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  2. Luminous gemstones - Wikipedia

    en.wikipedia.org/wiki/Luminous_gemstones

    Some fluorite, particularly the variety chlorophane (aka pyroemerald and cobra stone), may become very faintly luminescent simply from the heat of one's hand. Chlorophane is unusual for combining the properties of thermoluminescence, triboluminescence, phosphorescence, and fluorescence; it will emit visible spectrum light when rubbed, or ...

  3. Fluorite - Wikipedia

    en.wikipedia.org/wiki/Fluorite

    In fluorite, the visible light emitted is most commonly blue, but red, purple, yellow, green, and white also occur. The fluorescence of fluorite may be due to mineral impurities, such as yttrium and ytterbium , or organic matter, such as volatile hydrocarbons in the crystal lattice.

  4. 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.

  5. Chlorophane - Wikipedia

    en.wikipedia.org/wiki/Chlorophane

    Chlorophane, also sometimes known as pyroemerald, cobra stone, and pyrosmaragd, is a rare variety of the mineral fluorite with the unusual combined properties of thermoluminescence, thermophosphoresence, triboluminescence, and fluorescence: it will emit light in the visible spectrum when exposed to ultraviolet light, when heated, and when ...

  6. Pyrochlore - Wikipedia

    en.wikipedia.org/wiki/Pyrochlore

    The more general crystal structure describes materials of the type A 2 B 2 O 6 and A 2 B 2 O 7 where the A and B species are generally rare-earth or transition metal species; e.g. Y 2 Ti 2 O 7.The pyrochlore structure is a super structure derivative of the simple fluorite structure (AO 2 = A 4 O 8), where the A and B cations are ordered along ...

  7. Lustre (mineralogy) - Wikipedia

    en.wikipedia.org/wiki/Lustre_(mineralogy)

    Lustre (British English) or luster (American English; see spelling differences) is the way light interacts with the surface of a crystal, rock, or mineral.The word traces its origins back to the Latin lux, meaning "light", and generally implies radiance, gloss, or brilliance.

  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. Cleavage (crystal) - Wikipedia

    en.wikipedia.org/wiki/Cleavage_(crystal)

    Green fluorite with prominent cleavage Biotite with basal cleavage. Cleavage, in mineralogy and materials science, is the tendency of crystalline materials to split along definite crystallographic structural planes.

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