Spodumene
Spodumene
LiAlSi₂O₆ Properties
- Color
- Colorless, gray, pink-lilac (kunzite), green (hiddenite)
- Luster
- Vitreous
- Density
- 3.03–3.23 g/cm³
- Category
- Mineral
Spodumene is a lithium pyroxene — LiAlSi₂O₆ — and one of the primary industrial sources of lithium extracted from pegmatitic rocks. Its gem varieties are kunzite (pink-lilac, from manganese) and hiddenite (green, from chromium).
Spodumene forms almost exclusively in lithium-rich granitic pegmatites, often associated with lepidolite, elbaite, beryl, and columbite. Crystals can reach extraordinary dimensions: the largest single crystal on record, from South Dakota, exceeded 14 meters in length.
Industrially, spodumene sits at the heart of the global energy transition: it is the primary source of lithium for lithium-ion batteries in electric vehicles. The spodumene pegmatite deposits of Western Australia (Greenbushes, Pilgangoora) are among the most productive in the world.
Kunzite, with its intense pink-lilac color from manganese, was discovered in 1902 in California and named after gemologist George Frederick Kunz. Hiddenite, green from chromium, is rarer and comes almost exclusively from Alexander County, North Carolina.
Formula: LiAlSi₂O₆. Monoclinic system, space group C2/c. Perfect cleavage in two directions at 87° — a pyroxene-group characteristic that makes gem cutting challenging. Refractive index 1.648–1.679, birefringence 0.014–0.027. Strong pleochroism in kunzite (colorless / pale pink / intense pink). Kunzite often shows intense orange-pink fluorescence under long-wave UV. Polymorphous with β-spodumene, the high-temperature phase used in technical ceramics.
Mining localities
- Nuristan, Afghanistan
- Minas Gerais, Brazil
- North Carolina, USA
- Madagascar
- Pakistan
Frequently Asked Questions
Is spodumene really used in electric vehicle batteries?
Yes. Spodumene is one of the world's primary sources of lithium for lithium-ion batteries. Large-scale spodumene pegmatite deposits in Western Australia are mined industrially to meet lithium demand from electric vehicles and grid-scale energy storage.
What is the difference between kunzite and spodumene?
Kunzite is simply the pink-lilac color variety of spodumene: same mineral species, but with manganese traces producing the color. It is not a distinct species — a colored spodumene, much as pink corundum is still corundum.
Why is spodumene difficult to cut as a gemstone?
Because of its perfect cleavage in two directions intersecting at 87°: a hard blow in the wrong direction during cutting can split the crystal. Skilled lapidaries orient the cut to minimize risk, but kunzite remains a relatively fragile gem to wear.
Entry generated with Claude API (Anthropic) on data extracted from Mindat, RRUFF and Wikipedia. Not yet reviewed by a human expert. Verify data against original sources before citing in formal work.
