Understand the Composition and Formation of Amethyst crystals.

Amethyst crystals, aren't just beautiful to look at—they also have an interesting scientific story behind their formation and composition. 

What is Amethyst?
Amethyst is a type of quartz, which is one of the most common minerals on Earth. Quartz is composed mainly of silicon dioxide (SiO2). The unique purple colour of Amethyst comes from the presence of iron and other trace minerals within the crystal structure. When these minerals are exposed to natural radiation over time, they give Amethyst its distinctive violet and purple colours.

How Does Amethyst Form?
Amethyst crystals typically form inside geodes. Geodes are hollow, rounded rocks that are often found in volcanic areas. Here’s a step-by-step look at how Amethyst crystals form:

Formation of Geodes: Geodes start as bubbles in volcanic rock. When lava cools, it can trap gas bubbles inside, creating hollow spaces.
Mineral-Rich Water: Over time, water rich in minerals, including silicon and iron, seeps into these hollow spaces.
Crystal Growth: As the water evaporates, it leaves behind the minerals, which start to crystallise. The silicon dioxide forms a base of quartz, and the trace amounts of iron give the crystals their purple colour.
Natural Radiation: The final touch comes from natural radiation in the surrounding rocks, which changes the colourless quartz into beautiful purple Amethyst.

Why Does Amethyst Vary in Colour?
The colour intensity of Amethyst can range from pale lilac to deep violet. This variation depends on the amount of iron present and the level of natural radiation the crystal has been exposed to. Generally, the deeper/richer the colour, the more valuable and higher grade the Amethyst.

Conclusion
Understanding the composition and formation of Amethyst crystals gives us a greater appreciation for these natural wonders. From the bubbling lava of ancient volcanoes to the shimmering geodes we admire today, Amethyst’s journey is a remarkable testament to the beauty and complexity of nature. Next time you hold an Amethyst crystal, you'll know the incredible process that created its beauty!