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One of the very first types of ancient stone mosaics that have come down to us are polygonal masonry in the ancient "cities of the gods", spread throughout the world - in Egypt, India, China, Peru.
Many opaque gemstones are prized for their vibrant color, and for some, the color is so prized that even dust is used.
The name of the mineral is given by the first find of this variety - Mount Lovchorr in the Khibiny tundra.
Noble opals of bright blue, purple-red, green colors are often found on the jewelry market.
Howlite is used not only as an imitation of turquoise, but also as an independent jewelry and ornamental material, as well as for imitation of coral, which is less successful in comparison with turquoise, from which it is easily distinguished by the absence of growth structures.
