Infobase
Even for the most indifferent people to jewelry, diamonds touch the heart - the beauty of this
Jewelry stones and gems are valued for their transparency, ability to refract light, or for their beautiful
Category Hydroxyls (minerals) Name in English. Goethite Formula α-Fe3+O(OH) Group Aqueous oxide group Color
How much does an ounce of silver weigh in grams? Every person who decides inevitably faces this question.
Category Oxides (minerals) Name in English. Pyrolusite Formula MnO2 Group Quartz Group Color Black, Gray
Post updated: May 26, 2020 Medical gold is noble jewelry that is very similar to
On geographical maps, an attentive reader must have noticed circles, squares, diamonds and other icons. These
Disadvantages of shell rock There are not many of them, and they can be corrected: The stone requires careful handling,
For centuries, gold was considered the most valuable noble metal, which played a key role in
The classic color of the mineral is white, with a bluish iris, but pearl tints are not always
