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Rhenium was targeted as a candidate for superhard metal borides because of its desirable physical and chemical characteristics. It has a high electron density, a small atomic radius and a high bulk modulus. When combined with boron, it makes a crystal with highly covalent bonding allowing it to be incompressible and potentially very hard. [47]
Jadeite is a pyroxene mineral with composition Na Al Si 2 O 6.It is hard (Mohs hardness of about 6.5 to 7.0), very tough, and dense, with a specific gravity of about 3.4.It is found in a wide range of colors, but is most often found in shades of green or white.
A coloring book (British English: colouring-in book, colouring book, or colouring page) is a type of book containing line art to which people are intended to add color using crayons, colored pencils, marker pens, paint or other artistic media. Traditional coloring books and coloring pages are printed on paper or card.
Titanium nitride (TiN; sometimes known as tinite) is an extremely hard ceramic material, often used as a physical vapor deposition (PVD) coating on titanium alloys, steel, carbide, and aluminium components to improve the substrate's surface properties.
Stishovite is an extremely hard, dense tetragonal form of silicon dioxide.It is very rare on the Earth's surface; however, it may be a predominant form of silicon dioxide in the Earth, especially in the lower mantle.
Image credits: Witty-Performer #8 - Booking flight tickets much in advance - House parties over Clubbing - Saying no to alcohol (have cut down to once in 3 months in 2024 from 3 times a month in 2023)
The fictional metals duranium and tritanium were referred to in many episodes as extremely hard alloys used in starship hulls and hand-held tools. The planet-killer in "The Doomsday Machine" had a hull made of solid neutronium, which is capable of withstanding a starship's phasers. Neutronium is considered to be virtually indestructible; the ...