal system. Its name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. [5]

  3. Ceylonite - Wikipedia

    en.wikipedia.org/wiki/Ceylonite

    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 ...

  4. 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.

  5. Magnesioferrite - Wikipedia

    en.wikipedia.org/wiki/Magnesioferrite

    Magnesioferrite is a magnesium iron oxide mineral, a member of the magnetite series of spinels.Magnesioferrite crystallizes as black metallic octahedral crystals. It is named after its chemical composition of magnesium and ferric iron.

  6. Franklinite - Wikipedia

    en.wikipedia.org/wiki/Franklinite

    Franklinite is an oxide mineral belonging to the normal spinel subgroup's iron (Fe) series, with the formula Zn 2+ Fe 2 3+ O 4.. As with another spinel member magnetite, both ferrous (2+) and ferric (3+) iron may be present in franklinite samples.

  7. Here's the Real Meaning Behind the Black Heart Emoji - AOL

    www.aol.com/heres-real-meaning-behind-black...

    Emojis can be so helpful yet so confusing. Here's a breakdown of what the black heart emoji means and how and when it can be used.

  8. 20 iconic slang words from Black Twitter that shaped pop culture

    www.aol.com/20-iconic-slang-words-black...

    The term Black Twitter comprises a large network of Black users on the platform and their loosely coordinated interactions, many of which accumulate into trending topics due to its size ...

  9. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    However, pearl has also been interpreted to be the meaning in these passages. It is comparatively certain that pearl (Greek margarite, Vulg. margarita) was known among the Jews, at least after the time of Solomon, as it was among the Phoenicians. The exact etymology is uncertain.

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