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Topic: Tourmaline

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  Tourmaline - Wikipedia, the free encyclopedia
Tourmaline belongs to the trigonal crystal system and occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section.
Usually, iron-rich tourmalines are fl to bluish-fl to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are practically any color: blue, green, red, yellow, pink etc. Rarely, it is colourless.
Magnesium-rich tourmalines, dravites, are generally restricted to schists and marble.
en.wikipedia.org /wiki/Tourmaline   (600 words)

 Maine's State Mineral - Maine Geological Survey
Tourmaline is one of the most attractive minerals occurring in Maine.
Tourmaline is actually a group of several different minerals which have similar crystal structures, but complex and variable chemical formulas.
Tourmaline crystals and gems from Maine, including the Peary Necklace and one of the largest crystals from Newry, are on display at the Maine State Museum in Augusta.
www.maine.gov /doc/nrimc/mgs/explore/minerals/facts/stmineral.htm   (922 words)

 Green Tourmaline
Tourmaline is a virtually unique colour miracle : this gemstone exists in red and green, blue and yellow, and even in colourless and fl respectively.
Tourmaline is loved as a perfect jewellery stone by many women, but it has also come to be preferred nowadays by quite a few men.
Tourmalines are found almost everywhere on the globe as small and usually dark crystals.
www.gemstone.org /gem-by-gem/english/green_tourmaline.html   (702 words)

However, the name "Tourmaline” has been derived from the Singhalese expression "tura mali”, which translates as "stone of mixed colours.” The very name already refers to the unique spectrum of colours displayed by this gemstone, which is second to none in the realm of precious stones.
Tourmalines are red and green, range from blue to yellow.
Tourmaline is a very special stone indeed and holds an outstanding position in the fascinating world of gemstones.
www.gemstone.org /gem-by-gem/english/tourmaline.html   (852 words)

 Tourmaline   (Site not responding. Last check: 2007-10-22)
Tourmaline derives its name from the Singalese word tourmali, which means "mixed stones." Ruby, sapphire, peridot and spinel have all been found together in the gravel of localities such as Sri Lanka and Burma.
Tourmaline is a complex silicate of Boron and Aluminum.
Tourmaline absorbs light along the c-axis of the crystal and if the table is perpendicular to that axis, the stone will develop a very dark body color.
csd.unl.edu /Birthstones/tourmaline.asp   (707 words)

 Gemstones - Tourmaline
Tourmaline seems to have a special place in the hearts of mineral collectors as well as in that of gem and gemstone enthusiasts.
Tourmaline can be colorless to just about any color, hue, or tone known to man. And if range of colors among different tourmalines is not enough, individual crystals can vary in color along their length or in cross-section.
The mines ability to yield large quantities of quality tourmaline was clearly demonstrated by Plumbago Mining Corp. The company reported that from October 1972 until the Fall of 1974, it produced more than one metric ton of fine-quality tourmaline.
minerals.usgs.gov /minerals/pubs/commodity/gemstones/sp14-95/tourmaline.html   (968 words)

 Tourmaline: A Crystal for the Millennium
In their natural state tourmalines are characterized by parallel ridges (or striations) which run the length of the crystal.
Tourmaline aids in clarity by helping us to move beyond limited ways of thinking in order to embrace a greatly expanded concept of reality.
Pink tourmaline (whose actual color ranges from a deep red - hence the name rubellite - to a pale pink) is part of the triad of heart stones which also includes rose quartz and kunzite.
www.rainbowcrystal.com /crystal/gems/tourm.html   (410 words)

 Thaigem.com – Tourmaline, Pink Tourmaline, Paraiba Tourmaline, Tourmaline Crystal, Green Tourmaline, Tourmaline ...
Many refer to tourmaline as the "muses' stone", for they believe that its imaginative colors contain inspirational powers which enable the mind of its beholder to bring forth illimitable vision and creativity.
Tourmaline earrings, tourmaline necklaces, tourmaline rings and other types of tourmaline jewelry are all well-suited to everyday wear and with its relatively affordable price and the variety of colors available, tourmaline is the perfect gem for those who like to showcase a variety of exquisite jewels.
Tourmaline is available in all sizes ranging from small to over 100 carats; however, stones of a rare color are often found only in smaller sizes.
www.thaigem.com /dis_tourmaline.asp   (493 words)

Tourmaline is very abundant and has the best-developed crystals in pegmatites and in metamorphosed limestones in contact with granitic magmas.
Another peculiarity of tourmaline is that crystal when heated acquires an electric charge and attracts small objects such as hair or small pieces of paper.
In addition to its use as a gem, tourmaline is employed in pressure devices because of its piezoelectric properties.
www.semiprecious.com /TOURMALINE.htm   (346 words)

 Tourmaline - Information about Tourmaline
Tourmaline forms as a trigonal crystal in a variety of geological settings; as an associated mineral in metamorphic rocks as gneiss or schists, as long prisms in granitic pegmatites usually with a feldspar matrix, or as single crystals after alteration of the pegmatite resulting, for example, in kaolinisation.
Other occurrences for tourmaline are in hydrothermal veins where heated mineral bearing liquids or gases from deep igneous sources later cooled and crystallized along rock fractures, in granites due to late stage alteration of micas and feldspars by boron containing fluids, and by boron metasomatism in contact and regionally metamorphosed rocks.
Because of tourmaline's relatively high hardness and specific gravity, it is often found in elluvial and alluvial deposits as for example in the gravels of Mogok in Burma or in those of Sri Lanka.
www.gemwow.com /category_info.php?cat2=301   (469 words)

 Tourmaline Buying Guide
One of the more distinctive features of tourmaline is its strong pleochroism, with the ordinary ray color (the color seen parallel to the c-axis) being deeper than that of the extraordinary ray.
Tourmalines of lighter color are typically oriented with the table facet perpendicular to the c-axis, to display the richest color possible.
In summary, tourmaline is a complex aluminum boro-silicate, with heavy emphasis on the “complex.” One pundit likened it more to a medieval alchemist’s brew than a respectable mineral species.
www.palagems.com /tourmaline_buyers_guide.htm   (1133 words)

 Tourmaline Information and Education - Zales
Known as the "Rainbow Gemstone", tourmaline comes in every color of the rainbow and most tourmaline gemstones are multi-colored.
Tourmaline is reputed to have a powerful positive influence on love and friendship.
With a Mohs' hardness rating of 7 to 7.5, tourmaline is a very durable and easy to maintain gemstone perfect for everyday wear.
www.zales.com /jewelry101/index.jsp?page=gemstones_Tourmaline   (91 words)

 Tourmaline FAQ
Tourmaline is a relatively hard (7.0 Mohs' hardness) gemstone, consisting of borosilicates of aluminum, sodium and magnesium.
Tourmaline is one of the most diversely colored of all gems and minerals - occurring in nearly every color imaginable.
A: "Watermelon Tourmaline" is a term used to describe the unique tourmaline crystals found in Newry, Maine by the Plumbago Mining Corp. These crystals had the curious property of having a green outer "skin" and a deep, reddish pink "core" - hence the term "Watermelon" [Photo].
www.megalink.net /~mtmica/tourmaline_facts.html   (462 words)

 Amethyst Galleries - TOURMALINE GROUP
Tourmalines are cut as precious gems, carved into figurines, cut as cabochons, sliced into cross-sections and natural specimens are enthusiastically added to many a rock hound's collection.
The two other more common tourmalines; dravite and uvite are much less common than elbaite or schorl, but they are getting noticed for their beautiful specimens.
Uvite is a green translucent to opaque tourmaline that is growing in popularity and is being cut as a gemstone.
mineral.galleries.com /minerals/silicate/tourmali.htm   (498 words)

 Tourmaline - nature's source of infrared and negative ions
The reason - infrared Tourmaline is the only one mineral to show permanent electricity on the earth and is also a natural (non-manufactured) source of negative ions and far infrared (FIR) rays.
Tourmaline, in your filter, is used to naturally transform water into mild alkaline water, reduce water clustering (what happens to our stored water) and has anti-bacterial and deodorant qualities.
In addition, Tourmaline generates FIR that purifies the water, and acts like a 'supercharger', assisting the water alkalizer to ionize and alkalize.
www.ionizers.org /tourmaline.html   (692 words)

 Tourmaline   (Site not responding. Last check: 2007-10-22)
Tourmaline, with its rainbow mixture of colors, takes its name from the ancient Sinhalese word turmali which means "mixed gems".
Tourmaline was believed to promote high energy, tranquil sleep, balance in relationships, self- expression, peace, joy, compassion, protection, and a healthy environment, dispelling fear, grief, negativity, and compulsiveness.
Green tourmaline is designated for the 10th wedding anniversary and pink for the 17th.
www.tavernays.com /tourmaline.html   (127 words)

 SDNHM - Tourmaline
Tourmaline crystal is shaped like a prism and has lengthwise ridges.
A delightful example of coloration is the watermelon tourmaline; it typically changes from red to green in a concentric color zonation, i.e., from the center out.
Black tourmaline is the most common variety and is often mistaken for another common mineral, hornblende.
www.sdnhm.org /fieldguide/minerals/tourmaline.html   (241 words)

 TOURMALINE: Factsheet & Information Page - MINERALMINERS.COM
Tourmaline is the name given to a group of related minerals all having essentially the same crystal structure but varying considerably in chemical composition and in some of their physical properties.
Other occurances for tourmaline are: with quartz in hydrothermal veins where heated mineral bearing liquids or gases from deep igneous sources later cooled and crystallized along rock fractures, in granites due to late stage alteration of micas and feldspars by boron containing fluids, and by boron metasomatism in contact and regionally metamorphosed rocks.
Tourmaline also has many scientific and technological uses due to the fact that an electrical charge can be induced in some tourmaline crystals simply by applying pressure to the crystal in the direction of the vertical crystal axis.
www.mineralminers.com /html/touminfo.htm   (1107 words)

 Tourmaline Crystals
Tourmaline crystals are hexagonal, prismatic crystals that commonly have a rounded triangular cross section, striated lengthwise.
Tourmaline may be found in Brazil, Russia, Burma, Afghanistan, Malagasy Republic, Maine, California.
Rough opaque tourmaline crystals in a pastel green on the outside, pastel pink color on the inside.
www.bestcrystals.com /tourmaline.html   (410 words)

 Tourmaline   (Site not responding. Last check: 2007-10-22)
Tourmaline can be found in a variety of colors - colorless, yellow, brown, red to pink, green, dark green, blue and fl - so much that there is a saying that "all colors on an artists palate look like tourmaline".
Tourmaline became widely known in the world quite recently in the 16th century when it was found in large quantities in Brazil.
Tourmaline is group of mineral species including elbaite, liddicoatite, uvite, dravite, buergerite, olenite, and schorl.
www.suevematsu.com /tourmaline.html   (571 words)

 The Collector
Tourmaline is the name for a group of related mineral species.
Tourmaline is a pegmatite mineral and so is mined from the world’s great pegmatite districts.
Tourmaline has never been synthesized, but a number of imitations exist, including natural stones and man-made imitations such as glass.
www.collectorfinejewelry.com /buyers_guide_tourmaline.htm   (1049 words)

 eBay Guides - Investment Tourmaline Gemstones
Investing in tourmaline is made much easier by the lack of lab imitations, although glass is sometimes sold to the unwary.
The name "Tourmaline” is derived from the Singhalese expression "tura mali”, which translates as "stone of mixed colors.” The very name already refers to the fantastic color range displayed by this gem, which is second to none in the realm of precious stones.
Tourmalines are mixed crystals of complex aluminum-borosilicate varying in their composition.
reviews.ebay.com /Investment-Tourmaline-Gemstones_W0QQugidZ10000000000963177   (1021 words)

 tourmaline - HighBeam Encyclopedia
TOURMALINE [tourmaline], complex borosilicate mineral with varying amounts of aluminum, iron, magnesium, sodium, lithium, potassium, and sometimes other elements, used as a gem.
Tourmalines are found in pegmatite veins in granites, gneisses, schists, and crystalline limestone.
Tourmaline discovery at the Cryo-Genie mine: San Diego County California.
www.encyclopedia.com /html/t/tourmali.asp   (365 words)

 Tourmaline (DesertUSA)
Tourmalines are abundant, complex boron and aluminum silicate minerals of variable composition.
The best-developed tourmaline crystals are found in pegmatites and metamorphosed limestones in contact with granitic magmas, as well as certain sedimentary deposits.
Tourmaline forms slender, 3-, 6-, or 9-sided prismatic crystals (hexagonal system) in parallel or radiating groups, which causes it to develop an electrical charge when heated or deformed.
www.desertusa.com /mag98/may/papr/geo_tourmaline.html   (209 words)

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