Akwamaryn (akwamaryna). Aquamarines are very popular gemstones. They are transparent, blue-green color. This color can be obtained by heating some varieties of beryllium. Darker shades are especially sought after, which, however, never reach the depth of the emerald color. The name of aquamarine was introduced by Beotius de Boot, author of the history of precious stones published in Latin (1609), due to its color similar to that of sea water (pour. aqua marina - sea water).
The beautifully colored aquamarines were first mined in the 18th century. from the sands of Brazil. The most important areas for aquamarine occurrence are: Brazil (Minas Gerais, Bahia, Marambaia, Holy Spirit) in Madagascar (Tananariwa, Antsirane, It lasts in.). They are also found in the Urals (Murzinka, the Ilmenian area near Miask), in Siberia, in India (Madras, Pettalai) and Ceylon, In Australia (New South Wales), in South-West Africa (Spitzkopje) i w USA (California, Kolorado, Connecticut, Maine, North Carolina).
The most common form of aquamarine cut is a step cut, sometimes combined with a scissor cut. In order to use the elongated form of the crystals, a rectangular or oblong-oval cross-section is used. The cut of lightly colored stones must be of the appropriate thickness. After World War II, the price 1 a carat of aquamarine was 3-100 West German marks.
|Mohs hardness||Density in g / cm3||Factor
|Double light refraction||Breath-
|Beryllium glass (akwamarynowe)||6,5||2,44||1,52||–||–|