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Geography in minerals. Final part
Our journey ends with geographical points reflected in the minerals contained in decorative charoitites in northern Greenland, on the Narsarsuk plateau. It was discovered here in 1889, and later in 1990 was described by the Swedish geologist Gustav Flink. Of course, in jewelry and ornamental charoite, narsarsukite is a rare accessory mineral that does not add decorative benefits. But there are known varieties of rocks with narsarsukite, which at one time were used as a decorative ornamental stone. Well-formed relatively large crystals are used as decorative collection mineralogical material. Very rarely, small-sized faceted jewelry inserts can be made from narsarsukite.
В геммологической практике бывают весьма увлекательные случаи с диагностикой ювелирных вставок
Но помимо редкости цвета и высокой стоимости таких камней, многие розовые камни выделяются одной замечательной особенностью – они проявляют плеохроизм, то есть в зависимости от положения осмотра камня он может иметь дополнительные оттенки – оранжевый или пурпурный.
Currently, gemstones are produced by two fundamentally different technological methods - the High Pressure - High Temperature method (“HPHT”, High-pressure & High-temperature) and the Chemical Vapor Deposition (“CVD”, Chemical vapor deposition) method. The "HPHT" method is the most tested classical synthesis method, which can be used both carbon deposition on diamond from flux melts and catalytic reactions. In "CVD" synthesis, diamond growth occurs on a seed during carbon deposition mainly from a gaseous medium at relatively low temperatures and pressures.
Jewelry and precious stones are just such a category of goods, when buying which you need to pay attention to many criteria.
Sogdianite is a rather rare mineral and more often it can be found as a collection material (moreover, in systematic collections), and it is extremely rare in jewelry.