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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. [22]

  3. List of minerals - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals

    This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species .

  4. List of minerals recognized by the International ...

    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. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, ... Tourmaline subgroup: Achroite (var.) Chrome ... Some minerals made into gemstones may display a chatoyancy or cat's eye effect, ...

  6. List of minerals recognized by the International ...

    en.wikipedia.org/wiki/List_of_minerals...

    This list includes those recognised minerals beginning with the letter T.The International Mineralogical Association is the international group that recognises new minerals and new mineral names; however, minerals discovered before 1959 did not go through the official naming procedure, although some minerals published previously have been either confirmed or discredited since that date.

  7. List of minerals recognized by the International ...

    en.wikipedia.org/wiki/List_of_minerals_recognized...

    This list includes those recognised minerals beginning with the letters U and V.The International Mineralogical Association is the international group that recognises new minerals and new mineral names; however, minerals discovered before 1959 did not go through the official naming procedure, although some minerals published previously have been either confirmed or discredited since that date.

  8. List of minerals by optical properties - Wikipedia

    en.wikipedia.org/wiki/List_of_minerals_by...

    Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013

  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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