Pietersite

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Pietersite is a striking variety of chalcedony that comes primarily from Namibia and, more recently, China. It commonly exhibits various shades of color, ranging from blue to gray and red to yellow and brown. Pietersite displays chatoyancy similar to tigers eye quartz.

Pietersite Polished
Pietersite Classification
Common Name Pietersite
Species Quartz
Pietersite Optical Properties
Transparency Semitranslucent - Opaque
Dispersion Strength: None
Refractive Index 1.544-1.553
Tolerance:very constant
Birefringence 0.004
Optic Character Uniaxial
Optic Sign Positive
Polariscope Reaction Aggregate (AGG)
Fluorescence SWUV: Inert
LWUV: Inert
Pleochroism None
Pietersite Characteristic Physical Properties
Hardness 7-6.5
Specific Gravity 2.640-2.690 Typical:2.660
Toughness Good
Inclusions Pietersite's broken up undulating chatoyant fibrous structure was caused by geologic stresses.
Luster Vitreous
Stability Good
Fracture Splintery
Cleavage None
Pietersite Chemistry & Crystallography
Chemical Name silicon dioxide (aka silica)
Chemical Formula SiO2
Crystal System Trigonal
Chemistry Classification Silicate

Pietersite Colors

  • Yellow Pietersite Yellow
  • Red Pietersite Red
  • Multi-color Pietersite Multi-color
  • Gray Pietersite Gray
  • Blue Pietersite Blue
  • Brown Pietersite Brown

Countries of Origin

China; Namibia; South Africa; Madagascar

Care

Normal care

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Tim Matthews

Author

Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.