What is chalk made from: chalk deposits, extraction, composition and application
October 29, 2018 Production Ekaterina Ryzhkova What is chalk made of? What kind of connection is this
Coins
We answer the audience: Gold investment coins and their secrets
Post updated: July 19, 2020 Numismatists have their own definitions of the value of certain coins.
Rough stones
Composition, structural formula and other features of diamond
Hello dear readers. As you know, diamond, despite its bewitching appearance, is
types of gems
Famous stones: sapphire, ruby, spinel, opal and topaz
Since ancient times, people have used precious minerals to make jewelry. First, using description and observation methods
Diamond and graphite
Comparison of graphite and diamond by physical properties
Hello, our dear readers! Have you ever wondered, diamond and graphite - what could be
Ancient silver items with blackening
What is blackened silver? Products, features, properties and reviews
Metal oxidation Rhodium plating Silver plating with ruthenium Use Product care Several thousand years ago
chameleon ring photo
Mood ring: operating principle, color meanings
I have always been interested in esotericism: various unusual things that often defy logical explanation, but
Black spinel Magical properties of the stone
Black spinel: what kind of stone is it, magical properties, who can wear it
Black spinel - the history of the name About what spinels are and how they appear
Amber
Amber - magical and healing properties of fossilized resin
The color of amber fascinated people thousands of years ago; “honey drops” served as talismans and amulets. frozen gold
Gold bars
999 standard gold and silver: properties of the highest standard, pricing on the international market, use of metals, recommendations for selection and care
Post updated: Jun 6, 2020 999 gold actually contains no impurities,
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