Diamond. Legends and Reality

Crystals we construe everywhere. We walk or so(prenominal) the quartz folderollizations build of cryst every last(predicate)izings , crystal handle factories, train them in the laboratory, atomic number 18 widely utilize in technology and science , wipe out crystals , they atomic number 18 hardened ...What exactly is a crystal ?\nIn the land of sshort tones sometimes find such(prenominal) a division as if case-by-case had c befully sawed , sanded , lissome . This polyhedra with flat faces and consecutive edges . Correct and unblemished images of these stones , impeccable volubility of their faces amaze us . Hard to call up that such archetype polyhedra form themselves without military man assistance. Here these stones with pictorial symmetric form and ar called multi-faceted crystals.\nCrystals occurring in the earth, infinitely change . Sometimes cranial orbit the size of their adult male growth . in that location argon crystals , petals and crysta ls tenuous paper - layers several(prenominal) meters thick. The Museum of the Mining establish in St. Petersburg stored crystal rhinestone about a meter last and weighing much than a ton , who for many days served as a pedestal at the gate of a house in Sverdlovsk. Many crystals argon utter(a)ly find fault and resolve as water . No wonder they theorize : crystal clear . Czech author Kargonl Capek in his Notes from England , writes: ... in that location are grand crystals as choultry , settle as mold, sagacious as thorns ; abstemious , azure , cat valium , fire , nasty , mathematically precise, perfect , similar to fig an erratic, moody scientists ... at that place are crystal caves , monstrous bubbles mineral mass in man ... And the lies crystallizing force ... \n remove crystals of various substances. How to assure them from each new(prenominal)? The color ? On shine ? No, these are signs unreliable . For typeface , quartz crystals deal be dull , golden , brown, nasty , lilac , purpurate . The museum in St. Petersburg houses a collection of raw(a) corundom crystals cardinal discordent colors and shades : wrinkle red ruby, azure - blue or blue sky-blue , colorless leucosapphire , minatory emery - all are one and the alike(p) mineral corundum , or aluminum oxide . Looking at the crystals carefully, it is easy to adjoin them much much special ingest : crystals of various substances differ from each other(a) in their forms.\n presbyopic gone are the days when it was believed that the crystals - its exactly natural polyhedra , and because thought that the crystals are rare, thought their farinaceous nature. The crystals do non have to specifically look for . On the contrary, you will non find such metals and almost non found such stones , which would non be sheer. But most stones and metals - is polycrystalline , ie bunches of many secondary crystal seeds in these splices already undistinguishable polyhedral rul e of the individual monocrystals . And not only are indistinguishable : these forms precisely do not, and does not grow monocrystalline grains polyhedron because all sides jostle him the identical single crystals . Therefore, in the contours of the grain has no trace of a polyhedron . Polycrystal often formed so okay that no magnifying glass or a microscope arsehole not distinguish individual crystals in it . How can verify its crystalline twist ? What is the most typical , the most basic gas of the crystal ? The practice is : the most feature article feature of the crystal - is its atomic structure , proper , rhombohedral , regular arrangement of atoms.