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Turquoise

Turquoise

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: August 2022
Turquoise Polished Turquoise Rough Turquoise Jewelry
Table of Contents
  • General Information
  • Turquoise Colors
  • Turquoise Spectra
  • Alternate Names
  • Countries of Origin
  • History
  • Care
  • Creation Classification
  • Enhancement

Turquoise is one of the oldest known gem materials. Turquoise is a copper ore found in arid or semiarid regions. The earliest turquoise mines were in the Sinai. In the el-Qaa region archeologists have found turquoise in tombs that are believed to date to 5000 B.C.. Turquoise jewelry and objects for ornamentation have been found in Egyptian, Persian, Chinese and Aztec historic sites. Native Americans in the Southwest United States have a long history of using turquoise in jewelry. Turquoise mining in what is known as the United States dates back to 200 B.C.. Vast historic trade routes can be traced from the American Southwest into Mesoamerica. Turquoise can be blue or green depending on copper, iron, and zinc content.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Turquoise
Species
Turquoise
Transparency
Semitranslucent - Opaque
Dispersion
Strength: None
Refractive Index
1.610-1.650
Birefringence
0.04
Optic Character
Biaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG)
Fluorescence
SWUV: Inert
LWUV: Inert to weak greenish yellow
CCF Reaction
None
Pleochroism
None
Hardness
5-6
Streak
White
Specific Gravity
2.380-2.860 Typical:2.740
Toughness
Varies
Inclusions
Turquoise often has brown, gray or black matrix that is sometimes recessed below the polished surface of the stone. Stone may contain pyrite or calcite inclusions.
Luster
Vitreous, Waxy
Fracture
Granular, Conchoidal
Cleavage
None
Chemical Name
hydrated copper aluminum phosphate
Chemical Formula
CuAl6(PO4)4(OH)8-5H2O
Crystal System
Triclinic
Chemistry Classification
Phosphate

Turquoise Colors

  • Blue Turquoise
    Blue
  • Blue Turquoise
    Blue
  • Green Turquoise
    Green

Turquoise Spectra

Turquoise Spectra
TURQUOISE

Color due to copper. The diagnostic lines due to copper in the deep blue to violet region are difficult to detect and have eluded many observers. Light reflected off the sub-surface provides insufficient absorption. Transmitted light through a translucent edge, although, better is not always possible. This shallow cabochon did however transmit sufficient light at the edge to show an absorption band centered at 425nm. with just a hint of transmission in the middle to indicate two lines. (See BLC0973 below) The remainder of the spectrum transmits to about 530nm. before total absorption take over.

Turquoise Spectra
TURQUOISE

Color due to copper. The very small shallow cabochon used for this spectrum was thin enough to pass sufficient light by direct transmission. This photograph has been over exposed using a 150 watt fiber optic lamp so that the viewer can easily resolve the two lines at 420nm. and 432nm. As a result, the remainder of the spectrum transmits to about 560nm.

We acknowledge the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Alternate Names

Turuqois, Gilson Synthetic Turquoise, Gilson Turquoise

Countries of Origin

Tanzania, United Republic Of; Colombia; Iran (Islamic Republic of); Cambodia; Philippines; United States of America; Ukraine; Thailand; United Kingdom of Great Britain and Northern Ireland; India; Canada; Unknown; China; Brazil; Italy; Mexico; Israel; Chile

History

Stunning sky blues, striking sea greens and rich robin's egg shades make turquoise a very desirable gemstone. Turquoise is almost always cut en cabochon or as a bead. It is seldom faceted. The dark and sometimes coppery-colored veins are part of the beauty of turquoise and the smooth cabochon cut serves to showcase these distinctive features. Turquoise may be the first stone ever mined. There is some evidence that suggests it may have been mined as far back as 4000 B.C. It is a 5 - 6 on the scale of hardness, but its porosity presented real challenges in the past, as turquoise changed color with time and wear. Today's gemstone treatments help alleviate that problem. The name, "turquoise," is relatively new to this blue stone. Pliny the Elder referred to it as callais from the Greek meaning "beautiful stone." It's thought that the name turquoise came into use somewhere around the 13th century.

Care

Gentle care, natural turquoise is very soft and porous, so avoid contact with oils and colored fluids. Clean with clean damp cloth only. Avoid hot water, household chemicals, steam and ultrasonic cleaners for stabilized stones.

Creation Classification

Lab Created

Some gems, like turquoise, are highly coveted but rare to find, much less in the sizes and quality people dream of owning. Laboratory created jewels offer you the best of both worlds. You get the beauty of a beloved gemstone, but at a budget friendly price. The term synthetic refers to a man-made material with a natural counterpart. The synthetic material replicates the chemical, optical and physical properties of the natural version with little or no variation.

Lab Created Turquoise
Lab Created Turquoise
  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Lab Created
Refractive Index
1.61-1.65
Specific Gravity
2.38
Inclusions
Synthetic turquoise has tiny blue microspheres that give it a "cream-of-wheat" appearance. Stones might have blue thread like inclusions and artificial black matrix that is even with the surface.

Enhancement

Impregnated Turquoise

As it occurs naturally, turquoise is a soft mineral that is easily scratched. Its porous nature can allow the absorption of oils and fluids that can discolor it over time. To improve its durability and appearance, much of the turquoise on the market today is stabilized. One popular method of stabilization is impregnation, which fills the porous areas with a colorless agent, usually plastic.

Impregnated Turquoise Turquoise
Impregnated Turquoise Turquoise
  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Impregnated Turquoise
Refractive Index
1.6-1.61
Specific Gravity
2.5
Inclusions
Impregnated turquoise often has brown, gray or black matrix that is recessed below polished surface.Stones will have a higher luster than natural turquoise. Stones may contain pyrite or calcite inclusions. Stones can have a speckled appearance similar to the "cream-of-wheat" effect if wax impregnated.
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