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Tourmaline
Tourmalines have a variety of exciting colors with one of the widest color ranges of any gem.
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Research
Whimsical Growth Tubes in Tourmaline
Microscopic examination reveals intriguing growth tubes in a copper-bearing tourmaline.
Tourmaline in Tourmaline
A perfectly shaped euhedral tourmaline crystal is identified in a faceted tourmaline.
Gaseous Carbon Dioxide Phases in Paraíba Tourmaline
Immiscible two-phase fluid inclusions are investigated in a 0.48 ct Paraíba tourmaline.
Lepidolite in Copper-Bearing Tourmaline
Paraíba Tourmaline Melee: An Entry-Level Market Perspective
Mineral Assemblage of “Paraíba Matrix”
Micro-Features of Tourmaline
Provides a visual guide to the internal features of tourmaline as well as tourmaline inclusions in other gem hosts.
Brazilian Watermelon Tourmaline with Iris Effect
A pair of watermelon tourmaline slices from the Cruzeiro mine displays a rainbow of colors.
In Memoriam: Heitor Barbosa
Interesting Metallic Platelets in a Brazilian Paraíba Tourmaline
Microscopic observation unveils the first known instance of skeletal metallic inclusions in Brazilian Paraíba tourmaline.
New Tourmaline Pockets in San Diego County’s Pala District
Cat’s-Eye Paraíba Tourmaline with Copper Inclusions
The Tokyo laboratory examines a Paraíba tourmaline with chatoyancy caused by copper inclusions.
