№ 613-616. The 300th anniversary of rock-geological service in Russia

Charoit. Called after the only mineral deposit near the river Chara in eastern Siberia. This is a less-common mineral, a valued stone and a complex silicate. In close concretion with other minerals forms finely-fibred silky units (complex of mineral grains) of various tinges of violet.

Hematite. Contains up to 70% of iron. The colour of the mineral may be from fulvous-red to black.The crystals have semimetallic or diamond shine. Hematite crystals form beautiful units called hematite roses.This mineral ores are one of the most inportant iron ores. Steel and cast-iron are melt out of hematite. The main Russian deposits are Kursk position variation, Ural, Siberia.

Rock-crystal. An uncoloured glassy variety of quartz crystals. Can be found as single crysal or some crustals assembled in druses, sometimes weighing up to a ton. Is used in the optics, glassworks and jewelworks. The main deposits in Russia are - Ural, Altai, Yakutia.

Gold. One of the most ancient minerals people know. Soft, of a bright-yellow color. Often can be found in different minerals as small grains. Gold contains notable admixture of silver. It can be often found in hydrothermal lodes with quartz, carbonates and sulphides. Is won from deposits, where it gets into due to the erosion of ledge ores. Big natural units of native gold in ledge ores are referred to nuggets. Ural and the area of the river Lena in eastern Siberia are very rich of the nuggets.