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  2. Tourmaline - Wikipedia

    en.wikipedia.org/wiki/Tourmaline

    For example, blue indicolite tourmaline is the only blue gemstone of any kind that will show a drag response when a neodymium magnet is applied. Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron.

  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. 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.

  5. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Whether a gemstone is a natural stone or synthetic, the chemical, physical, and optical characteristics are the same: They are composed of the same mineral and are colored by the same trace materials, have the same hardness and density and strength, and show the same color spectrum, refractive index, and birefringence (if any). Lab-created ...

  6. 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.

  7. Pyroelectricity - Wikipedia

    en.wikipedia.org/wiki/Pyroelectricity

    The misconception arose soon after the discovery of the pyroelectric properties of tourmaline, which made mineralogists of the time associate the legendary stone Lyngurium with it. [16] Lyngurium is described in the work of Theophrastus as being similar to amber, without specifying any pyroelectric properties. [17]

  8. 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]

  9. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    This is followed by deposition of albite, lepidolite, gem tourmaline, beryl, spodumene, amblygonite, topaz, apatite, and fluorite, which may partially replace some of the minerals in the earlier zone. [5] The center of the pegmatite may have cavities lined with spectacular gemstone crystals. [20] Some pegmatites have more complex zoning.

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