Amethyst, English name is Amethyst, from Greek, meaning "not easy to break." Chemical composition of SiO2. Trigonal crystal system, the crystal is hexagonal columnar, the column mask is horizontal stripes, there are left and right shapes, and twin crystals are common. Hardness 7. The crystal often contains irregular or feather-like gas-liquid two-phase inclusions. It is the most expensive member of the crystal family, because the crystal contains Mn and Fe3+ and is purple. It is transparent and has obvious pleochroism when observed under a dichroic mirror.
At present, the main natural amethysts on the market are glass and synthetic amethyst. Let's talk about the difference between amethyst and the two.
Amethyst and purple glass have different physical properties. They have completely different performance under crossed polarizers: when the amethyst rotates for one week, it shows four bright and four dark, while the glass is completely dark. In addition, under the magnifying glass or microscope, when the horn is seen through the gemstone, the amethyst can see two clear images of one edge, but the glass as a single refraction material does not see this phenomenon. Therefore, glass and amethyst can be distinguished by using a magnifying glass of 10 times.
Amethyst is a crystallized purple single crystal quartz. From the appearance point of view, the color tone of the general synthetic amethyst is extremely uniform, unlike the natural amethyst, there will be different changes in color depth, but the difference in color tone cannot be used as the sole basis for identification. Accurate identification can be made based on internal characteristics such as inclusions and ribbons.
The synthetic amethyst contains less gas-liquid inclusions and uniform color distribution, while the natural amethyst has a flat sheet distribution. Large volumes of synthetic crystals may contain colorless seed crystal nuclei. The other characteristics of synthetic amethyst are the same as those of natural amethyst, and it is impossible to find the difference between it and natural crystal by conventional detection methods.
Most naturally formed gemstones are stable in color and nature, while the amethyst's purple color is not the most stable state. Amethyst is easy to leg color when exposed to high temperature baking or long-term exposure, and even becomes a more stable light yellow to yellow. Therefore, high temperature and exposure should be avoided when wearing and storing. The melted prajna was soaked for 1 day every 3 months with a filter spoon. When the collectors are curing, they use them to see the roots and piles growing on the rafters. Amethyst crystal clear, color and generous, very suitable for women to wear knowledge, earrings or rings with amethyst, adding a bit of solemnity and elegance.
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