Federal Assay Chamber (FAP) Decree “On the formation of ... the chamber” General information Establishment date 28
History and origins Tiger's eye was first discovered in South Africa in the nineteenth century.
Property Description Formula Ca2Al3(SiO4)(Si2O7)O(OH) Hardness 6.5 - 7 Density 3.35 g/cm³ Refractive index 1.691
When it comes to the weight of precious stones and metals, a term that is unfamiliar to the average person appears:
Property Description Formula NaAlSi2O6 or Na2O·Al2O3·4SiO2 Class Silicates. Hardness 6.5 - 7 Density 3.25
The hardest stone in the world is one of the modifications of carbon diamond, the formula of which is denoted
The world is ruled by numbers - Pythagoras said this. Time has proven him right: the modern era
Labradorite is a precious natural mineral with mystical properties and incredible external beauty. Labradorite stone
History and origin The history of the stone begins in antiquity. Initially, weapons were made from the green mineral
Silver is one of the rare elements that form the group of precious or noble metals. TO
