Fluorite: Gemstone Information
Fluorite, CaF2, for which fluorspar is an old name, forms fine transparent crystals in a range of colors which include colorless, yellow, brown, green, blue, violet and pink. The green may resemble that of emerald in specimens found near Otjiwarongo, Namibia. Blue John is the traditional name for a highly characteristic massive banded translucent white/blue/violet/purple variety of fluorite found in the Castleton area, Derbyshire, England. Fluorite occurs as cubic crystals with an octahedral perfect and easy cleavage which often gives rise to the mistaken impression that the mineral forms octahedra in preference to cubes.
Inter penetrant twinning is common and dodecahedra and combinations can be found as well as a number of other forms. Virtually all fluorite octahedra found on sale have been cleaved by dealers. Fluorite has a hardness of 4 and SG usually near 3.18; the RI is 1.432–1.434.Under LWUV blue, violet, red, green and yellow responses have been reported. It may show thermoluminescence or triboluminescence and some specimens phosphoresce.
Blue John shows no response to energies above those of visible light. Fluorite is named for its low melting point. Fluorite occurs in low-to-high temperature hydrothermal veins, granites and granite pegmatites. Details of the fluorite occurrences in Derbyshire, England, can be found in different works by Trevor D. Ford including Derbyshire Blue John (2000: 1873775199) and the fluorite deposits of the Northern Pennine Orefield, England, are covered by successive editions of Geology of the Northern Pennine Orefield, the latest being volumes 1 (1990) and 2 (1985) by K.C.
Dunham in the series Economic Memoirs of the British Geological Survey. The Friends of Killhope’s Fluorspar in the North Pennines (2001) is a useful guide to the fluorite of that area as are British Mining 47 and 57, dealing with Alston Moor (1993) and the Weardale Mines (1996), the publishers of the British Mining series are the Northern Mine Research Society. Most fine crystals of fluorite are not faceted (though faceted stones can be very beautiful) as fine groups sell for high prices.
Examples of deep pink to red fluorite from the Chamonix area of the European Alps were exhibited at the Natural History Museum in London some years ago and attracted great interest. Fluorite showing smoky-brown in daylight and mauve in incandescent light has been reported from India. Gem-quality fluorite from deposits in Hardin and Pope counties, Illinois, USA, is discussed in detail by Bastin in Bulletin no. 58 (1931) of the State Geological
Survey of Illinois; the deposits extend into Crittenden county, Kentucky. The Illinois mines are center in the Rosiclare district and also at Cave-in-Rock. Crystals show a wide variety of colors with characteristic zoning parallel to crystal faces. The cause of the violet color in some fluorite has been ascribed to Mie scattering from microcrystals of calcium metal; this is cited by Nassau in The Physics and Chemistry of Color (2000).
The blue color arises from the presence of an F-center. Colorless fluorite can be irradiated with energetic radiation to give F-centers, named from the German Farbe (color).The specimen will turn purple. Nassau (2000) gives an explanation of the mechanisms involved. The blue luminescence seen in fluorite, on the other hand, is believed to arise from the presence of Eu2 or an associated color center.
Bill, in Physics and Chemistry of Minerals 3, 117–31 (1978) cited by Nassau (op. cit.),states that a color center combination of Y3+ with a fluorine vacancy can also give a blue color and that a combination of this with Ce gives a yellowish green. O 3-substituting for F-gives yellow and Y3+ + O2 3 a pink. In green fluorite, weak bands have been reported at 634, 610, 582 and 445 nm, and there is also a strong broad band at 427 nm which may be seen in sizeable pieces. A part of the extra Lapis series (no. 4, 1993, ISBN 3921656273) includes valuable papers and beautiful photographs.
The Marvels and Benefits of Fluorite Gemstone
Introduction:
Fluorite, with its captivating hues and remarkable properties, has long been cherished by gemstone enthusiasts and spiritual practitioners alike. From its stunning appearance to its metaphysical significance, fluorite continues to captivate the imagination of those who encounter its beauty. Let’s embark on a journey to explore the fascinating world of fluorite, unraveling its origins, characteristics, and the myriad benefits it offers.
Origin and Formation:
Fluorite, also known as fluorspar, derives its name from the Latin word “fluere,” meaning “to flow,” owing to its historical use as a flux in metallurgy. This colorful gemstone is primarily formed through hydrothermal processes involving the deposition of fluoride-rich fluids in sedimentary and igneous environments. Fluorite deposits can be found in various geological settings worldwide, including China, Mexico, the United States, and Russia. Its formation over millions of years results in the development of cubic or octahedral crystals, often exhibiting vibrant colors and intricate patterns.
Physical Characteristics:
One of the most striking features of fluorite is its wide range of colors, which include shades of purple, green, blue, yellow, and colorless varieties. This diversity of hues is attributed to the presence of trace elements and impurities within its crystalline structure. Fluorite crystals may display a translucent to transparent clarity, allowing light to pass through and enhance their brilliance. Its vitreous luster and distinct cleavage planes contribute to its visual appeal and versatility in lapidary applications.
Metaphysical Properties:
Fluorite is revered for its metaphysical properties and spiritual significance, believed to harmonize the mind, body, and spirit while facilitating inner growth and enlightenment. In crystal healing practices, fluorite is associated with cleansing and purifying the aura, dispelling negative energy, and promoting mental clarity and focus. It is often used as a meditation aid to enhance intuition, creativity, and spiritual insight. Additionally, fluorite is thought to align with the third eye chakra, stimulating psychic abilities and enhancing spiritual awareness.
Healing Benefits:
Fluorite is purported to offer a range of healing benefits for both physical and emotional well-being. It is said to support the immune system, balance hormonal function, and promote overall vitality and wellness. Some believe that fluorite can alleviate symptoms of stress, anxiety, and depression by soothing the nervous system and promoting relaxation. Additionally, fluorite is thought to facilitate emotional healing, helping individuals release pent-up emotions and find inner peace and serenity.
Chakra Alignment:
Fluorite is closely associated with the third eye chakra, which governs intuition, perception, and spiritual insight. By activating and aligning the third eye chakra, fluorite enhances one’s ability to perceive subtle energies, access higher realms of consciousness, and connect with spiritual guidance. This alignment fosters clarity of thought, inner wisdom, and expanded awareness, empowering individuals to navigate life’s challenges with grace and insight. Moreover, fluorite’s energy may also resonate with other chakras, such as the heart chakra, promoting emotional balance and compassion.
Care and Maintenance:
To preserve its natural beauty and energetic properties, proper care and maintenance are essential for fluorite gemstones and specimens. It is recommended to clean fluorite jewelry and crystals with a soft, damp cloth and mild detergent, avoiding exposure to harsh chemicals or abrasive cleaners. Storing fluorite away from direct sunlight and extreme temperatures can help prevent discoloration or damage over time.
Conclusion:
Fluorite stands as a testament to nature’s artistry, captivating the senses with its vibrant colors and mystical energy. Whether admired for its aesthetic beauty, cherished for its metaphysical properties, or valued for its healing benefits, fluorite continues to inspire awe and wonder in those who encounter it. As we delve deeper into the enchanting world of fluorite, we discover not only its physical attributes but also its profound potential to uplift, heal, and transform lives on a profound level.
