Infobase

The goals of the exhibition “Treasury of St. Petersburg” are regular exhibitions held since 2014. Their key

Mother of pearl is a stone that has been known since ancient times. Essentially, it is a limestone

Man has become so accustomed to constant changes and new technologies that he has stopped paying attention to the usual

Each mark on silver belongs to one or another assay system. For example, brand 84

Deep purification (refining) of precious metals from impurities contained in radio components is a profitable undertaking. Profitability

Rhodium Atomic number 45 Appearance of the element silvery-white solid metal Properties of the atom Atomic

Gabbro-diabase We have made an attempt to thoroughly answer the question: what is gabbro-diabase, to consider all of it

Chalcopyrite is a mineral that is found on almost every continent in copper ore deposits and hydrothermal veins.

Gold nuggets are rarely found in large sizes. After all, even samples weighing one hundred grams are considered large

Over the past two decades, there has been much talk about the looming imbalance between supply and demand in