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>> Group(s) : silicates, spodumenes
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This is a green variety, colored by chromium, of spodumene which is part of the pyroxene group, although green spodumene without chromium are also called Hiddenite.
Its name honors W. E. Hidden, who discovered it in 1879 in the U.S. (Alexander County, North Carolina United States). By no means its name comes from the place called Hidden, but instead is true the opposite: Hidden took this name because of the discovery Hiddenite by Mr Hidden !
It is also called "triphane" when it is colorless or yellow while purplish pink spodumene is called kunzite, the name Hiddenite is reserved for green spodumene.

Exploited sites

It is found in granitic pegmatites rich in lithium, in Burma, Brazil (Sapucaia Mines and Minas Novas in Minas Gerais ) , United States (North Carolina, California), Madagascar, Afghanistan (Nuristan, Laghman and Kunar valley).

See pictures of the mines / other pictures

Use in jewelry

To make jewelry, it is carved or faceted in levels but given its pleochroism, the table must be perpendicular to the main axis of the crystal to enhance its color. Its very easy cleavage makes the cut of large stones difficult.
Many green spodumene called "Hiddenite" lose their color nder the light: they are kunzites, heated to turn them green, who lose their artificial green, to light, in a few days as they do not contain chromium which gives them a stable green color. Nevertheless some heated kunzites retain their green color.

Daily care and precautions

not sensitive to acids and household products, but sensitive to shocks because of its cleavage.

Looking alike stones

andradite , chrysoberyl , diopside , emerald , euclase , peridot , tourmaline

Historical healing properties

Very smooth, it would bring calm, serenity and self-confidence during an examination, an interview. It would help to overcome pains, emotional pain, resented emotions.
It would have a beneficial effect on the digestive system, kidneys and bladder.

Imitations and treatments

glass and synthetic spinels

Historical stones and related legends

Giant crystals exceeding the meter has already been discovered, particularly in the United States.

Chemical characteristics

lithium aluminium inosilicate

Physical characteristics

Main color : green

Other colors : yellow

all color shades from yellow to green-emerald due to iron and chromium.

Color of streak : white

Luster : vitreous

Hardness : 6.5 to 7.0

Density : 3.15 to 3.20

Cleavage : perfect

Fracture : conchoidal, uneven

very easy cleavage

Optical properties

Transparency : transparent

Refractive Index : 1.660 - 1.680

Double refraction : 0.014

Definite, biaxial positive

visible double refraction : no

Dispersion : 0.017 (0.010)

Pleochroism : definite

Number of colors : 3

Bluish green, emerald green, yellow-green

Absorption spectrum : 690 - 686 - 620 - 437

Fluorescence : weak

Yellow - orange

Inclusions : pointed arrow or cone-shaped


Prismatic and tabular


Crystal system : monoclinic

Other informations

Astrological sign : Sagittarius, Capricorn, Aquarius

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  • Sagittarius Sagittarius
  • Capricorn Capricorn
  • Aquarius Aquarius

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