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In materials science, a crystal is a solid substance in which the atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions.

The word crystal is a loan from the ancient Greek word ???sta???? (krustallos), which had the same meaning, but according to the ancient understanding of crystal. At root it means anything congealed by freezing, such as ice.^[1] The word once referred particularly to quartz, or "rock crystal".

Most metals encountered in everyday life are polycrystals. Crystals are often symmetrically intergrown to form crystal twins.

The process of forming a crystalline structure from a fluid or from materials dissolved in the fluid is often referred to as crystallization. In the ancient example referenced by the root meaning of the word crystal, water being cooled undergoes a phase change from liquid to solid beginning with small ice crystals that grow until they fuse, forming a polycrystalline structure. The physical properties of the ice depend on the size and arrangement of the individual crystals, or grains, and the same may be said of metals solidifying from a molten state.

Crystal Subcategories Crystal Articles Home Made Growing Crystals by Andy Immotna Dec 12, 2008 Have you ever thought of growing crystals at home but don’t know where to start? Growing crystals at home is easy as ABC, just have a recipe. The best part when growing crystals is the process no matter what your recipe is. Basic Guide in ... Getting Started On How To Grow Crystals by Andy Immotna Dec 12, 2008 Getting started on how to grow crystals at home is possible. Learning the simple ways on how to grow crystals require patience and a basic background on the science behind it. The Basics Of How To Grow Crystals Learning the ba... Just a Little Sun, Right Eating and Vitamin D3 - Anti Aging Miracle -- Wellness Coach by Darlene Siddons May 20, 2008 Vitamin D3 is moving into the super nutrient/super food category really fast, now you need to understand that all Vitamin D is not created wual and it is critical to get the "right" kind in your diet. For years it was thought Vitamin D2, and Vitamin... Andy Warhol Paperweight Crystal by Prabakar S May 12, 2008 Printed with Andy Warhol's famous 1960s Flowers images, the set includes four square bowls that fit flawlessly onto a coordinating tray. They're perfectly sized and great for serving snacks, appetizers or condiments at your next get-together. Andy Wa... Multifunctional Bowl of Andy Warhol Campbell Soup by Prabakar S Apr 16, 2008 Andy Warhol painted familiar consumer items such as coca-cola bottles or soup cans throughout the 1960s, the earliest examples first shown in New York in 1962. Asked why he painted soup cans, Warhol replied, 'we used to drink it. we used to have the ... Andy Warhol Vases in etabletop by Prabakar S Apr 04, 2008 Andy Warhol the 1960s were an extremely prolific decade for warhol. Appropriating images from popular culture, warhol created many paintings that remain icons of 20th-century art, such as t... How To Choose The Right Wine Glasses? by Eddie Money Apr 03, 2008 Only a wine enthusiast can understand the importance of wine glass ware. The quality of glassware can greatly enhance the wine experience from bad to good or vice versa. Bowl, stem and foot are the three parts that make up a wine glass. You have to c... Andy Warhol's Paperweight Pyramid by Prabakar S Mar 16, 2008 Andy Warhol was known for breaking the rules, harnessing the latest technology to express his ideas, and creating a new movement in Twentieth century art to be studied and imitated for years to come. The Andy Warhol Home Collection is divided into fo... Empire Cup of Andy Warhol by Prabakar S Mar 05, 2008 Andy Warhol was one of the most famous and influential artists in history. Since the early 1960s, his work changed the way people thought, and caused them to take a critical look at life from the 1960s to early 1970s. Pop art and its artists existed ... Campbell Soup of Andy Warhol by Prabakar S Feb 07, 2008 Burton Snowboards and the Andy Warhol Foundation have unveiled a collaborative, limited edition hardgoods and softgoods collection at the Snowsports Industries of America (SIA) tradeshow in Las Vegas, Nevada. This one of a kind collection brings some...