TRNSPARENCY ROCK!!!!!

A CRYSTAL IS A SOLID MATERIAL RICHES WITH ATOMS, MOLECULES OR IONS .EVERYTHING IS ORDERLY REPEATING WITH BEAUTIFUL PATTERN .WHEN WE FORM A CRYSTAL VIA MACHANISMS IS CALLED CRYSTALLIZATION.FOR EXAMPLE - INSULINE CRYSTAL IS GROWN IN OUTER SPACE.WHILE TRAVELING IN FRANCE IN 1984,JERRY ROSENBLATT INVENTED CRYSTAL WHICH USE TO PURIFY WATER.ICE IS ALSO CRYSTAL FORM OF WATER .IT'S CALLED A POLYCRYSTALLINE STRUCTURE.IN PHYSICAL CHEMISTRY WE KNOW THAT A CRYSTAL IS FORMED IN AMBIENT PRESSURE. A CRYSTAL CAN FORM UPON SOLIDIFICATION OF SALTS,EITHER MOLTEN FLUID .VANDER WALLS FORCES IS NEEDED TO FORM CRYSTAL STRUCTURE.POLYMER IS ALSO A NEARLY FORM OF CRYSTAL BUT DIFFERENT IN THEIR MOLECULER SPACE .SOMETIME CRYSTALLINE MATERIAL EXHIBIT SPECIAL ELETRICAL PROPERTIES SUCH AS FERROELECTRIC EFFECT AND PIEZOELECTRIC EFFECT .IT ALSO HAS AN REFLECTION PROPERTIES .EARTH'S SOLID BEDROCK IS THE BEST SOURCE OF CRYSTAL MATERIAL.THUS WE CAN FIND CRYSTAL IN MANY PLACES OF THE WORLD.