![]() ![]() Diamond also occurs fibrous, massive and as severely distorted crystals.Īdamantine. Another crystal habit is ball-shaped agglomerates of radiating crystals. Crystals often have curved faces, and in some cases they be almost round. Some twinned crystals and cleavage fragments assume a triangular shape, which are known as macles. Crystals may often contain complex growth layers or triangular features known as "trigons".ĭiamond also forms in twinned crystals, and as both clean cleavage fragments and unshaped distorted fragments. Dodecahedral and hexoctahedral crystals, although less common, also occur. Most often octahedral, frequently with many crystal faces. Rarely blue, green, red, orange, pink, or purple. Colorless Diamonds are usually lightly tinged with yellow, orange or brown. When this happened, great heat and stress transformed the Graphite into Diamond, but it retained Graphite's hexagonal crystal lattice.įor additional information, see the gemstone section on Diamond.Ĭolorless, white, yellow, and brown, gray, and black. It is scientifically a different mineral than Diamond, and believed to have formed when meteoric Graphite fell to earth. Lonsdaleite (also known as Hexagonal Diamond), is a type of Diamond found with meteorites and is of extraterrestrial origin. Bort and Carbonado exhibit a slightly lower hardness than other Diamonds, and lack cleavage. The hardness and refractive index may slightly vary among Diamond specimens. Only synthetic substances and a few minor gemstones can reach or excel the refractive index of Diamonds. Rough Diamonds exhibit a greasy luster, but proper cutting give them a powerful adamantine luster. ![]() Diamond exhibits great " fire" and brilliance, which gives it a shiny, freshly polished look. When heated, a Diamond will remain hot long after the heat source is removed. Because of heat conduction, Diamonds are cold to the feel at or below room temperature. It also has the most dense atomical configuration of any mineral, and is transparent over the greatest number of wavelengths. Diamond is number 10 on the Mohs scale, and is approximately 4 times harder than Corundum, which is number 9 on the Moh's scale. It is the hardest known substance, it is the greatest conductor of heat, it has the highest melting point of any substance (7362° F or 4090° C), and it has the highest refractive index of any natural mineral. Diamond has many unequaled qualities and is very unique among minerals. ![]()
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