Kunzite Identification Guide
Identify Kunzite, the pink-to-lilac gem spodumene, by its pleochroism, perfect cleavage, hardness, and pegmatite origin.
Read the full Kunzite encyclopedia entry →
What Kunzite Looks Like
Kunzite is the pink-to-lilac to violet gem variety of spodumene (a lithium aluminum silicate, LiAlSi2O6), colored by manganese. It is transparent with a vitreous luster and famous for strong pleochroism: the same crystal looks more intensely pink/violet down its length and paler (or colorless) across it. Crystals are prismatic with vertical striations and a flattened habit, often large, and show distinct flat cleavage faces. Color tends to be delicate and can fade with prolonged sunlight exposure.
Quick visual cues
- Soft pink to lilac/violet transparent crystals
- Strong color change with viewing direction (pleochroism)
- Striated, flattened prismatic crystals
- Two good cleavages meeting near 90 degrees, plus a parting
Step-by-Step Field ID Checklist
- Note the color: delicate pink-lilac is classic kunzite (deep green spodumene is hiddenite; yellow is triphane).
- Check pleochroism: rotate the stone—kunzite shows clearly different color intensities along different axes.
- Look for cleavage: two perfect prismatic cleavages (~87/93 degrees) are a major identifier and a cutting hazard.
- Test hardness: Mohs 6.5-7, scratches glass.
- Examine crystal form: striated, flattened prisms typical of pegmatite spodumene.
- Heft: moderate density (~3.1-3.2).
Key Diagnostic Tests
- Mohs hardness: 6.5-7.
- Cleavage: two perfect prismatic cleavages near 90 degrees, plus parting—diagnostic and makes it fragile.
- Pleochroism: strong (pink/violet vs near-colorless)—a key separator from look-alikes.
- Density: ~3.1-3.2 g/cm^3.
- Refractive index (lab): ~1.66-1.68.
- Streak: white; acid: no reaction.
- Fade test (be careful): kunzite's color can fade with strong UV/sunlight—evidence of Mn coloration.
Common Look-Alikes and How to Tell Them Apart
- Pink topaz: harder (Mohs 8), different cleavage (one basal), higher density; weaker pleochroism.
- Morganite (pink beryl): hexagonal, no easy cleavage, hardness 7.5-8, weaker pleochroism—and beryl doesn't show kunzite's near-90-degree prismatic cleavage.
- Pink/rubellite tourmaline: trigonal, no cleavage, very strong pleochroism but a rounded triangular cross-section; tourmaline lacks kunzite's flat cleavage planes.
- Rose quartz/pink sapphire: rose quartz is usually translucent and lacks cleavage; pink sapphire is far harder (9) and denser.
Where It Is Found
Kunzite forms in lithium-rich granitic pegmatites. Famous sources include California (Pala, San Diego County—where it was first described), Afghanistan and Pakistan, Brazil, and Madagascar, where it occurs with other pegmatite gems like tourmaline, beryl, and lepidolite.
Frequently asked questions
How can you tell if it's real Kunzite?
Real kunzite is transparent pink-to-lilac spodumene with strong pleochroism (color shifts with viewing angle), two perfect prismatic cleavages near 90 degrees, a hardness of 6.5-7, density about 3.1-3.2, and a pegmatite origin.
What is the difference between Kunzite and Morganite?
Both are pink gems, but kunzite is spodumene with strong pleochroism and two perfect cleavages near 90 degrees, while morganite is beryl—harder (7.5-8), with no easy cleavage and weaker pleochroism.
Does Kunzite fade in sunlight?
Yes, kunzite's manganese-caused pink-lilac color can fade with prolonged exposure to strong sunlight or UV, so it is best displayed and worn away from intense light.
Kunzite vs pink tourmaline—how do you tell them apart?
Pink tourmaline (rubellite) has no cleavage and a rounded triangular cross-section, while kunzite shows flat, perfect cleavage planes near 90 degrees; both are pleochroic, but the cleavage and crystal form are the giveaways.
Kunzite identified by the community
Recent Kunzite specimens identified with Rock Identifier.
