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
Birthstone Stud Earrings - October
Expertly crafted of sterling silver, then bathed in 14kt gold, these classic stud earrings shimmer with the genuine pink tourmaline birthstone. Treat yourself or delight a special someone with a precious gift that celebrates her unique personality....Only $87.00 at Danbury Mint
no photoBirthstone Stud Earrings - October
$87.00
Danbury Mint
Large Black Tourmaline Bib Necklace - Kendra Scott Luxe
18-karat yellow gold-plated brass. 7 black tourmaline oval facets shape bib. Pave cubic zirconia. Serpentine chain necklace. Fold-over clasp. 18 1/2inL. Please note: Due to the unique nature of the medium, every Kendra Scott LUXE piece is one-of-a-kind...Only $550.00 at Neiman Marcus
no photoLarge Black Tourmaline Bib Necklace - Kendra Scott Luxe
$550.00
Neiman Marcus
Sterling Silver Multi-Color Tourmaline Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $160.49 at JeGem.com
no photoSterling Silver Multi-Color Tourmaline Ring Jewelry
$160.49
JeGem.com
Sterling Silver White Topaz, Rubellite Tourmaline Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $218.24 at JeGem.com
no photoSterling Silver White Topaz, Rubellite Tourmaline Ring Jewelry
$218.24
JeGem.com
Ross-Simons 3.70 ct. t.w. Multi-Stone Ring in 14kt Gold Over Sterling
A vibrant spectrum of color brings this ring to life. 3.70 ct. t.w. of cushion-cut garnet, blue topaz, peridot, pink tourmaline, amethyst, and citrine all come together in a multicolored channel. 14kt yellow gold over sterling silver ring. Garnet...Only $155.00 at Ross-Simons
no photoRoss-Simons 3.70 ct. t.w. Multi-Stone Ring in 14kt Gold Over Sterling
$155.00
Ross-Simons
Sterling Silver Dravite Tourmaline Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $196.49 at JeGem.com
no photoSterling Silver Dravite Tourmaline Ring Jewelry
$196.49
JeGem.com
Large Branch-Bezel Black Tourmaline Ring - Kendra Scott Luxe
18-karat yellow gold-plated brass. Faceted black tourmaline center set in branch bezel, detailed with cubic zirconia. Multi-branch band. 1 1/2inL x 1inW. Please note: Due to the unique nature of the medium, every Kendra Scott LUXE piece is...Only $195.00 at Neiman Marcus
no photoLarge Branch-Bezel Black Tourmaline Ring - Kendra Scott Luxe
$195.00
Neiman Marcus
Sterling Silver White Topaz, 2.40 ct. t.w. Rubellite Tourmaline Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $386.24 at JeGem.com
no photoSterling Silver White Topaz, 2.40 ct. t.w. Rubellite Tourmaline Ring Jewelry
$386.24
JeGem.com
Sterling Silver CZ, Multi-Color Tourmaline Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $203.24 at JeGem.com
no photoSterling Silver CZ, Multi-Color Tourmaline Ring Jewelry
$203.24
JeGem.com
Fleurs De Psydelic Yellow-Gold Earrings - Baccarat
Yellow-gold mordore tourmaline crystal. Rhodium-plated sterling silver 1.5mm Forcat chain. Hallmark on back of setting. ALPA device fastenings. 2.25in x 0.5in.Only $405.00 at Neiman Marcus
no photoFleurs De Psydelic Yellow-Gold Earrings - Baccarat
$405.00
Neiman Marcus
Sterling Silver Multi-Color Tourmaline Pendant Jewelry
This Pendant was handmade by a master artisan and is one of a kind.Only $76.49 at JeGem.com
no photoSterling Silver Multi-Color Tourmaline Pendant Jewelry
$76.49
JeGem.com
Fleurs De Psydelic Yellow-Gold Tourmaline Crystal Necklace, Large - Baccarat
Necklace is an original design from the delicate Fleurs De Psydelic Collection. Handcrafted in France. Yellow-gold mordore tourmaline crystal. Rhodium-plated sterling silver 2mm Forcat chain. Fastens with snap clasp. Baccarat signature and hallmark on...Only $380.00 at Neiman Marcus
no photoFleurs De Psydelic Yellow-Gold Tourmaline Crystal Necklace, Large - Baccarat
$380.00
Neiman Marcus
Sterling Silver White Topaz, Rubellite Tourmaline Solitaire Ring Jewelry
This Ring was handmade by a master artisan and is one of a kind.Only $413.24 at JeGem.com
no photoSterling Silver White Topaz, Rubellite Tourmaline Solitaire Ring Jewelry
$413.24
JeGem.com
Brooch/Pendant Necklace with Multicolor Stones, 36" Chain - Dina Mackney
Dina Mackney necklace in 22-karat yellow gold vermeil. Cross-shaped pendant with satin finish features kyanite, tourmaline, apatite, green onyx, and sleeping beauty turquoise cabochons. Pendant with small bar pin may be removed and worn as a brooch on...Only $595.00 at Neiman Marcus
no photoBrooch/Pendant Necklace with Multicolor Stones, 36" Chain - Dina Mackney
$595.00
Neiman Marcus
Large Pave-Trim Black Tourmaline Drop Earrings - Kendra Scott Luxe
18-karat yellow gold-plated brass. Faceted black tourmaline drops. Pave cubic zirconia trim and hook fronts. 2 1/2inL x 1 1/5inW. French wire backs. Please note: Due to the unique nature of the medium, every Kendra Scott LUXE piece is one-of-a-kind and...Only $250.00 at Neiman Marcus
no photoLarge Pave-Trim Black Tourmaline Drop Earrings - Kendra Scott Luxe
$250.00
Neiman Marcus

Popular Members of the Silicates Class








s


 


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