Metal casting
Expendable mold casting methods Expendable mold casting includes sand, plastic, shell, plaster, and investment (lost-wax technique) moldings. These methods use temporary, non-reusable molds. Widely used for casting complex shapes in...
Glossary
Melting point
Definition and Importance of Melting Point The melting point is the temperature at which a substance changes from a solid to a liquid state. It is an important characteristic property...
Matryoshka (diamond)
Matryoshka Diamond Characteristics Weight: 0.62 carats (0.124g) Color: Colorless Country of origin: Russia Mine of origin: Nakynskoye field Discovered: October 2019 Matryoshka Diamond Description Double diamond with a second diamond...
Material properties of diamond
Material properties of diamond Hardness: Diamond is the hardest known naturally occurring material, ranking 10 on the Mohs scale of mineral hardness. Crystal structure: Diamond has a specific type of...
Matchmaking
Traditional Matchmaking Practices Traditional matchmaking is a folk program in Russian museums. Matchmakers like the Ashkenazi Jewish shadchan and Hindu astrologers were considered essential advisors. In cultures with arranged marriages,...
Marriage vows
History and Evolution of Wedding Vows In the time of the Roman Empire, lower classes had free marriages. Wealthy Romans signed documents to legalize their unions. The oldest traditional wedding...
Marriage license
History and Purpose of Marriage Licenses Marriage licenses began in the Middle Ages to permit marriages that would otherwise be illegal. Initially issued to ensure the necessary period of notice...
Marital status
Definition and Legal Recognition of Marital Status Civil status or marital status describes a person's relationship with a significant other. Examples of civil status include married, single, divorced, and widowed....
Marcel Tolkowsky
Background and Contributions Marcel Tolkowsky was a Belgian member of a Jewish family of diamond cutters from Poland. He is acknowledged as the father of the modern round brilliant diamond...
Marcasite jewellery
Definition and Composition Marcasite jewellery is made using cut and polished pieces of pyrite as a gemstone. Pyrite and marcasite are chemically iron sulphide. Pyrite is more stable and less...