The amethyst is violet quartz due to the iron oxide that according to the astrological tradition especially benefits those born under the sign of Aries.
Its name, derived from the Greek term amethustos, means "he who is not drunk". In fact, during the middle Ages, people drank in amethyst cups so as not to get drunk. It is ideal to treat addictions, such as alcoholism and drug addiction and its crystals offer tranquility and balance, as well as attract good luck and stimulate creativity and memory.
Green amethyst stone lilac sparkles, as well as its crystalline structure, have seduced jewellers and goldsmiths from all over the world since antiquity for their attractive and enigmatic colour. Nowadays, the amethyst continues to be the protagonist of numerous collections and extraordinary unique pieces.
You can choose amethyst according to your birthstone colours by month.
Physical and optical properties of the amethyst
Amethyst for sale is a natural mineral found in the form of purple crystals of the trigonal-trapezohedral crystalline class and belongs to the family of silicates.
- Type: variety of quartz. Basic type: igneous, sedimentary and metamorphic.
- Colour: violet at temperatures below 300 ° C.
- Structure: hexagonal crystal. Chemical composition: phenocrystalline or microcrystalline variety of quartz with iron oxides and smaller amounts of other elements. Amethyst birth month can be found out from Google.
- Formation: it forms in veins with solutions rich in iron oxides that give that characteristic colour at temperatures below 300 ° C.
- Hardness: increasing hardness of 7, according to the Mohs scale.
- Density: 2.65. Brightness: fatty in vitro.
The colours of the amethyst
The amethysts have all the shades of pale purple colour rising to an almost dark purple colour. But you can also find rare varieties of green. Different colour amethyst can be buying according to birthstones for all months.
Some stones are pure and intense, while others shine with red, purple and blue streaks. Its rate is reasonable compare to white topaz price.
Rich in iron oxide
This mineral can appear colour by zones with transparent quartz or yellow, and its tips are usually darker or degrade to colourless quartz. It forms in veins with solutions rich in iron oxides.
In general, amethysts are located inside agates in the form of geodes, either as crystals that cover the surface of a stone, or in veins accompanied by other minerals.
The main deposits of amethyst
Of magmatic origin, the amethyst is formed from the crystallization of silica.
Iron is responsible for the characteristic violet colour of the amethyst, although this well-known tone reacts to heat: when heated to over 300 ° C, the amethyst changes its colour - due to changes in the valence of the iron it contains - Brown, yellow, orange or green coffee, according to its quality and place of origin. At 450 ° C it turns yellow, at 500 ° C it becomes a strong orange colour, and at 600 ° C it becomes very milky.
However, the amethyst may recover its original colour after being irradiated. In any case, the stones that have been treated to heat, are different from those that do not, by presenting a dichroism bluish purple and reddish purple.