Tangerine Tourmaline Identification Guide
Recognize vivid orange tangerine tourmaline by crystal habit, striations, and pleochroism, and separate it from spessartine and citrine.
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What Tangerine Tourmaline Looks Like
Tangerine tourmaline is an orange variety of elbaite tourmaline, colored by manganese and trace iron. It shows the species' signature elongate, ridged crystals and strong optical effects.
- Color: bright orange to orange-red and golden-orange; can be uneven or zoned.
- Luster: vitreous (glassy).
- Transparency: transparent to translucent in gem material.
- Crystal habit: long prismatic crystals with a rounded-triangular cross-section and prominent lengthwise striations parallel to the c-axis.
Step-by-Step Field ID Checklist
- Inspect the crystal shape. A long prism with a curved-triangular cross-section and vertical striations strongly suggests tourmaline.
- Rotate under light for pleochroism. Tourmaline often shows two visibly different tones (e.g., orange to lighter/darker orange) as you turn it.
- Hardness check. Tourmaline is Mohs 7-7.5—it scratches glass and resists a steel knife.
- Look for the absence of cleavage. Tourmaline has indistinct cleavage and breaks conchoidally; no flat cleavage planes.
- Streak. White.
- Density heft. Slightly denser than quartz; gives a modest extra heft.
Key Diagnostic Tests
- Hardness: 7-7.5.
- Streak: white/colorless.
- Cleavage/fracture: very poor cleavage; uneven to conchoidal fracture.
- Pleochroism: distinct—a key separator from singly refractive garnet.
- Density: ~3.0-3.1.
- Acid: inert.
Common Look-Alikes
- Spessartine/mandarin garnet: also vivid orange but is isometric (no pleochroism), forms dodecahedral/trapezohedral grains rather than striated prisms, and is denser (~4.1-4.2)—a heft test separates them.
- Citrine/orange quartz: softer feel only marginally (both ~7) but quartz lacks pleochroism and tourmaline's triangular striated prism; quartz crystals are hexagonal.
- Hessonite garnet: brownish-orange, isometric, no pleochroism, often with treacle-like internal swirls.
- Orange sapphire/padparadscha: much harder (9) and far denser (~4.0), with hexagonal habit.
Where It Is Found
Gem orange tourmaline comes mainly from granitic pegmatites. Notable sources include Nigeria, Mozambique, Tanzania, Madagascar, and Brazil, often alongside pink, yellow, and bicolor elbaite.
Frequently asked questions
How can you tell if it is real tangerine tourmaline?
Look for an elongate prismatic crystal with a rounded-triangular cross-section, lengthwise striations, distinct pleochroism, and Mohs 7-7.5 hardness. The combination of striated prism plus color change on rotation is characteristic of tourmaline.
What is the difference between tangerine tourmaline and spessartine garnet?
Tourmaline is pleochroic and forms striated prisms, while spessartine garnet is singly refractive (no pleochroism), forms rounded isometric crystals, and is much denser, so it feels noticeably heavier.
What does tangerine tourmaline look like?
Bright orange to orange-red transparent crystals, typically long prisms with vertical grooves, that shift tone slightly when rotated under light.
Where is tangerine tourmaline found?
It comes from granitic pegmatites, with major sources in Nigeria, Mozambique, Tanzania, Madagascar, and Brazil.