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Another highly valuable variety is chrome tourmaline, a rare type of dravite tourmaline from Tanzania. Chrome tourmaline is a rich green color due to the presence of chromium atoms in the crystal. Of the standard elbaite colors, blue indicolite gems are typically the most valuable, [32] followed by green verdelite and pink to red rubellite. [33]
Trivalent chromium plating, also known as tri-chrome, Cr 3+, and chrome(III) plating, uses chromium sulfate or chromium chloride as the main ingredient. Trivalent chromium plating is an alternative to hexavalent chromium in certain applications and thicknesses (e.g. decorative plating). [2]
Somewhat more ductile than the average for any similar armor, even Krupp's post-World War I "Wotan weich" armor, STS could be used as structural steel, whereas traditional armor plate was entirely deadweight. STS was expensive, but the United States could afford to use it, lavishly, and did so on virtually every class of warship constructed ...
Even in these uses it should be considered to be a very delicate stone. If it is used as a ring stone, the facet edges will be easily abraded, the faces will be easily scratched, and the stone might be chipped with even a slight impact. [3] It is seen as an inexpensive alternative to naturally-occurring green gemstones, such as emerald and ...
These plates are often grouped with an adjacent principal plate on a tectonic plate world map. For purposes of this list, a microplate is any plate with an area less than 1 million km 2 . Some models identify more minor plates within current orogens (events that lead to a large structural deformation of Earth's lithosphere ) like the Apulian ...
A surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup. [1]
Cutting and polishing diamonds in the Netherlands, 1946. The art of cutting a gem is an exacting procedure performed on a faceting machine.The ideal product of facet cutting is a gemstone that displays a pleasing balance of internal reflections of light known as brilliance, strong and colorful dispersion which is commonly referred to as "fire", and brightly colored flashes of reflected light ...
The basic GD&T symbol for surface roughness. Surface roughness or simply roughness is the quality of a surface of not being smooth and it is hence linked to human perception of the surface texture.