Pele's Hair Identification Guide

What Pele's Hair Looks Like

Pele's hair is volcanic glass spun into fine threads when gas-rich, fluid basaltic lava is torn apart by wind during fire-fountaining or lava-fall splashing. The fibers are golden-brown to greenish or olive, glassy, and extremely thin (often <0.5 mm), forming tangled, hairlike mats. It is the same composition as basaltic glass (a quenched silicate melt) but drawn into delicate strands. It is brittle and sharp, and the fibers glint with a vitreous luster.

Quick visual cues

• Fine, hairlike golden-brown to greenish glass fibers
• Glassy luster, often in tangled wind-blown clumps
• Extremely thin and brittle; snaps rather than bends far
• Frequently associated with small glass droplets (Pele's tears)

Step-by-Step Field ID Checklist

1. Observe the form: ultra-fine glassy threads, not mineral crystals or organic hair.
2. Check color and luster: golden-brown, olive, or green glass with a bright sheen.
3. Test brittleness (carefully): the fibers are glass — they fracture and can pierce skin, so handle with care.
4. Look for attached droplets: tiny teardrop glass beads (Pele's tears) often terminate the strands.
5. Context: found downwind of active basaltic vents and fountains.
6. Non-magnetic, non-crystalline: it is amorphous glass, not a fibrous mineral.

Key Diagnostic Tests

• Composition: basaltic (mafic) volcanic glass — a quenched silicate melt.
• Mohs hardness: ~5-6 (glass), but fibers are too thin for normal scratch testing.
• Luster: vitreous.
• Density: ~2.7-3.0 for basaltic glass, but as fibers it behaves as a light, airy mat.
• Brittleness: snaps cleanly; not flexible like organic or asbestos fibers.
• No acid reaction.

Common Look-Alikes and How to Tell Them Apart

• Pele's tears: the droplet form of the same glass — small black/brown teardrop beads rather than threads (often found together).
• Asbestos / fibrous minerals (e.g., chrysotile, amphibole): these are flexible crystalline fibers with mineral cleavage; Pele's hair is brittle amorphous glass.
• Basalt glass fragments (sideromelane): blocky shards rather than threads.
• Spun mineral wool / fiberglass (man-made): uniform machine-made fibers; Pele's hair is irregular and found in natural volcanic settings.
• Plant fibers / actual hair: organic, flexible, and burn rather than shatter; Pele's hair is rigid glass.

The defining combination is fine brittle glass threads of basaltic composition found near active volcanic vents, distinct from flexible mineral or organic fibers.

Where Pele's Hair Is Found

Pele's hair forms at basaltic volcanoes with vigorous fire-fountaining and lava lakes — most famously Kilauea in Hawaii (the strands are named for Pele, the Hawaiian volcano goddess), as well as Iceland, Nicaragua (Masaya), Ethiopia (Erta Ale), and Réunion. It collects downwind of vents, in vegetation, and in crevices.