Category Oxides Name in English. Ruby Formula Al2O3 Group Corundum Group Color Red, Red-brown,
Color Black, dark brown Hardness on the Mohs scale 2.5 - 3.5 Density g/cm3 1.3 -1.4
History of Russia and Europe, the stone was introduced in the 16th century by merchants who brought it from India.
Category Rocks Name in English. Obsidian Formula SiO2 Group Acid Rock Group
How wonderfully precious opal plays! It has the shine of the sun and the ebb of the moon. In him
By date of birth October 24 – November 2 Born from October 24 to 2
History and origin The history of the stone begins in antiquity. Initially, weapons were made from the green mineral
Why is amber called the sun stone? In terms of its composition, amber stone has an amorphous structure and
History and origin No one knows the exact time of discovery of marcasite. It is only known that about
Aquamarine is compared to everything: with a clear tropical sky, sea water, with pieces
