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Amblygonite

>> Group(s) : phosphates
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The German mineralogist Breithaupt described and identified it in 1817.
Its name comes from the angle formed at its cleavage, in Greek "Amblus" meaning "obtuse" and "Gonia" which means "angle", as opposed to scapolite with which it was often confused.
It forms a continuous series with the montebrasite between a fluorinated pole and an hydroxylated one , the refractive index and birefringence increases from the fluorinated pole (amblygonite) to the hydroxylated pole (montebrasite).
The majority of gems called "amblygonite" are chemically closer to the “ montebrasite ".

Exploited sites

It has been found in France at Montebras in the Creuse region, in Mas-Barbu in the Haute Vienne, in Echassieres in the Allier, nowadays it’s found in Mogok in Burma, in Brazil (Minas Gerais, Sao Paulo), the United States States (California), Sweden (Varuträsk) and Namibia ( in its lilac variety).

See pictures of the mines / other pictures

Use in jewelry

Rarely used in jewelry because of its easy cleavage that makes it fragile. When cut, it is with many facets and both the cutting and polishing are delicate.

Daily care and precautions

It is fragile, it is a stone for collection.

Looking alike stones

apatite , beryl , brazilianite , chrysoberyl , hiddenite , orthoclase , scapolite , tourmaline

Historical healing properties

It would have, in the yellow variety, the same properties as the orthoclase in the area that would encourage creativity, and would have a beneficial role in digestion and elimination of toxins.
It would promote the commitments in projects for humanistic purpose, great humanitarian causes and religious ones, it would help to understand others and improve the understanding of the pedagogical relationships, particularly in the children’s education field.

Imitations and treatments

To date no synthesis.
It can undergo radiation treatments and then it takes a green, green-lemon yellow or blue tint. The color is stable in the light but disappears if the stone is heated.
The irradiated amblygonites are pink in Chelsea filter.

Historical stones and related legends

The Smithsonian Institution in Washington maintains the largest Brazilian cut amblygonite, some of whom excess the 50 carats, a rarity for this stone whose crystals are never very large.

Chemical characteristics
(Li,Al) [PO4] F

alkaline phosphate of aluminum

Physical characteristics

Main color : yellow

Other colors : blue, colourless, mauve, green, purple

Color of streak : white

Luster : vitreous, greasy

Hardness : 5.5 to 6.0

Density : 3.00 to 3.10

Cleavage : perfect

Fracture : uneven

pearly on the cleavage

Optical properties

Transparency : transparent

very rarely found in transparent variety

Refractive Index : 1.580 - 1.615

Double refraction : 0.018

Definite, biaxial (+/-)

visible double refraction : yes

Dispersion : 0.014 (0.008)

Pleochroism : absent

Number of colors : 1

Almost impossible to notice

Fluorescence : very weak

Sometimes traces of pale green fluorescence

Inclusions : negative crystals with or without gas bubbles

Crystals

Prismatic up to 5 cm, but often in aggregates

cristaux

Crystal system : triclinic

Other informations

Astrological sign : Leo, Scorpio, Sagittarius

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Correspondance
astrological
  • Leo Leo
  • Scorpio Scorpio
  • Sagittarius Sagittarius

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