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The heat treatment process itself is the most common refinement method.
In simple terms, diffusion is a surface staining of a stone. Most often, diffusion enrichment is used for corundums, in particular sapphires.
So, tanzanite is called a jewelry variety of the mineral zoisite, aluminum silicate and calcium. It was opened in the middle of the 20th century in Tanzania and, due to the color similarity, was first mistaken for sapphire, but it was further established that this conclusion was erroneous.
To begin with, we will clarify what is Icelandic spar. This is a transparent variety of calcite, often colorless, but sometimes can have a slight shade caused by various impurities.
Что означает приставка "трапиче"? Сам термин обозначает давилку для сахарного тростника, похожую на колесо с перемычками и имевшую широкое распространение в Латинской Америке в 19-20 веках.
