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Rosefire Phoenix

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Rose, amethyst & a little magic

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Forever SnS Crystal Passport

Amethyst

Pronounced: a - muh - thist

Amethyst is the purple variety of quartz, coloured by iron-related defects and natural irradiation within the crystal. With a Mohs hardness of 7, it forms in geodes and mineral veins and is found worldwide, notably in Brazil, Uruguay and Zambia.

Formula: SiO₂Mohs hardness: 7System: Trigonal
Collage showing several forms of natural Amethyst, including a druzy freeform, crystal cluster, sterling silver Amethyst earrings and a polished Amethyst point.CW

Meet the crystal

About Amethyst

Amethyst is the purple variety of quartz and one of the world’s most recognisable gemstones. Its colour can range from delicate lilac and soft lavender to deep violet, sometimes displaying bands or zones of different shades within the same crystal. These natural variations mean that every specimen has its own distinctive appearance. Like other varieties of quartz, amethyst is composed of silicon dioxide. Its purple colour develops when small amounts of iron within the crystal structure interact with natural irradiation over geological time. Amethyst commonly forms inside cavities, mineral veins and volcanic rocks, where individual crystals can grow together to create sparkling clusters and impressive geodes. With a hardness of 7 on the Mohs scale, amethyst is relatively durable and has been used in jewellery, decorative objects and collections for thousands of years. Important deposits are found in several countries, including Brazil, Uruguay, Zambia, Namibia and Madagascar, with each location producing crystals that may differ in colour, clarity, crystal shape and overall character. Amethyst also has a rich place in folklore and human history. Its name comes from the Ancient Greek word *amethystos*, meaning “not intoxicated”, reflecting an old belief that it could protect its owner from drunkenness. Today, it remains popular for its beautiful colour, fascinating natural formation and the remarkable variety found from one specimen to another.

Explore this passport

Showing Science & Formation

Scientific passport

The mineral facts

Observable and measurable properties used to describe and identify this mineral.

Chemical formula
SiO₂
Mineral class
Silicate (tectosilicate); quartz group
Crystal system
Trigonal
Mohs hardness
7
Lustre
Vitreous
Streak
White
Specific gravity
2.65
Transparency
transparent to translucent

Common colours

Pale violet, lilac, lavender purple, violet, bluish purple, reddish purple and deep royal purple. Colour zoning from pale to dark purple is also common.

Cleavage and fracture

Amethyst has no true cleavage. It is brittle and normally displays a conchoidal to uneven fracture, which can produce smooth, curved, glass-like broken surfaces.

From the Earth

How it forms

The geological processes that create this crystal over time.

Formation

Its geological story

Amethyst grows when silica-rich fluids crystallise inside cavities, fractures and mineral veins. It is especially well known for lining geodes within volcanic basalt. Small amounts of iron become incorporated into the growing quartz, and natural irradiation over geological time creates the colour centres responsible for its purple appearance. Some geodes contain outer layers of chalcedony and colourless quartz before developing amethyst crystals towards the centre.

A closer look

Scientific notes

Amethyst is macrocrystalline quartz composed of silicon dioxide. Its purple colour is produced by iron-related defects in the crystal structure that are activated by natural ionising radiation. Natural specimens may display uneven colour zoning and slightly different bluish-purple and reddish-purple colours when viewed in different directions. Heating amethyst can change it to yellow, orange, brown, colourless or, in some cases, green. Hydrothermal synthetic amethyst has the same basic composition and many of the same physical properties as natural amethyst, so difficult specimens may require professional laboratory testing.

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