PARAIBA type (Tourmaline)
Paraíba-Type Tourmaline: Neon Color, Copper & Identification
Paraíba-type tourmaline is prized for vivid blue, greenish-blue, and turquoise colors associated with copper, often alongside manganese. The name originated with deposits in Brazil and is also used for qualifying material from other localities under gem-trade conventions. Origin and treatment should be documented carefully.
Table of Contents
Formation and Geological Setting
The original Paraíba deposits in Brazil made copper-bearing tourmaline famous. Similar material has since been found in other countries, including parts of Africa. Geological origin cannot be determined from color alone, and trade definitions can depend on laboratory findings and market rules.
Properties and Appearance
Tourmaline is a complex borosilicate group with Mohs hardness around 7–7.5. Paraíba-type stones are known for saturated neon-like colors, but intensity varies. Inclusions, clarity, cut, carat weight, and treatment affect appearance and value.
Identification and Collecting
Gem laboratories can assess tourmaline identity, copper content, detectable treatments, and sometimes geographic origin. Ask for a reputable report when a stone is sold with a premium origin or variety claim. A bright blue-green color alone does not prove it is Paraíba-type material.
Care and Handling
Clean tourmaline with mild soap, lukewarm water, and a soft brush when suitable. Avoid sudden temperature changes and consult a gem professional before ultrasonic cleaning if the stone has fractures or unknown treatments.
Frequently Asked Questions
Can appearance alone confirm identity?
No. Similar materials and treatments can look alike. Use credible documentation and appropriate gemological testing when certainty matters.
What should collectors keep?
Retain locality details, seller disclosures, treatment information, and any laboratory reports with the specimen.
Further Reading & Sources
- Mindat — mineral data and localities.
- Handbook of Mineralogy — technical descriptions.
- Gemological Institute of America — gem identification and education.
- Wikipedia: Tourmaline — background and references.