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  2. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    Crystals may be green at one end and pink at the other, or green on the outside and pink inside; this type is called watermelon tourmaline and is prized in jewelry. An excellent example of watermelon tourmaline jewelry is a brooch piece (1969, gold, watermelon tourmaline, diamonds) by Andrew Grima (British, b.

  3. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    [4] [5] Most gemstones are hard, but some softer minerals such as brazilianite may be used in jewelry [6] because of their color or luster or other physical properties that have aesthetic value. However, generally speaking, soft minerals are not typically used as gemstones by virtue of their brittleness and lack of durability. [7]

  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. 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 ...

  6. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.

  7. Agate - Wikipedia

    en.wikipedia.org/wiki/Agate

    Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...

  8. Food poisoning is extremely common. But that doesn't ... - AOL

    www.aol.com/food-poisoning-extremely-common...

    Few things will put a damper on your vacation or holiday faster than food poisoning.The intense stomach pain, rushing to the toilet and feeling relegated to bed keeps just about everyone out of ...

  9. Fluor-liddicoatite - Wikipedia

    en.wikipedia.org/wiki/Fluor-liddicoatite

    Fluor-liddicoatite [7] is a rare member of the tourmaline group of minerals, elbaite subgroup, and the theoretical calcium endmember of the elbaite-fluor-liddicoatite series; the pure end-member has not yet been found in nature. [3]

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