Teal Tourmaline Identification Guide
Identify blue-green teal tourmaline by habit, striations, and pleochroism, and separate it from indicolite, apatite, and tourmaline-colored simulants.
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What Teal Tourmaline Looks Like
Teal tourmaline is a blue-green variety of elbaite tourmaline, colored by iron (and sometimes copper in Paraiba-type material). It sits between blue (indicolite) and green tourmaline on the color spectrum.
- Color: blue-green to green-blue (teal); copper-bearing stones can be vivid neon teal.
- Luster: vitreous.
- Transparency: transparent to translucent.
- Crystal habit: elongate prisms with a rounded-triangular cross-section and strong lengthwise striations.
Step-by-Step Field ID Checklist
- Inspect crystal form. A striated prism with curved-triangular cross-section signals tourmaline.
- Check pleochroism. Rotate the stone—teal tourmaline shows two visibly different blue-green tones (often darker along the c-axis), distinguishing it from singly refractive simulants.
- Hardness. Mohs 7-7.5; scratches glass, resists a knife.
- Look for no cleavage. Tourmaline lacks good cleavage and fractures conchoidally.
- Streak. White.
- Heft. Density ~3.0-3.1; a slight extra weight versus quartz.
Key Diagnostic Tests
- Hardness: 7-7.5.
- Streak: white.
- Cleavage/fracture: poor cleavage; uneven to conchoidal fracture.
- Pleochroism: distinct—a key separator from apatite and glass.
- Density: ~3.0-3.1.
- Acid: inert.
Common Look-Alikes
- Indicolite (blue tourmaline): same species, just bluer; teal has a stronger green component.
- Apatite (teal/Paraiba-like): much softer (5)—easily scratched by quartz—and often has more even color; apatite is a common teal simulant but fails the hardness test.
- Blue-green sapphire: much harder (9) and denser (~4.0), hexagonal habit.
- Aquamarine: hexagonal beryl, weaker pleochroism, lighter, more sky-blue than teal.
- Glass/CZ simulants: no pleochroism, possible bubbles, and different RI/density.
- Paraiba tourmaline: a copper-bearing teal tourmaline—genuine neon ones command premium prices and may need lab confirmation of copper.
Where It Is Found
Teal elbaite comes from granitic pegmatites in Brazil, Nigeria, Mozambique, Afghanistan, and Madagascar. Copper-bearing (Paraiba-type) teal material is from Brazil, Nigeria, and Mozambique.
Frequently asked questions
How can you tell if teal tourmaline is real?
Real teal tourmaline shows an elongate striated prism with a rounded-triangular cross-section, distinct pleochroism, hardness 7-7.5, and no good cleavage. The striated habit plus two-tone color shift on rotation confirms tourmaline.
What is the difference between teal tourmaline and apatite?
Apatite is a common teal simulant but is much softer (Mohs 5) and is easily scratched, while tourmaline is 7-7.5 and resists scratching. Tourmaline also shows stronger pleochroism and striated crystals.
Teal tourmaline vs indicolite—what is the difference?
Both are blue varieties of elbaite tourmaline. Indicolite is more pure blue, while teal tourmaline has a noticeable green component, giving a blue-green color.
Is teal tourmaline the same as Paraiba?
Not always. Some teal tourmaline is colored by iron, while Paraiba-type teal is colored by copper and shows a neon glow. Genuine Paraiba is far rarer and usually needs laboratory confirmation of copper content.