OCCURRENCE OF PRECIOUS STONES

OCCURRENCE OF PRECIOUS STONES

Of the primary deposits of precious stones, pegmatite deposits are the most common. However, only some of them contain valuable gemstones. Such deposits are the pegmatites of the Urals, abundant in various stones. Discovery at the end of the 18th century. …

MINERAL RESOURCES

MINERAL RESOURCES

A mineral deposit is such a natural concentration of a mineral resource or a set of mineral resources, the exploitation of which is profitable. A mineral is a mineral or group of minerals found in nature, which, directly or after processing, may be useful for economic purposes. Only …