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  2. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    Another highly valuable variety is chrome tourmaline, a rare type of dravite tourmaline from Tanzania. Chrome tourmaline is a rich green color due to the presence of chromium atoms in the crystal. Of the standard elbaite colors, blue indicolite gems are typically the most valuable, [32] followed by green verdelite and pink to red rubellite. [33]

  3. Rubellite - Wikipedia

    en.wikipedia.org/wiki/Rubellite

    Rubellite is the red or pink variety of tourmaline and is a member of elbaite. Rubellite is also the rarest gem in its family. [2] It is occasionally mistaken for ruby. [3] These gems typically contain inclusions. [4] Notable countries where rubellite can be mined include Afghanistan, Brazil, Madagascar, Myanmar, Nigeria, Russia, and the United ...

  4. Elbaite - Wikipedia

    en.wikipedia.org/wiki/Elbaite

    Elbaite, a sodium, lithium, aluminium boro-silicate, with the chemical composition Na(Li 1.5 Al 1.5)Al 6 Si 6 O 18 (BO 3) 3 (OH) 4, [4] is a mineral species belonging to the six-member ring cyclosilicate tourmaline group. Elbaite forms three series, with dravite, with fluor-liddicoatite, and with schorl.

  5. Some of the World's Rarest (and Largest) Gems Are on ... - AOL

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  6. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, organized by species and types. Minerals ... Tourmaline subgroup: Achroite (var.) Chrome (var.) Dravite; Elbaite; Fluor-liddicoatite;

  7. I've been wearing my mom's locket since she died. When ... - AOL

    www.aol.com/ive-wearing-moms-locket-since...

    Katharine Horgan's mom died when she was 7 years old. She left her jewelry and cards, which she treasured. She found the locket at a cafe in London.

  8. The sun may be prone to 'rare but extreme' events that could ...

    www.aol.com/superflares-could-more-common...

    Add solar superflares to the list of natural disasters of concern. Superflares are extremely strong solar flares – explosions with energies up to ten thousand times that of typical solar flares.

  9. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    These complex pegmatites contain unusual minerals of these elements, such as beryl, spodumene, [8] lepidolite, amblygonite, topaz, apatite, fluorite, tourmaline, triphylite, columbite, monazite, and molybdenite. Some of these can be important ore minerals. [5] Some gemstones, such as emerald, are found almost exclusively in pegmatites. [8]