Ametrine
Mineral characteristic.
Ametrine - polychrome mineral, which combines features of amethyst and citrine, two-color variety of crystalline quartz, known as amethyst, citrine, amethyst two-tone, or bolivianit Ametrine. Wine yellow citrine and amethyst violet-purple are silica species, which differ by the presence of trace impurities. In nature, there are sometimes multispectral crystals, as if combining the two minerals. This is a semi-precious stone Ametrine, which has a purple, lilac or yellow-peach shade, often they are not perfect. Sometimes Ametrine can paint over the surface in a lilac color to hide the yellowish and reddish areas, although such color - not marriage, but simply multicolored (polychrome) variety of quartz. Sometimes there are very beautiful growths of crystals of different types (large crystals of a mineral grows smaller crystals than the other).
Today, most perfectly-transparent Ametrine - synthetic crystal, on one side is yellow Citrine, the other purple amethyst. Synthetic amethyst is usually very clear, clean, bright, with no internal defects and inhomogeneities, can reach large sizes, while maintaining clarity. Ametrine typically are cut so as to best show both colors, which colors the boundary is perpendicular to the site cut stone. Ametrine is especially sensitive to sunlight and UV light compared to all other quartz.
Toxic and hazardous radioactive rocks and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity).
** - Radioactive rocks and minerals (obligatory check on a regular dosimeter + ban on the open sale of radioactivity in the event of more than 24 mR / hour + additional measures to protect the population).
All rare stones should always be checked on a regular dosimeter on the permissible level of radiation and a chemical laboratory in the absence of toxic and volatile components which are hazardous to humans and the environment.
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