Madagascar Minerals®
SITE MAP | ADVANCED SEARCH | PRODUCT SEARCH
 
     
 
ORDERING | TRACK ORDER | ON SALE | WHOLESALE | CATALOG | CONTACT US
1-520-882-8884  
 
     
 
Login Register
My Account Shopping Cart Wishlist
 
Museum Gallery    
Gem Decor    
Gem Decor Rough    
Gemstone Bottle Stoppers    
Ammonite Fossils    
Spheres    
Tumbling Rough    
Tumbled Stones    
Animal Carvings    
Freeform Shapes    
Carvings    
Crystals    
Display Specimens    
Eggs    
Fetish Shapes    
Fossils    
Gemstone Tabletops    
Gemstone Tiles    
Gemstone Sinks    
Hearts    
Jewellery Products    
Massage Tools    
Plaques    
Polished Specimens    
Rough Minerals and Gems from Madagascar    
Slices    
AGATE    
AMAZONITE    
AMETHYST    
AMETHYST BANDED    
APATITE    
BLUE AGATE    
BLUE CALCITE    
BLUE QUARTZ    
CARNELIAN    
CELESTITE    
CHESTNUT JASPER    
CHRYSOCOLLA    
COPAL    
CORUNDUM    
CROCODILE JASPER    
DESERT JASPER    
FIRE QUARTZ    
INDIGO GABBRO    
GIRASOL OPAL    
HEMATITE    
LABRADORITE    
OPTICAL CALCITE    
ORANGE CALCITE    
ORBICULAR JASPER    
PETRIFIED WOOD    
QUARTZ    
RHODONITE    
ROSE QUARTZ    
SEPTARIAN    
TOURMALINE    
YELLOW JASPER    
ZEBRADORITE    
Healing Birthstones For Energy and Metaphysical Uses    
Apatite Blue Gem AA 5LBS    
Fire Quartz Sphere (60mm)    
Agate Spheres (60mm)    
Carnelian Sphere (50mm)    

Tourmaline

Tourmaline
Tourmaline is a crystal silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline is classified as a semi-precious stone and the gem comes in a wide variety of colors. The name comes from the Sinhalese word "Thuramali" or "Thoramalli" , which applied to different gemstones found in Sri Lanka..  This gemmy Green Tourmaline is translucent and has a lovely color and vibration.  These Tourmaline crystals formed in elongated crystals with striations on the side of the crystal, making them great for enhancing the flow of energy.

Green Tourmaline can attract money and success by opening the Heart Chakra to one's inner truth, enabling one to reach for their true desires.  In addition, Green Tourmaline helps to attract prosperity by connecting one to the cycles of the Earth, helping to bring one into the natural flow of life.  Green Tourmaline can help one to connect with the nature spirits.  Green Tourmaline is often used with the Heart Chakra, to promote strength, courage, and vitality, and to encourage a state of allowing.

Like all Tourmalines, Green Tourmaline is a metaphysically protective stone which is said to balance and harmonize the Chakras.  These gemmy Green Tourmaline chips are ideal for healing purposes as they can focus their healing energies, clearing the aura and removing blockages.  Meditating with Green Tourmaline can enhance mature emotional development by pulling higher vibrational frequencies in through the Third-Eye Chakra, to be processed in the Heart Chakra.

All Tourmaline is thought to balance the left and right hemispheres of the brain, and the male and female energies.  Tourmalines encourage healing and grounding of energies.   Working with Tourmalines in a body layout can balance the Chakras and stabilize the aura.  Physically, Green Tourmaline can help with ailments of the heart and immune system, and promotes general good health.

History
Brightly colored Sri Lankan gem tourmalines were brought to Europe in great quantities by the Dutch East India Company to satisfy a demand for curiosities and gems. At the time it was not realised that schorl and tourmaline were the same mineral.

Tourmaline species and varieties
Dravite species: from the Drave district of Carinthia
Dark yellow to brownish black�dravite
Schorl species:
Bluish or brownish black to Black�schorl
Elbaite species: named after the island of Elba, Italy
Rose or pink�rubellite variety (from ruby)
Dark black�schorl (from indigo)
Light blue to bluish green�Brazilian indicolite variety
Green�verdelite or Brazilian emerald variety
Colorless�achroite variety (from the Greek "άχρωμος" meaning "colorless")
Schorl
The most common species of tourmaline is schorl. It may account for 95% or more of all tourmaline in nature. The early history of the mineral schorl shows that the name "schorl" was in use prior to 1400 because a village known today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or minor variants of this name). This village had a nearby tin mine where, in addition to cassiterite, black tourmaline was found. The first description of schorl with the name "sch�rl" and its occurrence (various tin mines in the Saxony Ore Mountains) was written by Johannes Mathesius (1504�1565) in 1562 under the title "Sarepta oder Bergpostill".[3] Up to about 1600, additional names used in the German language were "Schurel", "Sch�rle", and "Schurl". Beginning in the 18th century, the name Sch�rl was mainly used in the German-speaking area. In English, the names shorl and shirl were used in the 18th century. In the 19th century the names common schorl, sch�rl, schorl and iron tourmaline were used in the Anglo-Saxon area.[3] The word tourmaline has two etymologies, both from the Sinhalese word turamali, meaning "stone attracting ash" (a reference to its pyroelectric properties) or according to other sources "mixed gemstones".

Dravite

Black Dravite on a grey matrixThe name dravite was used for the first time by Gustav Tschermak (1836�1927), Professor of Mineralogy and Petrography at the University of Vienna, in his book Lehrbuch der Mineralogie (published in 1884) for magnesium-rich (and sodium-rich) tourmaline from the village Unterdrauburg, Drava river area, Carinthia, Austro-Hungarian Empire. Today this tourmaline locality (type locality for dravite) at the village Dravograd (near Dobrova pri Dravogradu), is a part of the Republic of Slovenia.[4] Tschermak gave this tourmaline the name dravite, for the Drava river area, which is the district along the Drava River (in German: Drau, in Latin: Drave) in Austria and Slovenia. The chemical composition which was given by Tschermak in 1884 for this dravite approximately corresponds to the formula NaMg3(Al,Mg)6B3Si6O27(OH), which is in good agreement (except for the OH content) with the endmember formula of dravite as known today.[4]

Elbaite
A lithium-tourmaline (elbaite) was one of three pegmatitic minerals from Ut�, Sweden, in which the new alkali element lithium (Li) was determined in 1818 by Arfwedson for the first time.[5] Elba Island, Italy, was one of the first localities where colored and colorless Li-tourmalines were extensively chemically analysed. In 1850 Rammelsberg described fluorine (F) in tourmaline for the first time. In 1870 he proved that all varieties of tourmaline contain chemically bound water. In 1889 Scharitzer proposed the substitution of (OH) by F in red Li-tourmaline from Su�ice, Czech Republic. In 1914 Vernadsky proposed the name Elbait for lithium-, sodium-, and aluminum-rich tourmaline from Elba Island, Italy, with the simplified formula (Li,Na)HAl6B2Si4O21.[5] Most likely the type material for elbaite was found at Fonte del Prete, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy.[5] In 1933 Winchell published an updated formula for elbaite, H8Na2Li3Al3B6Al12Si12O62, which is commonly used to date written as Na(Li1.5Al1.5)Al6(BO3)3[Si6O18](OH)3(OH).[5] The first crystal structure determination of a Li-rich tourmaline was published in 1972 by Donnay and Barton, performed on a pink elbaite from San Diego County, California, USA

**Tourmaline has a variety of colors. Usually, iron-rich tourmalines are black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are almost any color: blue, green, red, yellow, pink etc. Rarely, it is colorless. Bi-colored and multicolored crystals are common, reflecting variations of fluid chemistry during crystallisation. 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. Some forms of tourmaline are dichroic, in that they change color when viewed from different directions.

Treatments
Some tourmaline gems, especially pink to red colored stones, are altered by irradiation to improve their color. Irradiation is almost impossible to detect in tourmalines, and does not impact the value. Heavily-included tourmalines, such as rubellite and Brazilian paraiba, are sometimes clarity enhanced. A clarity-enhanced tourmaline (especially paraiba) is worth much less than a non-treated gem.[7]

Geology
Tourmaline is found in two main geological occurrences. Igneous rocks, in particular granite and granite pegmatite and in metamorphic rocks such as schist and marble. Schorl and lithium-rich tourmalines are usually found in granite and granite pegmatite. Magnesium-rich tourmalines, dravites, are generally restricted to schists and marble. Tourmaline is a durable mineral and can be found in minor amounts as grains in sandstone and conglomerate, and is part of the ZTR index for highly-weathered sediments.


Bi-colored tourmaline crystal, 0.8 inches long (2 cm).[edit] Tourmaline localities
Gem and specimen tourmaline is mined chiefly in Brazil and Africa. Some placer material suitable for gem use comes from Sri Lanka. In addition to Brazil, tourmaline is mined in Tanzania, Nigeria, Kenya, Madagascar, Mozambique, Namibia, Afghanistan, Pakistan, Sri Lanka, and Malawi.[8]

United States
Some fine gems and specimen material has been produced in the United States, with the first discoveries in 1822, in the state of Maine. California became a large producer of tourmaline in the early 1900s. The Maine deposits tend to produce crystals in raspberry pink-red as well as minty greens. The California deposits are known for bright pinks, as well as bicolors. During the early 1900s, Maine and California were the world's largest producers of gem tourmalines. The Empress Dowager Tz'u Hsi of China loved pink tourmaline and bought large quantities for gemstones and carvings from the then new Himalaya Mine, located in San Diego County, California.[9] It is not clear when the first tourmaline was found in California. Native Americans have used pink and green tourmaline as funeral gifts for centuries. The first documented case was in 1890 when Charles Russel Orcutt found pink tourmaline at what later became the Stewart Mine at Pala, San Diego.[10]

Brazil

Watermelon Tourmaline mineral on quartz matrix (crystal approximately 2 cm wide at face)Almost every color of tourmaline can be found in Brazil, especially in the Brazilian states of Minas Gerais and Bahia. In 1989, miners discovered a unique and brightly colored variety of tourmaline in the state of Para�ba. The new type of tourmaline, which soon became known as paraiba tourmaline, came in unusually vivid blues and greens. These colors were often described as "neon" since they appeared to glow. Brazilian paraiba tourmaline is usually heavily included. Much of the paraiba tourmaline from Brazil actually comes from the neighboring state of Rio Grande do Norte. Material from Rio Grande do Norte is often somewhat less intense in color, but many fine gems are found there. It was determined that the element copper was important in the coloration of the stone.

Africa
In the late 1990s, copper-containing tourmaline was found in Nigeria. The material was generally paler and less saturated than the Brazilian materials, although the material generally was much less included. A more recent African Discovery from Mozambique has also produced beautiful tourmaline colored by copper, similar to the Brazilian paraiba. While its colors are somewhat less bright than top Brazilian material, Mozambique paraiba is often less included and has been found in larger sizes. The Mozambique paraiba material usually is more intensely colored than the Nigerian. There is a significant overlap in color and clarity with Mozambique paraiba and Brazilian paraiba, especially with the material from Rio Grande do Norte. While less expensive than top quality Brazilian paraiba, some Mozambique material sells for well over $5,000 per carat, which still is extremely high compared to other tourmalines.

Tourmaline mineral (approximately 10 cm tall)Another highly valuable variety is chrome tourmaline, a rare type of dravite tourmaline from Tanzania. Chrome tourmaline is a rich green color due to the presence of chromium atoms in the crystal; chromium also produces the green color of emeralds. Of the standard elbaite colors, blue indicolite gems are typically the most valuable, followed by green verdelite and pink to red rubellite.[citation needed] There are also yellow tourmalines, sometimes known as canary tourmaline. Zambia is rich in both red and yellow tourmaline, which are relatively inexpensive in that country. Ironically the rarest variety, colorless achroite, is not appreciated and is the least expensive of the transparent tourmalines.

Afghanistan
In the Nuristan region (Ghazi Abad district) and Pech Valley (Pech and Chapa Dara districts) of Kunar province extra fine Indicolite (blue tourmaline) and Verderite (green tourmaline) are found. Gem quality Tourmaline are faceted (cut) from 0.50-10 gram sizes and have unusually high clarity and intense shades of color


Physical and Metaphysical Properties for Tourmaline

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. The style of termination at the ends of crystals is asymmetrical, called hemimorphism. Small slender prismatic crystals are common in a fine-grained granite called aplite, often forming radial daisy-like patterns. Tourmaline is distinguished by its three-sided prisms; no other common mineral has three sides. Prisms faces often have heavy vertical striations that produce a rounded triangular effect. Tourmaline is rarely perfectly euhedral. An exception was the fine dravite tourmalines of Yinnietharra, in western Australia. The deposit was discovered in the 1970s, but is now exhausted. All hemimorphic crystals are piezoelectric, and are often pyroelectric as well

Category: Silicate mineral group
Primary Chakra: Heart
Identification: Crystal habit Parallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite).
Crystal System: Trigonal
Chemical formula: Na(Li,Al)3Al6Si6O18(BO3)3 (OH)4, Sodium Lithium Aluminum Boro-Silicate, (Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6
(BO3)3(Si,Al,B)6O18(OH,F)4
Compostion: Hydroxide
Astrological Sign: Capricorn
Numerical Vibration: 6
Hardness: 7 to 7.5
Color: Most commonly black, but can range from brown, violet, green, pink, or in a dual-colored pink and green.
Red Tourmaline: Definite; dark red,light red
Green Tourmaline: Strong; dark green, yellow-green
Brown Tourmaline: Definite; dark brown, light brown
Blue Tourmaline: Strong; dark blue, light blue
Fracture Uneven, small conchoidal, brittle
Mohs scale hardness 7�7.5
Luster Vitreous, sometimes resinous
Streak White
Specific gravity: 3.06 (+.20 -.06)
Density: 2.82�3.32
Polish luster Vitreous
Optical properties: Double refractive, uniaxial negative
Refractive index: nω=1.635�1.675, nε=1.610�1.650
Birefringence -0.018 to -0.040; typically about .020 but in dark stones it may reach .040
Pleochroism typically moderate to strong
Ultraviolet fluorescence pink stones�inert to very weak red to violet in long and short wave
Absorption spectra a strong narrow band at 498nm, and almost complete absorption of red down to 640nm in blue and green stones; red and pink stones show lines at 458 and 451nm as well as a broad band in the green spectrum
Cleavage: Indistinct
Location: Brazil, Italy, Pakistan, Russia, Sri Lanka, USA, Madagascar.
Rarity: Common
Pronunciation: Green Tour-muh-leen / black tour - mun-lin




Back to Metaphysical and Physical Guide


Sources:

healingcrystals.com, wikipedia.org

See Our Shopping Guarantee
See Our FAQ
Customer Testimonials
Read Our Privacy Policy
Press Releases
Madagascar Minerals Club
Investor Relations
View Our Trade Show Schedule
Denver Gem Show 2017
Tucson Gem Show 2018
Mining Properties
Visit our Factory
Norcross Schools
Visit our Gallery
Visit Madagascar
Career Opportunities
Copyright & Trademark Disclaimer
Metaphysical Guide to our Stones
Physical Properties of our Stones