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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
Sterling Silver Ring with Blue Topaz - Daisy Ring
This nature-inspired ring is the perfect everyday choice with a pretty petite gem-set bloom on a delicate modern band. Wear more than one to create a bouquet for your finger.Only $185.00 at Gemvara
no photoSterling Silver Ring with Blue Topaz - Daisy Ring
$185.00
Gemvara
Round London Blue Topaz Sterling Silver Ring with London Blue Topaz - Split Bamboo Three-Stone Ring
The open band of this stylish ring cradles three brilliant bezel-set gems.Only $180.00 at Gemvara
no photoRound London Blue Topaz Sterling Silver Ring with London Blue Topaz - Split Bamboo Three-Stone Ring
$180.00
Gemvara
Ruby and White Topaz Ring in Platinum over Sterling Silver
. A sumptuous display of faceted princess-cut rubies, .42 carat T.W., and round white topaz accents creates a ring of exceptional beauty. You'll want to wear it day and night. Platinum over sterling silver. Sizes 6-9. (Carat weights may vary by plus or...Only $66.49 at PalmBeachJewelry
no photoRuby and White Topaz Ring in Platinum over Sterling Silver
$66.49
PalmBeachJewelry
Round Red Garnet Sterling Silver Vintage-Inspired Ring with Blue Topaz & Black Onyx - 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 $200.00 at Gemvara
no photoRound Red Garnet Sterling Silver Vintage-Inspired Ring with Blue Topaz & Black Onyx - Venus Band
$200.00
Gemvara
Round Smoky Quartz Sterling Silver Mother's Ring with Amethyst & Blue Topaz - Liana Ring with Three Gems
This lovely leafy vine ring twines across the finger while brilliant gems bloom among the leaves.Only $185.00 at Gemvara
no photoRound Smoky Quartz Sterling Silver Mother's Ring with Amethyst & Blue Topaz - Liana Ring with Three Gems
$185.00
Gemvara
Sterling Silver Promise Ring with London Blue Topaz & Red Garnet - Double Knots Ring
This gorgeous, contemporary setting forms a pair of knots, each enclosing a stunning, 3mm, prong-set stone. It's carefully handcrafted in your choice of gems and metals.Only $165.00 at Gemvara
no photoSterling Silver Promise Ring with London Blue Topaz & Red Garnet - Double Knots Ring
$165.00
Gemvara
Blue Jade, .20ct t.w. Blue Topaz Cluster Drop Earrings in Gold
These jazzy blue jade and .20 ct. t.w. blue topaz cluster drop earrings are a blues festival of multiple shapes, accented with diamonds. Post/clutch, 14kt white gold earrings with a gunmetal finish.Only $895.00 at Ross-Simons
no photoBlue Jade, .20ct t.w. Blue Topaz Cluster Drop Earrings in Gold
$895.00
Ross-Simons
Round Aquamarine Sterling Silver Vintage-Inspired Ring with London Blue Topaz & Tanzanite - 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 Aquamarine Sterling Silver Vintage-Inspired Ring with London Blue Topaz & Tanzanite - Venus Band
$205.00
Gemvara
Round London Blue Topaz Sterling Silver Engagement Ring with Emerald - Brilliant Alhambra Solitaire
The poetry of the carved walls of the legendary Alhambra Palace inspired the intricately endless Celtic knot motifs of this ring. Four gems link together leading up to the grand finale gem. The lovely loops of the design go all the way around.Only $770.00 at Gemvara
no photoRound London Blue Topaz Sterling Silver Engagement Ring with Emerald - Brilliant Alhambra Solitaire
$770.00
Gemvara
Round Aquamarine Sterling Silver Vintage-Inspired Ring with London Blue Topaz & Black Onyx - 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 $200.00 at Gemvara
no photoRound Aquamarine Sterling Silver Vintage-Inspired Ring with London Blue Topaz & Black Onyx - Venus Band
$200.00
Gemvara
Round Yellow Sapphire Sterling Silver Vintage-Inspired Ring with Blue Topaz & 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 $205.00 at Gemvara
no photoRound Yellow Sapphire Sterling Silver Vintage-Inspired Ring with Blue Topaz & Citrine - Venus Band
$205.00
Gemvara
Round White Sapphire Sterling Silver Promise Ring with London Blue Topaz & Amethyst - Modern Heart Ring
This stylishly-simple heart ring is carefully handcrafted in your choice of gems and metals.Only $200.00 at Gemvara
no photoRound White Sapphire Sterling Silver Promise Ring with London Blue Topaz & Amethyst - Modern Heart Ring
$200.00
Gemvara
Round Iolite Sterling Silver Mother's Ring with Aquamarine & London Blue Topaz - Liana Ring with Three Gems
This lovely leafy vine ring twines across the finger while brilliant gems bloom among the leaves.Only $185.00 at Gemvara
no photoRound Iolite Sterling Silver Mother's Ring with Aquamarine & London Blue Topaz - Liana Ring with Three Gems
$185.00
Gemvara
Arctic Ring with White Topaz - Elizabeth and James - White topaz (8)
Elizabeth and JamesArctic Ring with White TopazDetailsArctic three-finger ring by Elizabeth and James.25% silver alloy, 1 micron of 24-karat yellow gold.Pave white topaz.Imported.Designer About Elizabeth and James:Elizabeth and James brings a designer...Only $125.00 at Neiman Marcus
no photoArctic Ring with White Topaz - Elizabeth and James - White topaz (8)
$125.00
Neiman Marcus
18.00 ct. t.w. White Topaz Tennis Necklace in Sterling Silver
An RS exclusive. The brilliance of a particularly bright gem is showcased in this 18.00 ct. t.w. white topaz tennis necklace. You'll find yourself reaching for this dazzler time and time again! Box clasp. Sterling silver necklace.Only $221.25 at Ross-Simons
no photo18.00 ct. t.w. White Topaz Tennis Necklace in Sterling Silver
$221.25
Ross-Simons
 

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