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Mineralogi & ädelstenar
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Несмотря на то, что основы добывающей металлургии известны уже много веков, всегда есть возможность усовершенствовать существующие процессы. Так и в ферросплавном производстве …
This book is about identification and description of minerals and rocks which usually starts with field scenarios followed by hand specimens, preferably under laboratory conditions …
Sodium minerals, the geographical fortunes concealed underneath the World's surface, assume a critical part in both regular cycles and human progress. These minerals, rich …
"What constitutes a precious stone is the question which, at the onset, rises in the mind, and this question, simple as it seems, is one by no means easy to answer, since what may …