THE MINERAL TOPAZ

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  • 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 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 Ring with London Blue Topaz & Red Garnet - Double Knots Ring
$165.00
Gemvara
3.10ct t.w. Pink Topaz, .10ct t.w. Diamond Necklace in Silver
Bright and sparkling, 3.10 ct. t.w. pink topaz and .10 ct. t.w. diamond twists adorn the front of this chevron-style necklace. Suspends from a cable chain with a lobster clasp. Sterling silver necklace.Only $105.00 at Ross-Simons
no photo3.10ct t.w. Pink Topaz, .10ct t.w. Diamond Necklace in Silver
$105.00
Ross-Simons
3.50 TCW Oval-Cut Fire Topaz and Diamond Accented Ring in 10k Gold
. A fabulous oval-cut 3.50 carat mystic topaz stone radiates intense beauty atop a ring made even more dazzling with shimmering diamond accents. A stunning offering created in 10k gold. Sizes 6-10. (All carat weights are approximate and may vary...Only $161.49 at PalmBeachJewelry
no photo3.50 TCW Oval-Cut Fire Topaz and Diamond Accented Ring in 10k Gold
$161.49
PalmBeachJewelry
Sterling Silver Ring with Diamond & Blue Topaz - Remember Forever Ring
Two gems wrapped in a knot to remember this moment forever.Only $190.00 at Gemvara
no photoSterling Silver Ring with Diamond & Blue Topaz - Remember Forever Ring
$190.00
Gemvara
10 CTW Amethyst, Blue Topaz and White Topaz Ring in Sterling Silver
. Amethyst and blue and white topaz ring revealing 9.99 carats T.W. of gemstonesin a lovely flower design. Pure fashion magic. Sterlingsilver. Sizes 6-9. (Carat weight may vary by plus of minus 5% of thestated carat weight.)Only $194.74 at PalmBeachJewelry
no photo10 CTW Amethyst, Blue Topaz and White Topaz Ring in Sterling Silver
$194.74
PalmBeachJewelry
Round Blue Topaz Sterling Silver Ring - Snake Ring
This curvy ring with one bezel-set gem twines gracefully around your finger.Only $180.00 at Gemvara
no photoRound Blue Topaz Sterling Silver Ring - Snake Ring
$180.00
Gemvara
Sterling Silver Ring with Amethyst & Blue Topaz - Chloe Band
Blazing with brilliance, this spectacular style has princess cut gems dancing with brilliance everywhere you look. Lovely on its own, this band also perfectly complements the Chloe Ring.Only $480.00 at Gemvara
no photoSterling Silver Ring with Amethyst & Blue Topaz - Chloe Band
$480.00
Gemvara
6.41 TCW Cushion-Emerald-Cut Blue Genuine Topaz Diamond Accent Platinum over Sterling Silver Ring
. A lush cushion-cut blue topaz, 6.40 carats, iced with glittering diamond accents creates a captivating ring designed to impress. A sophisticated alliance of chic color and style. Created in platinum over sterling silver. Sizes 6-10. (All carat...Only $96.89 at PalmBeachJewelry
no photo6.41 TCW Cushion-Emerald-Cut Blue Genuine Topaz Diamond Accent Platinum over Sterling Silver Ring
$96.89
PalmBeachJewelry
2.50-Carat Oval-Cut Genuine Blue Topaz and Diamond Accent Platinum over Sterling Silver Ring
. Shimmering with ethereal elegance, this oval-cut blue topaz ring, 2.50 carats, is design sophistication at its most splendid detailed with glimmering diamond accents. Created in platinum over sterling silver. Sizes 6-10. (All carat weights are...Only $75.96 at PalmBeachJewelry
no photo2.50-Carat Oval-Cut Genuine Blue Topaz and Diamond Accent Platinum over Sterling Silver Ring
$75.96
PalmBeachJewelry
12.10 Cushion-Cut Green Amethyst and White Topaz Accented Ring in Platinum over Sterling Silver
. Opulence shines from every angle of this ring lavished with a cushion-cut green amethyst in the center encircled with sparkling round white topaz accents. A stunning selection offering 12.10 carats T.W. of gemstones. Platinum over sterling silver....Only $123.49 at PalmBeachJewelry
no photo12.10 Cushion-Cut Green Amethyst and White Topaz Accented Ring in Platinum over Sterling Silver
$123.49
PalmBeachJewelry
Round Black Onyx Sterling Silver Ring with London 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 $200.00 at Gemvara
no photoRound Black Onyx Sterling Silver Ring with London Blue Topaz & Citrine - Venus Band
$200.00
Gemvara
Blue Topaz and Amethyst Double Heart Ring with Diamonds 4/5 Carat (ctw) in 10K White Gold
Blue Topaz and Amethyst Double Heart Ring with Diamonds 4/5 Carat (ctw) in 10K White Gold #08CH50319MGW. Elegant and endearing, this 10 karat white gold ring features heart-shaped gems of blue topaz and amethyst. The look is completed by delicately...Only $179.00 at MyJewelryBox.com
no photoBlue Topaz and Amethyst Double Heart Ring with Diamonds 4/5 Carat (ctw) in 10K White Gold
$179.00
MyJewelryBox.com
.56 TCW White Topaz and Jade Ring in 10k Gold
. A ring of pure drama created in green Jade, with a centerpiece of sparkling .50 carat white topaz anchored in glistening 10k gold. This ring is a modern expression of elegance for today's trendsetter. Sizes 5-10.Only $64.59 at PalmBeachJewelry
no photo.56 TCW White Topaz and Jade Ring in 10k Gold
$64.59
PalmBeachJewelry
4.70 TCW Oval-Cut Green Amethyst and White Topaz Accented Ring in 14k Gold over Sterling Silver
. Expect the unexpected with this gorgeous green amethyst. This oval-cut beauty is accented with white topaz. The result is 4.70 carats T.W. of elegance. Set in 14k gold over sterling silver. Sizes 6-9.Only $85.49 at PalmBeachJewelry
no photo4.70 TCW Oval-Cut Green Amethyst and White Topaz Accented Ring in 14k Gold over Sterling Silver
$85.49
PalmBeachJewelry
7.75 ct. t.w. London Blue Topaz Bracelet in Sterling Silver. 7"
As beautiful as blue can be. 7.75 ct. t.w. London blue topaz line this classic design. Sterling silver bracelet. Blue Topaz birthstones are the perfect gift for December birthdays.Only $221.25 at Ross-Simons
no photo7.75 ct. t.w. London Blue Topaz Bracelet in Sterling Silver. 7"
$221.25
Ross-Simons
 

This Site Awarded
Available TOPAZ specimens:
TOPAZ specimen TOP-57
$ 115.00 -20% = $ 92.00
Dims: 2.51x2.45x1.57in (6.39x6.21x4.00cm) .... Wt: 10.7oz (304g) .... Loc: Katlang Mine, N.F.W.P, Pakistan
There are two significant topaz crystals here along with several minor ones. They have good form, luster, and transparency, although neither shows terminations. The smaller is also darker, with excellent color.
no photo
TOP-57
$ 92.00
no photo
TOPAZ specimen TOP-63
$ 36.00 -20% = $ 28.80
Dims: 2.99x2.54x1.47in (7.60x6.45x3.75cm) .... Wt: 5.9oz (168g) .... Loc: Thomas Range, Utah, USA
This complex specimen appears to me to be a chunk of calcite most of which has been disolved away with acid, exposing (in places) a fine druze of quartz crystals, some black crystals that look like hematite, and at least twenty golden topaz crystals, most of which are quite small. The largest is, unfortunately, coated with a quartz druse, but the second largest is free of such coatings and presents nicely.
no photo
TOP-63
$ 28.80
no photo
see this List of ALL specimens including SOLD ones
 

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