Home » Minerals » Spodumene
An important source of high-purity lithium and a gemstone with collector appeal
Spodumene: Translucent to transparent spodumene with an attractive pink, yellow, or green color is sometimes faceted, cut en cabochon or used to make tumbled stones. Its perfect cleavage limits its use to jewelry that will not be subject to rough wear or handling. Spodumene is primarily a "collector's gemstone." The larger pieces of spodumene in this image are about one inch long.
What is Spodumene?
Spodumene is a pyroxene mineral that is found, almost exclusively, in granite pegmatites. It has a chemical composition of
LiAlSi2O6 but small amounts of sodium sometimes substitute for lithium.
Spodumene is typically found in lithium-rich pegmatites in association with other lithium minerals such as lepidolite, eucryptite, and petalite.
In the historical literature, the mineral is often referred to as "triphane."
Physical Properties of Spodumene
||White, gray, yellow, green, blue, lilac, pink, brown. Sometimes pleochroic
||Transparent to translucent
||Perfect in two directions with parting
||6.5 to 7
||3.1 to 3.3
||Prismatic crystals with strong striations parallel to their principal axis. Perfect cleavage.
||Monoclinic (low temperature), tetragonal (high temperature)
||An ore of lithium. Gemstones (kunzite, hiddenite)
Spodumene often occurs in extremely large crystals. One of the earliest accounts of large spodumene crystals is from the
Etta Mines, Black Hills, Pennington County, South Dakota. The United States Geological Survey, Bulletin 610 reports:
"The crystals are often of enormous size. In the Etta Mine, where they are best exposed both in the open cut and tunnel, they
frequently attain a diameter of 3 to 4 feet and a length of 30 feet. The largest "log" so far found was 42 feet long and
5 feet 4 inches in maximum diameter. This one log alone would yield 90 tons of spodumene." 
Giant spodumene crystals: Molds of giant spodumene crystals at the Etta Mines, Black Hills, Pennington County, South Dakota. Note miner at right center for scale. USGS photo. 
Uses of Spodumene
Spodumene once served as the most important ore of lithium metal. Although it remains an important source of lithium, today most of the world's
lithium is produced from subsurface brines in Chile, Argentina, and China. These sources of lithium have lower production costs and are suitable
for most uses. However, when lithium of highest purity is needed, spodumene is the source that is used.
Kunzite spodumene: Pink gem-quality spodumene (kunzite) from the Konar Valley, Afghanistan. Creative Commons image by Didier Descouens.
Spodumene: An ore-grade spodumene crystal section showing cleavage and typical striations. Photograph by Andrew Silver, USGS, BYU Collection.
Lithium battery: One of the primary uses of spodumene is in the production of high-purity lithium for use in lithium-ion batteries. The popularity of small electronic devices such as cell phones, portable computers, and cameras is driving the demand for spodumene. Photo copyright iStockphoto / Anton Snarikov.
Spodumene as a Gemstone
Spodumene sometimes occurs in transparent crystals in pastel shades of pink, green, and yellow. These
have been cut into gemstones that are prized by collectors. However, their use in jewelry is limited
to pieces that will be subject to limited abuse because of spodumene's perfect cleavage.
Pink to lilac specimens of gem-quality spodumene are highly prized and known as "kunzite".
The color of these specimens is attributed to the presence of manganese as a chromophore. Kunzite is
the most commonly encountered spodumene gem.
Many specimens of kunzite are strongly pleochroic, with the deepest color observed when the gem is
viewed down the principal axis. To take full advantage of its phenomenon, gemstones are cut with
the table perpendicular to the principal axis to yield stones of the deepest color.
Some kunzite will develop a richer color when heated or irradiated. These procedures have been
applied to some stones that enter the marketplace. Some specimens of kunzite will fade over time when
exposed to direct sunlight. Valuable stones should be stored away from direct light and, to be conservative, in a closed container.
Emerald-green spodumene is known as "Hiddenite." Its vivid green color is very similar to emerald
and is attributed to the presence of chromium as a chromophore. It is the rarest gem variety of spodumene.
It was first found near the town of Stony Point, North Carolina, which changed its name to "Hiddenite" after
the popular gemstone that attracted people to the area.
Yellow and clear specimens of spodumene have also been cut into gems; however, variety names for spodumene
gems have only been given to Kunzite and Hiddenite.
Uses of Lithium: Lithium has many diverse uses. This chart shows estimated global uses of lithium by end product.
It is mainly used in manufacturing rechargeable batteries, ceramics, specialty glass, high-temperature grease,
casting flux, polymers, aluminum alloys, and pharmaceuticals. USGS data from 2016. 
|Did You Know?
Lithium is an active ingredient in some medications. Salts of lithium are used in medication for bipolar disorder. The lithium contributes to a "mood-stabilizing" effect. One product has been named "Lithium." Image copyright iStockphoto / Paige Foster.
Demand for Spodumene
The demand for spodumene is dependent upon the use of lithium in manufacturing. In the past, most lithium
compounds and minerals were used to produce ceramics, glass, aluminum alloys, and high-temperature grease.
However, an exploding demand for rechargeable batteries to power cell phones, tablet computers, cameras, music players, GPS units, and other portable
electronic devices is driving the demand for high-purity lithium - and that drives the demand for spodumene.
Lithium batteries have a much higher charge-to-weight ratio and power-to-weight ratio than lead/acid and zinc carbon cells.
This makes lithium the battery material of choice.
Lithium produced from spodumene has fewer contaminants than lithium produced from brines. These contaminants can interfere with battery performance and make spodumene the preferred choice for battery lithium. A new battery technology could displace the use of lithium; however, most new battery technologies have been lithium-based.
 Mineralogic Notes, Series 3: Waldemar Schaller, Gigantic Crystals of Spodumene, United States Geological Survey, Bulletin 610, 1916.|
 Lithium: Brian W. Jaskula, United States Geological
Survey, Mineral Commodity Summaries, January 2017.
 Lithium: Brian W. Jaskula, United States Geological Survey,
Minerals Yearbook, November 2017.
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