Raspberry Tourmaline Identification Guide

What Raspberry Tourmaline Looks Like

"Raspberry tourmaline" is a pinkish-red rubellite (elbaite) variety, colored by manganese. It is a trigonal boron silicate and a member of the tourmaline group.

• Color: raspberry pink to red, sometimes with a slight purple cast; should hold its red under both daylight and incandescent light to be true rubellite
• Luster: vitreous
• Transparency: transparent to translucent
• Habit: elongated prisms with a rounded triangular cross-section and strong lengthwise striations

Step-by-Step Field ID Checklist

1. Check crystal habit — rounded triangular prism with striations parallel to the long axis.
2. Observe strong pleochroism — the stone shows two distinct pinks/reds depending on viewing direction.
3. Look for natural inclusions — thread-like cavities and "trichites" are common in rubellite.
4. Test hardness against quartz.
5. Examine fracture — conchoidal, with no obvious cleavage.

Key Diagnostic Tests

• Mohs hardness: 7–7.5 — scratches quartz.
• Cleavage: indistinct; conchoidal fracture.
• Streak: white.
• Specific gravity: ~3.0–3.1.
• Pleochroism: strong — a key separator from garnet.
• Optical: doubly refractive.

Common Look-Alikes and How to Tell Them Apart

• Raspberry/rhodolite garnet: singly refractive (no pleochroism), heavier (SG ~3.8), equant crystals, and often magnet-responsive. Tourmaline is strongly pleochroic and lighter.
• Pink/red beryl: harder (7.5–8), hexagonal prism, weak pleochroism, lighter (SG ~2.7).
• Ruby: much harder (9), heavier (SG ~4), strong red fluorescence.
• Pink topaz: distinct cleavage and higher SG (~3.5); topaz feels heavier and cleaves flat.
• Glass imitation: gas bubbles, no pleochroism, no striations.

Where It Is Found

Rubellite/raspberry tourmaline comes from granite pegmatites in Brazil, Madagascar, Mozambique, Nigeria, Afghanistan/Pakistan, and California/Maine (USA).

Collector's Notes and Common Mistakes

The defining separation from look-alike red gems is pleochroism plus crystal habit: rubellite shows two distinct reds as you rotate it and forms striated, rounded-triangular prisms, whereas garnet is single-color and equant, and beryl is hexagonal. By weight, tourmaline (SG ~3.0) sits between light beryl and heavy garnet. Be aware that "rubellite" is properly reserved for stones that stay red (not pink or brownish) under both daylight and incandescent light; many sellers stretch the term. A large share of pink-red tourmaline is irradiated to deepen color — generally stable, but disclosable. Rubellite is famously included (threadlike cavities, healed fractures), so eye-clean material commands a premium and very clean "rubellite" should raise suspicion of glass. With no significant cleavage and hardness 7–7.5 it wears well, though included stones can be fragile. Prospect zoned granite pegmatites, often alongside lepidolite and pink beryl.