open 10 am - 7 pm
laboratory is closed
Interesting minerals of charoite rocks. Benston-Benstonite
The mineral is found in charoite rocks in the form of a rare accessory admixture, but it is a rock-forming material for the adjacent benstonite carbonatites, which are a promising source of barium and strontium. The mineral benstonite, with the chemical composition Ba6Ca6Mg (CO3) 13, was first discovered by Orlando Joel Benston (1901-1966), after whom it was later named. The newly discovered mineral was investigated by the German geologist Friedrich Lippmann (1928-1998) from the University of Göttingen (Federal Republic of Germany). Samples in which the mineral was discovered were taken at a barite mine, Magnet Cove near Malvern, Arkansas, USA. Orlando J. Banston during this time worked in the beneficiation division of the National Lead Co. metallurgical company in Malvern.
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.