Joined Jul 21, Messages 9, This directionality is the secret for to how to cut diamonds. They use this to abrade away the material. The cutter carefully positions the stone to be cut so that the small stones on the grinding surface are rubbing against it in the 'soft' direction and individually polishes each facet this way.
It can be a very tedious process. It's part of the reason that cutting diamonds is a whole different art form from cutting any other stone and involves specialist artisans, special tools etc. Oldminer said:. Click to expand So in the hard direction diamond is Mohs 10, Max on the hardness scale but in the soft direction it is 9. Joined Jun 23, Messages 13, My first stone had a multi line scratch across the table after wearing it for a few years.
It would have reminded you of something scraped across a brick or something. It had not been scratched across anything to my knowledge but the scratches were there nonetheless.
I really didn't think about it at the time and traded it in although it wasn't worth much and the new stone was far more money so I'm guessing the person I traded it to didn't care about it anyway. That was many years ago too! However, now I realize that scratching that stone would have been very hard to do. It can be scratched by topaz, corundum, and diamond.
The short answer is yes. The softer a mineral is, the easier it will scratch. Even though diamond is the hardest natural material, it can chip and fracture in the course of normal wear.
While diamonds triumph in hardness and stability, their toughness presents a vulnerability that, if the conditions are just right, can cause a diamond to break. Diamond are vulnerable to chipping, fracturing, or even breaking apart along their cleavage lines.
A sparkle test is quick and easy to do since all you need are your eyes. Simply hold your diamond under a normal lamp and observe the bright shimmers of light bouncing off the diamond. A real diamond provides an exceptional sparkle since it reflects white light extremely well. As an example, you can scratch steel with a diamond, but you can easily shatter a diamond with a hammer.
The diamond is hard, the hammer is strong. Whether something is hard or strong depends on its internal structure. A diamond is made entirely of carbon atoms which are joined in a lattice-type structure. The melting point of Diamond at about , atm is K, which is much higher than the temperature of lava. So, it is impossible for lava to melt a diamond. A diamond is carbon and will burn just like charcoal. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.
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Diamonds happen to be the hardest known mineral or gem on the planet. Diamonds are ranked a 10 on the Mohs Scale of Hardness ; all other minerals are ranked 9 or below. Anything with a hardness below that of a diamond cannot scratch a diamond.
That means only a diamond can scratch a diamond. Still, there are countless myths floating around to the contrary. Both graphite and diamonds are made entirely out of carbon, yet exist on nearly opposite ends of the Mohs scale. How can carbon be both soft and hard? Diamonds are made of carbon atoms arranged in a strong, almost immovable tetrahedral lattice structure.
For example, if you hit a piece of steel with a hammer the steel will absorb the impact by flexing its atomic structure. No, sandpaper cannot scratch a diamond. The hardness of sand paper grit ranges between 7 and 9 on the Mohs scale, which makes sand paper softer than a diamond.
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