Hiddenite: the green spodumene variety, history, care and buying tips

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Hiddenite is the emerald-green variety of spodumene, coloured by chromium. Discovered in North Carolina around 1879, it is rare and cleaves easily.

Key points

Colour	pale green to emerald green, sometimes yellowish or bluish depending on the viewing angle (pleochroism)
Mineral family	lithium pyroxene: lithium aluminium silicate, LiAlSi2O6 (spodumene)
Hardness (Mohs)	about 6.5 to 7, with very distinct cleavage
Origin of the colour	traces of chromium
Discovery	around 1879, Alexander County, North Carolina (United States)
Origin of the name	William Earl Hidden, geologist; name proposed by the chemist J. Lawrence Smith
Known deposits	North Carolina, Afghanistan, Brazil, Madagascar
Precautions	fragile cleavage; the related kunzite fades in light, so take care

What is hiddenite?

Hiddenite is the green variety of spodumene, a lithium-rich pyroxene (LiAlSi2O6). Spodumene occurs in several colours: kunzite is lilac to pink (coloured by manganese), triphane is yellowish, and hiddenite is green, coloured by traces of chromium. It is the same mineral, its colour depending on its impurities.

Spodumene has been known since 1800 (first described at Utö, Sweden) and plays a major economic role: it is a lithium ore used in batteries, ceramics and glass. Hiddenite is its rare gem variety.

Its hardness, about 6.5 to 7, is sufficient for jewellery, but the mineral has a perfect prismatic cleavage: a well-placed knock can split it. This is its weak point, as with kunzite.

An American discovery

Around 1879, yellowish-green crystals were found near White Plains, west of Stony Point, in Alexander County (North Carolina). A local dealer showed them to William Earl Hidden, a geologist who was prospecting in the area (according to some accounts, on behalf of Thomas Edison, looking for platinum). At first they were taken for transparent diopside. The chemist J. Lawrence Smith, of Louisville (Kentucky), analysed them, recognised a variety of spodumene and proposed the name “hiddenite” in honour of Hidden. Local miners had previously called it “lithium emerald”.

Some commercial sources credit a different author and date for the name; here we follow the version most widely used in the mineralogical literature. The American deposits are now almost exhausted; most stones come from Afghanistan, Brazil or Madagascar.

Lithium, an everyday element

Spodumene is one of the main lithium ores, the light metal found in the rechargeable batteries of phones and electric cars. Around 2019, about half of the world’s lithium came from ores such as spodumene, and Australia became the leading producing country in 2020.

The gem variety, by comparison, represents a tiny quantity in that industry. It forms in particular veins of granite called pegmatites, where the remaining magma crystallises slowly and produces large crystals, often accompanied by quartz and feldspar. This is why hiddenite and kunzite are found in pegmatite regions: North Carolina, Afghanistan, Brazil, Madagascar.

Traditional symbolism

A green and rare stone, hiddenite is associated in modern crystal literature with the heart, calm and openness to others. It is presented as a stone of gentleness.

It was discovered late and therefore has no ancient tradition. These associations come from its colour and from the modern world of gemstones. No study has demonstrated any effect on health, emotions or luck.

Traditional correspondences

Area	Correspondence cited
Chakra	heart
Element	air or water
Signs	Libra, Taurus, Virgo according to authors
Keywords	gentleness, openness, calm

The green of the heart chakra is a modern convention; see the heart chakra. For the pink variety, see kunzite.

How to use it

As jewellery: pendant, earrings, protected ring. The cleavage calls for closed settings and caution with rings (see the gemstone jewellery guide).
As a faceted collector’s stone: a small stone in a box.
As rough crystal: beautiful striated crystals, to be handled with care.

To meditate with a green stone, see our tutorial meditating with a stone.

Care

Cleaning: lukewarm water, mild soap, soft brush, then dry. Avoid ultrasonic cleaners and steam (the cleavage can widen).
Light: kunzite fades in sunlight. As a precaution, do not leave a hiddenite exposed for long to strong light or heat.
Knocks: avoid blows, especially on an edge.
Products: no household cleaners or perfumes on the stone.
Symbolic cleansing: sound or smoke (guide).

Recognising a genuine hiddenite

The name “hiddenite” is sometimes used too loosely. A few pointers:

Intense, very clear green: check that it really is spodumene and not peridot, tourmaline, chrome diopside (see diopside) or glass.
Pleochroism: a genuine stone can look a different shade depending on the viewing angle.
Treatments: colourless or pink spodumene can be irradiated to turn green; some sellers do not mention this. Ask whether the colour is natural.
Glass: without inclusions and perfectly regular, it is suspicious.

How to choose

Look at the colour, the transparency and the absence of fractures. Hiddenite is clearly rarer and more expensive than kunzite, and good-coloured stones over one carat are uncommon. If your budget is limited, kunzite, peridot or green aventurine are more affordable alternatives.