What is the hardest stone in the world?

There is no stone called diamond. Diamonds are made from diamonds by cutting. Diamond is the hardest mineral. Harder than any stone. I’m interestedConnoisseur (278) 12 years ago
Other answers
Corundum – better known under the names “sapphire” and “ruby”. Crystalline aluminum oxide – corundum (Al2O3) Depending on the structure, it has different colors and different names: ruby, emerald, sapphire, amethyst. Natural minerals: corundum. The one obtained artificially is boron nitride (borazone). Corundum The basis of any corundum is aluminum oxide. But whether it is a ruby ​​or a sapphire depends on the remaining impurities. Thus, an admixture of chromium gives the ruby ​​its red color. Sapphire has different shades, also due to chemicals. impurities. RUBICorundumSapphire Vasya, of course a diamond!
In my opinion, diamond is the hardest!
Source: My brain
Artem AbramovMaster (1010) 12 years ago
Lonsdaleite
in fact, borazon (aka Elbor) is no harder than diamond.
And the hardest is emerald
After the diamond (“brilliant”) – Sapphire. Talc, gypsum, calcite, fluarite, apatite, orthoclase, quartz, topaz, corundum, diamond – this is a “counting table” of increasing stone hardness. Industrial (black) man-made diamonds are slightly harder than natural clear varieties. That is why they can be used to polish natural diamonds. Diamond is no longer the hardest natural material in the world The hardest stone Diamonds will forever remain the girls’ best friends, but soon they risk losing their favor in the industrial sphere. The precious stone some time ago lost its title of the hardest material in the world, giving way to artificial nanomaterials of slightly greater hardness. Today, a rare natural substance looks set to leave all others behind – it is 58% harder than diamond. Zicheng Pan from Shanghai Jiao Tong University and his colleagues modeled how atoms in two substances supposedly having the properties of very hard materials would respond to a special sensor. The first is wurtzite boron nitride, which has a structure similar to diamond, but consists of different atoms. The second is the mineral lonsdaleite, or hexagonal diamond, made up of carbon atoms like diamond, but they are organized differently.
Modeling showed that wurtzite boron nitride can withstand 18% more impact than diamond, and lonsdaleite – 58% more. If the results are confirmed by physical experiments, both materials will be much harder than any known substance. But it will not be easy to carry out such tests, since both materials are not often found in nature. The rare substance lonsdaleite is formed when meteorites containing graphite fall to Earth, while wurtzite boron nitride is formed during volcanic eruptions under high temperatures and pressure. The hardest stone If successful, wurtzite boron nitride may become the more useful of the two due to its resistance to oxygen at higher temperatures than diamond. This makes it ideal for use on the ends of cutting and drilling tools operating at very high temperatures, or as corrosion-resistant films on the surfaces of spacecraft, for example. Paradoxically, wurtzite boron nitride owes its hardness to the flexibility of the bonds between the atoms that form it. When the material is stressed, some bonds change direction by almost &09ordm; to relieve stress. After diamond and wurtzite boron nitride were subjected to the same process, something in the structure of wurtzite boron nitride made it nearly 80% harder, says study co-author Changfeng Chen of the University of Nevada, Las Vegas. Scientists emphasize that in order to prove the theory, single crystals of each material are needed. There is currently no way to isolate or grow such crystals. Today there is no unified classification of semi-precious stones. there is only a conditional division. The Hardest Stone in the World (Japanese: 世界で一番固い石, Sekai de Ichiban Katai Ishi) — 71st episode of the anime Boruto: Naruto Next Generations. Mitsuki wakes up from a dream where Log and Orochimaru tried to sway him into joining one of them, surprised that he can have dreams too. In “Lightning Burger”, Mitsuki tells his friends about his first dream while wondering what he should eat. Boruto is surprised that his friend never had a dream, and Chōchō complains that Mitsuki is taking too long to order. When Boruto questions him, he admits that he never wanted to contradict his father. Shikadai and Inojin join them, and the latter has a chicken sitting on his shoulder. They explain that he hatched from an egg that appeared the day before when they were on a mission at a chicken farm and it became attached to him. When Sarada and Boruto explain that he became attached to him for a long time, Mitsuki mentally compares him to the first, having seen a photo of Boruto when he decided not to choose either Log or Orochimaru. Sarada reminds her team that they are on a mission to protect the Five Kage Summit. At the meeting, due to the topic being the Ōtsutsuki clan, they also invited the previous Kage: Kakashi, Mei and Ei. Darui notices Ōnoki’s absence and Kurotsuchi says that he came with her but ran away. They guess that he went sightseeing. Standing at his post, Boruto is bored and asks Mitsuki to tell him something interesting. Mitsuki instead asks him if he feels like his thoughts weren’t his own. He wonders if he has an attachment to his friends like the chicken has to Inojin, like a genjutsu that they can’t break. Boruto dismisses his concerns, stating that they are not chickens, and Mitsuki asks if he has any funny stories. Boruto tells them that his father told him the day before a riddle about the hardest stone in the world. They notice several shinobi nearby and Mitsuki goes to ask what’s going on there. Sarada tells Boruto that he must take Mitsuki’s problems seriously or he will stop trusting him. Boruto replies that they are good friends and that would never happen. Mitsuki returns and tells them that the shinobi are looking for Ōnoki, piqued by Boruto, who is confident that, as the Tsuchikage, he knows the answer to this riddle. As they look at his portrait, Ōnoki flies by, taking the flyer and commenting that he doesn’t look like him. Ōnoki knows who Boruto and Sarada are, but not Mitsuki. They tell him that he needs to go back to the meeting, but he doesn’t want to attend this boring event. He pretends to threaten them with Dust Release, but is caught in the back. Boruto asks him about the hardest stone, and Ōnoki says that he will tell him if instead of taking him to the meeting, they show him the village. Boruto and Mitsuki agree to this. Sarada asks about the meeting again, but Ōnoki tells her that it will be boring. At the meeting, the Kage discuss Urashiki, and Naruto says that Sasuke has gone to investigate. Kurotsuchi is annoyed by everyone’s calm attitude. In the village, when a construction beam is about to fall on a civilian, Ōnoki instantly protects the man with his dust element, impressing the genin, but falls unconscious. When he wakes up, he mistakes Boruto for some Kozuchi. When asked about this, he explained that Kozuchi was his grandson who died at a young age. As promised, Ōnoki explains the mystery of the hardest stone, stating that it is the unbreakable will of a shinobi. When Boruto and Sarada begin to argue, Ōnoki asks Mitsuki about his will, which he finds difficult and uncertain. Ōnoki tells him that if he continues to move forward, this will be his truth. Boruto asks Ōnoki not to tell Seven that he told him the answer, but Ōnoki reveals that he is the one who asked that question to Naruto, who asked Boruto without actually knowing the answer. Ōnoki tells them to visit him if they ever go to the Land of Earth, and wants to taste some more dango before returning to the meeting. After seeing Oonoki off, Boruto believes that it was a trick question, but Mitsuki found the answer satisfactory. Arriving home, Mitsuki becomes alarmed when he notices that someone was at his place and sees a letter for him, which he soon burns. Two shinobi standing guard at the border of the village are attacked by lightning.

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