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Blue, unbanded fluorite occurs in many localities around the world. Within the UK, blue fluorspars are also found in County Durham, especially Weardale. [1]: 39 Elsewhere, blue fluorspar is known in the Ardennes region of Belgium; the Cave-in-Rock area of Illinois in the United States; [1]: 39 and at various localities in Mexico and China.
Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties. High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice , which in turn alters the optical properties within it. [ 1 ]
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.
Lapidaries portrayed "the most common method of medical application" being wearing the stone on one's person in a jewelry setting, for example, in a ring or a necklace or held the stone against the skin. Allowing direct contact between the gem and the skin was encouraged to facilitate the transfer of healing properties. [19]
Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals. Adherents of the practice claim that these have healing ...
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
The name apophyllite refers to a specific group of phyllosilicates, a class of minerals.Originally, the group name referred to a specific mineral, [4] but was redefined in 1978 to stand for a class of minerals of similar chemical makeup that comprise a solid solution series, and includes the members fluorapophyllite-(K), fluorapophyllite-(Na), hydroxyapophyllite-(K).
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