SCHORL

The
Tourmaline Group
of Minerals

DRAVITE


ELBAITE

UVITE


ELBAITE

  Like: Share:  

For natural tourmaline mineral specimens, select any of the mineral names above.

For Tourmaline Jewelry, see --> TOURMALINE JEWELRY

Most people consider tourmaline to be a single mineral. But in fact it is a group named for several different, but closely related minerals. Members of the Tourmaline Group are favorites among mineral collectors. Their rich and varied colors can captivate the eye. Even the black opaque tourmalines can shine nicely and produce sharp crystal forms. 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.

There are many unique properties of tourmalines. First, they are piezoelectric which means that when a crystal is heated or compressed (or vibrated) a different electrical charge will form at opposite ends of the crystal (an electrical potential). Conversely if an electrical potential is applied to the crystal, it will vibrate. Secondly they are pleochroic which means that the crystal will look darker in color when viewed down the long axis of the crystal than when viewed from the side. This property goes beyond the idea that the crystal is just thicker in that direction. Even equally dimensioned crystals will demonstrate this trait. This property can be used as an advantage by gem cutters who may wish to enhance a crystal's pale color or weaken a strongly colored crystal.

The four most common and well known tourmalines are distinguished by their color and transparencies. Elbaite is the gemstone tourmaline and comes in many varied and beautiful colors. It is transparent to translucent and is highly prized as minerals specimens and as gemstones. Elbaite is easily the most colorful of all the gemstones.

The iron rich schorl is the most abundant tourmaline and is black and opaque. It is a common accessory mineral in igneous and metamorphic rocks and can form nice crystals. Although too opaque to be used as a gemstone, schorl is used as an ornamental stone when found as inclusions in quartz, a stone is called "tourmalinated quartz". Usually when someone refers to tourmaline they are referring to either elbaite or schorl.

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. Some of dravite's crystals are nicely formed, translucent brown and they can reach a rather large size. Uvite is a green translucent to opaque tourmaline that is growing in popularity and is being cut as a gemstone.

The Tourmaline Group has a general formula of AX3Y6(BO3)3 Si6O18(O, OH, F)4. The A can be either calcium or sodium. The X can be either aluminum, iron, lithium or magnesium. The Y is usually aluminum, but can also be chromium or iron. Some potassium can be in the A position, some manganese can be in the X position and some vanadium can be found in the Y position, but these elements are usually not represented in the formulas of the tourmaline members.

    These are the members of the Tourmaline Group of minerals:

  • Buergerite (Sodium Iron Aluminum Boro-silicate Hydroxide Fluoride)
  • Chromdravite (Sodium Magnesium Chromium Iron Aluminum Boro-silicate Hydroxide Fluoride)
  • Dravite (Sodium Magnesium Aluminum Boro-silicate Hydroxide)
  • Elbaite (Sodium Lithium Aluminum Boro-silicate Hydroxide)
  • Feruvite (Calcium Iron Magnesium Aluminum Boro-silicate Hydroxide)
  • Foitite (Iron Aluminum Boro-silicate Hydroxide)
  • Liddicoatite (Sodium Lithium Aluminum Boro-silicate Oxide Hydroxidem Fluoride)
  • Olenite (Sodium Aluminum Boro-silicate Oxide Hydroxide)
  • Povondravite (Sodium Iron Boro-silicate Hydroxide Oxide)
  • Schorl (Sodium Iron Aluminum Boro-silicate Hydroxide)
  • Uvite (Calcium Sodium Magnesium Iron Aluminum Boro-silicate Hydroxide Fluoride)
ELBAITE

INDICOLITE
a variety of
ELBAITE

DRAVITE

ELBAITE

UVITE

ELBAITE IN QUARTZ

See Our Tourmaline Specimens of
Dravite - Elbaite
 Indicolite
Schorl - Uvite

Amethyst Galleries sells natural mineral specimens, including precious metals and gemstones. For Fine Jewelry, please visit

Tourmaline Jewelry - Hover over an item for more information
Round Green Tourmaline Sterling Silver Vintage-Inspired Ring with Emerald & Alexandrite - Venus Band
Scalloped shells form a fluted pattern on each side of this feminine tapered band, carefully handcrafted in your choice of gems and metals.Only $240.00 at Gemvara
no photoRound Green Tourmaline Sterling Silver Vintage-Inspired Ring with Emerald & Alexandrite - Venus Band
$240.00
Gemvara
Round Red Garnet Sterling Silver Vintage-Inspired Ring with Pink Tourmaline & Amethyst - Venus Band
Scalloped shells form a fluted pattern on each side of this feminine tapered band, carefully handcrafted in your choice of gems and metals.Only $205.00 at Gemvara
no photoRound Red Garnet Sterling Silver Vintage-Inspired Ring with Pink Tourmaline & Amethyst - Venus Band
$205.00
Gemvara
Round Pink Tourmaline Sterling Silver Ring - Birds of a Feather Ring
This lovely sensuous feather ring can be worn with the gem in front or in back, depending on your mood.Only $180.00 at Gemvara
no photoRound Pink Tourmaline Sterling Silver Ring - Birds of a Feather Ring
$180.00
Gemvara
Sterling Silver Mother's Necklace with Pink Tourmaline - Yin Yang Heart
Two halves of a whole, yin and yang, opposites that attract, this heart pendant represents the union of two into one. Customize with birthstones to make a romantic statement of you complete me."Only $205.00 at Gemvara
no photoSterling Silver Mother's Necklace with Pink Tourmaline - Yin Yang Heart
$205.00
Gemvara
Round Pink Tourmaline Sterling Silver Promise Ring with Amethyst - Written in the Stars Ring
Two glittering gemstones and numerous star etchings rest atop the hollowed upper band of this gleaming ring, designed for the stargazers among us.Only $215.00 at Gemvara
no photoRound Pink Tourmaline Sterling Silver Promise Ring with Amethyst - Written in the Stars Ring
$215.00
Gemvara
Round Pink Tourmaline 14K Rose Gold Promise Ring - Petite Claddagh Ring
A petite version of the traditional Irish Claddagh Ring. This ring is given as a token of love or marriage and is carefully handcrafted in your choice of gems and metals.Only $300.00 at Gemvara
no photoRound Pink Tourmaline 14K Rose Gold Promise Ring - Petite Claddagh Ring
$300.00
Gemvara
Round Amethyst Sterling Silver Vintage-Inspired Ring with Red Garnet & Pink Tourmaline - Venus Band
Scalloped shells form a fluted pattern on each side of this feminine tapered band, carefully handcrafted in your choice of gems and metals.Only $205.00 at Gemvara
no photoRound Amethyst Sterling Silver Vintage-Inspired Ring with Red Garnet & Pink Tourmaline - Venus Band
$205.00
Gemvara
Round Green Tourmaline Sterling Silver Vintage-Inspired Ring with Emerald & Citrine - Venus Band
Scalloped shells form a fluted pattern on each side of this feminine tapered band, carefully handcrafted in your choice of gems and metals.Only $220.00 at Gemvara
no photoRound Green Tourmaline Sterling Silver Vintage-Inspired Ring with Emerald & Citrine - Venus Band
$220.00
Gemvara
Opal, 2.50ct t.w. Pink Tourmaline Pendant Necklace, White Topaz Over Sterling. 18"
This pendant necklace exudes a dreamy look with an oval opal wrapped by 2.50 ct. t.w. round pink tourmalines and .55 ct. t.w. round white topaz. Suspends from a rope chain with a springring clasp. 14kt rose gold over sterling silver pendant necklace....Only $123.75 at Ross-Simons
no photoOpal, 2.50ct t.w. Pink Tourmaline Pendant Necklace, White Topaz Over Sterling. 18"
$123.75
Ross-Simons
Round Green Tourmaline Sterling Silver Vintage-Inspired Ring with Ruby & Yellow Sapphire - Venus Band
Scalloped shells form a fluted pattern on each side of this feminine tapered band, carefully handcrafted in your choice of gems and metals.Only $215.00 at Gemvara
no photoRound Green Tourmaline Sterling Silver Vintage-Inspired Ring with Ruby & Yellow Sapphire - Venus Band
$215.00
Gemvara
Round Alexandrite Sterling Silver Mother's Ring with Rhodolite Garnet & Green Tourmaline - Liana Ring with Three Gems
This lovely leafy vine ring twines across the finger while brilliant gems bloom among the leaves.Only $230.00 at Gemvara
no photoRound Alexandrite Sterling Silver Mother's Ring with Rhodolite Garnet & Green Tourmaline - Liana Ring with Three Gems
$230.00
Gemvara
Branch-Bezel Black Tourmaline Pendant Necklace - Kendra Scott Luxe - Black
Kendra Scott LuxeBranch-Bezel Black Tourmaline Pendant NecklaceDetails18-karat yellow gold-plated brass.Faceted black tourmaline pendant set in branch bezel, detailed with cubic zirconia.Double-strand serpentine chain necklace with lobster...Only $275.00 at Neiman Marcus
no photoBranch-Bezel Black Tourmaline Pendant Necklace - Kendra Scott Luxe - Black
$275.00
Neiman Marcus
Sterling Silver Promise Ring with Pink Tourmaline & Rhodolite Garnet - Two Hearts Ring
Two hearts meet in one simply perfect ring style. Create this style in your birthstones to add extra meaning.Only $220.00 at Gemvara
no photoSterling Silver Promise Ring with Pink Tourmaline & Rhodolite Garnet - Two Hearts Ring
$220.00
Gemvara
Sterling Silver Necklace with Pink Tourmaline - Glorious Heart Cross
Exult in the glory of beauty and serenity in this graceful design, which cradles one symbolic gem in its center.Only $170.00 at Gemvara
no photoSterling Silver Necklace with Pink Tourmaline - Glorious Heart Cross
$170.00
Gemvara
Round Green Tourmaline Sterling Silver Necklace - Eternal Heart Pendant
Eternal love is beautifully expressed in the infinite line of this heart pendant. Carefully handcrafted in your choice of gems and metals.Only $160.00 at Gemvara
no photoRound Green Tourmaline Sterling Silver Necklace - Eternal Heart Pendant
$160.00
Gemvara

Popular Members of the Silicates Class








s


 


Copyright ©1995-2012 by Amethyst Galleries, Inc.
Site design & programming by galleries.com web services