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  2. Spinel group - Wikipedia

    en.wikipedia.org/wiki/Spinel_group

    Cobalt spinels: Manganesecobaltite: Mn 1.5 Co 1.5 O 4 [8] Vanadium spinels: Coulsonite: FeV 2 O 4; Magnesiocoulsonite: MgV 2 O 4; Others with the spinel structure: Ringwoodite: (Mg,Fe) 2 SiO 4, an abundant olivine polymorph within the Earth's mantle from about 520 to 660 km depth, and a rare mineral in meteorites; Musgravite: Be(Mg,Fe,Zn) 2 Al ...

  3. 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]

  4. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide

  5. Gemstone Meanings: Power and Significance of the 25 Most ...

    www.aol.com/gemstone-meanings-power-significance...

    Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.

  6. Linnaeite - Wikipedia

    en.wikipedia.org/wiki/Linnaeite

    Linnaeite is a cobalt sulfide mineral with the composition Co +2 Co +3 2 S 4. It was discovered in 1845 in Västmanland, Sweden, and was named to honor Carl Linnaeus (1707–1778). [2] Linnaeite forms a series with polydymite, Ni +2 Ni +3 2 S 4. [5] Linnaeite is found in hydrothermal veins with other cobalt and nickel sulfides in many ...

  7. Lapidary medicine - Wikipedia

    en.wikipedia.org/wiki/Lapidary_Medicine

    Lapidary medicine is a pseudoscientific concept based on the belief that gemstones have healing properties. The source of the idea of lapidary medicine stems from information found in lapidaries, books giving "information about the properties and virtues of precious and semi-precious stones."

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