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THE MINERAL TOPAZ

  • Chemistry: Al 2 SiO 4 (F, OH) 3, Aluminum silicate fluoride hydroxide.
  • Class: Silicates
  • Subclass: Nesosilicates
  • Uses: gemstones and optical properties are useful in industry.
  • For natural topaz mineral specimens see our For Sale or Sold lists
    For Topaz Jewelry, see -->  TOPAZ JEWELRY

Topaz is a common gemstone that has been used for centuries in jewelry. Its golden brown to yellow color is classic but is confused with the less valuable citrine, which is sometimes sold under the name topaz. The blue topaz that is often confused with aquamarine is rarely natural and is produced by irradiating and then heating clear crystals. Golden Topaz is the November Birthstone, and Blue Topaz is an acceptable alternate birthstone for December.

The structure of Topaz is controlled by a chain like structure of connected irregular octahedrons. These octahedrons have an aluminum in the middle surrounded by four oxygens. Above and below the aluminum are the hydroxide or fluoride ions. The chains of octahedrons are held together by individual silicate tetrahedrons but it is the octahedron chains that give topaz its crystalline shape.

Topaz is the hardest silicate mineral and one of the hardest minerals in nature. However it has a perfect cleavage which is perpendicular to the chains and is caused by planes that break the weaker Al-O, Al-OH and Al-F bonds. None of the stronger Si-O bonds cross these planes.

Topaz crystals can reach the incredible size of several hundred pounds. Topaz can make very attractive mineral specimens due to their high luster, nice colors and well formed and multifaceted crystals.

PHYSICAL CHARACTERISTICS:

  • Color is clear, yellow, orange, red, blue and green.
  • Luster is adamantine to vitreous.
  • Transparency crystals are transparent to translucent.
  • Crystal System is orthorhombic; 2/m 2/m 2/m
  • Crystal Habits include a prismatic crystal with usually two different prisms that produce a rounded or sharp diamond-shaped cross-section. The termination is typically capped by a dome forming a roof like top. Another dome can modify the termination producing a point at the juncture of the two domes. A basal pinacoid can flatten the prisms termination or truncate the top of the domes. The pinacoid, multiple domes and occasionally orthorhombic pyramid faces can produce a complex, multifaceted and well formed termination. Topaz can be granular and massive.
  • Cleavage is perfect in one direction, basal.
  • Fracture is conchoidal.
  • Hardness is 8.
  • Specific Gravity is approximately 3.4 - 3.5+ (above average)
  • Streak is white.
  • Associated Minerals include quartz, tourmalines, micas, brookite, cassiterite and fluorite.
  • Other Characteristics: index of refraction is 1.61 - 1.64. Prism faces maybe striated lengthwise.
  • Notable Occurrences include Minas Gerias, Brazil; Pakistan; San Diego Co, California; Ural Mountains, Russia; Mexico and the Thomas Range, Utah.
  • Best Field Indicators are crystal habit, color, density and hardness.
Topaz Jewelry - Hover over an item for more information
8.88 CTW Smoky Topaz Rhodium Plated Silver / Sterling Silver Ring
DESIGNER'S NOTES This smoky topaz gemstone ring is modern elegance. Set in rhodium plated sterling silver and accented with cz's is the perfect touch to finalizing any outfit. Product Type Ring material rhodium plated sterling silver color silver...Only $72.00 at www.gemroc.com
no photo8.88 CTW Smoky Topaz Rhodium Plated Silver / Sterling Silver Ring
$72.00
www.gemroc.com
Women's Blue Topaz Prism Ring - Lagos
Bright blue topaz and sterling silver-with the signature Lagos Caviar beading, of course-give this ring statement status. Emerald-cut blue topaz center measures 12 x 10mm. Solid sterling silver settings and band. 18-karat yellow gold signature Lagos...Only $695.00 at Neiman Marcus
no photoWomen's Blue Topaz Prism Ring - Lagos
$695.00
Neiman Marcus
10 CTW Amethyst, Blue Topaz and White Topaz Ring in Sterling Silver, Size 6,8, Size 6,8
Rated by 25,000+ Customers. 10 CTW Amethyst, Blue Topaz and White Topaz Ring in Sterling SilverOnly $194.74 at PalmBeachJewelry
no photo10 CTW Amethyst, Blue Topaz and White Topaz Ring in Sterling Silver, Size 6,8, Size 6,8
$194.74
PalmBeachJewelry
Blue Topaz Caviar Ring, 4mm - Lagos
Sterling silver. Signature Lagos Caviar band. Cushion-cut blue topaz center. 0.39 total carat weight. 4mm wide.Only $195.00 at Neiman Marcus
no photoBlue Topaz Caviar Ring, 4mm - Lagos
$195.00
Neiman Marcus
Topaz And Garnet Personalized Romantic Ring: Two Hearts Become Soul Mates Jewelry
Personalized Jewelry - When two hearts become one, the power of love is forever binding. Now you can celebrate finding true love with your soul mate whenever you wear this topaz and garnet personalized romantic ring, a fine jewelry design available...Only $129.00 at The Bradford Exchange Online
no photoTopaz And Garnet Personalized Romantic Ring: Two Hearts Become Soul Mates Jewelry
$129.00
The Bradford Exchange Online
Midnight Marquise Quartz Pendant Necklace with Topaz & Diamonds - Alexis Bittar Fine
Light oxidized sterling silver cable chain necklace, by Alexis Bittar. Ocean blue quartz pendant set with claw prongs and detailed with London blue topaz, white diamonds, gray diamonds, and brown diamonds. Necklace, 16inL with 2in extender. Pendant, 1...Only $895.00 at Neiman Marcus
no photoMidnight Marquise Quartz Pendant Necklace with Topaz & Diamonds - Alexis Bittar Fine
$895.00
Neiman Marcus
5.55 CT TW Blue Topaz and London Blue Topaz Ring in Sterling Silver, Size 6,7,9, Size 6,7,9
Rated by 25,000+ Customers. 5.55 CT TW Blue Topaz and London Blue Topaz Ring in Sterling SilverOnly $132.99 at PalmBeachJewelry
no photo5.55 CT TW Blue Topaz and London Blue Topaz Ring in Sterling Silver, Size 6,7,9, Size 6,7,9
$132.99
PalmBeachJewelry
Stella Mini Lollipop Ring in Blue Topaz Doublet with Diamonds, 0.15 - Ippolita
From the Rock Candy Collection. Signature Ippolita hand-hammered sterling silver. Round-cut clear quartz and blue topaz doublet center. Pave diamond halo. H-I/SI-2 diamonds, 0.15 total carat weight. Face, 14mm (approx. 1/2in). US ring size 7. Imported.Only $650.00 at Neiman Marcus
no photoStella Mini Lollipop Ring in Blue Topaz Doublet with Diamonds, 0.15 - Ippolita
$650.00
Neiman Marcus
2.74 carat Oval-Cut Morganite and White Topaz Accent in Rose Gold over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
Rated by 25,000+ Customers. 2.74 TCW Oval-Cut Morganite and White Topaz Accent in Rose Gold over Sterling SilverOnly $218.49 at PalmBeachJewelry
no photo2.74 carat Oval-Cut Morganite and White Topaz Accent in Rose Gold over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
$218.49
PalmBeachJewelry
Seven-Station Lollipop Topaz Necklace - Ippolita
Perfect for filling scoop necklines and framing your face with light, this blue topaz and hammered sterling silver Ippolita necklace offers myriad looks a cool contemporary feel. Seven round-cut blue topaz stations. Sterling silver cable chain,...Only $695.00 at Neiman Marcus
no photoSeven-Station Lollipop Topaz Necklace - Ippolita
$695.00
Neiman Marcus
Swiss Blue Topaz Heart Promise Ring with Diamonds 1/10 Carat (ctw) in Sterling Silver
Swiss Blue Topaz Heart Promise Ring with Diamonds 1/10 Carat (ctw) in Sterling Silver #68JP75998BT. A classic heart promise ring featuring a blue topaz gemstone at its center is crafted from sleek sterling silver and imbued with 14 sparkling round...Only $99.00 at MyJewelryBox.com
no photoSwiss Blue Topaz Heart Promise Ring with Diamonds 1/10 Carat (ctw) in Sterling Silver
$99.00
MyJewelryBox.com
4.70 carat Oval-Cut Green Amethyst and White Topaz Accented Ring in 14k Gold over Sterling Silver, Size 6,7,8, Size 6,7,8
Rated by 25,000+ Customers. 4.70 TCW Oval-Cut Green Amethyst and White Topaz Accented Ring in 14k Gold over Sterling SilverOnly $85.49 at PalmBeachJewelry
no photo4.70 carat Oval-Cut Green Amethyst and White Topaz Accented Ring in 14k Gold over Sterling Silver, Size 6,7,8, Size 6,7,8
$85.49
PalmBeachJewelry
14k Yellow Gold Diamond, White Topaz Leverback Earrings Jewelry
This Earrings was handmade by a master artisan and is one of a kind.Only $959.99 at JeGem.com
no photo14k Yellow Gold Diamond, White Topaz Leverback Earrings Jewelry
$959.99
JeGem.com
3.50 carat Oval-Cut Fire Topaz and Diamond Accented Ring in 10k Gold, Size 10,6,7,8,9, Size 10,6,7,8,9
Rated by 25,000+ Customers. 3.50 TCW Oval-Cut Fire Topaz and Diamond Accented Ring in 10k GoldOnly $161.49 at PalmBeachJewelry
no photo3.50 carat Oval-Cut Fire Topaz and Diamond Accented Ring in 10k Gold, Size 10,6,7,8,9, Size 10,6,7,8,9
$161.49
PalmBeachJewelry
5.60 CT Yellow Topaz Filigree Ring in Tutone 14k Gold over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
Rated by 25,000+ Customers. 5.60 CT Yellow Topaz Filigree Ring in Tutone 14k Gold over Sterling SilverOnly $94.99 at PalmBeachJewelry
no photo5.60 CT Yellow Topaz Filigree Ring in Tutone 14k Gold over Sterling Silver, Size 6,7,8,9, Size 6,7,8,9
$94.99
PalmBeachJewelry