Solids can be classified into crystalline and amorphous. In common solids, quartz, mica, alum, gypsum, salt, snowflakes, and various metals are crystals; glass, beeswax, rosin, asphalt, plastics, bakelite, and the like are all amorphous. Crystals and non-crystals are very different in appearance and physical properties. Crystals have a regular shape. After observing and measuring, the angles between the corresponding surfaces of various crystals are determined, while non-crystals do not have such features. Their shapes are not fixed. But sometimes through processing or long-term wear, the crystal loses its natural surface and loses its natural appearance. At this time, it cannot be judged whether it is a crystal by itself. Moreover, crystals and non-crystals can be interconverted. For example, the crystal* is heated and melted so that the temperature exceeds 300°C, and then it is poured into cold water and rapidly cooled, and * becomes soft amorphous. Instead of crystals*, they will turn into crystals after some time.
Agate is a siliceous mineral and is a type of chalcedony. It is composed of chalcedony, quartz, opal and other micro-particles of different colors and different transparencies, presenting many concentric fine crystals. Agate originates from the interstices of volcanic rocks and is precipitated from silicic acid. Because the volcanic rocks have different gaps, the level and style of agate formation are also different. When the parent rock collapses, agate will appear on the surface of the earth, often found on the waterfront or riverbed. The agate is rich in color and has always been one of the famous gemstones, found all over the world. The color image captures an agate with quartz crystals in the center.
Birkenstock shoe was invented by Johann Adam Birkenstock about 200 years before, now it is a kind of famous shoes or Sandals for its special footbed sock. The footbed is designed according to human being the feet with an arch in the middle to attach well to the feet, and it is very comfortable. After that, Birkenstock sent out the idea of flexible arch support shoe and was so popular by that time. Moreover, its outstanding character is the mid-sole made with cork, for the idea that cork material is soft and whippy. However, Birkenstock shoe is one kind of casual sandals, it can be close toe sandals, open toe sandals, or one-bar sandals. It is a kind of professional shoes. Sometimes it is designed like slides shoes, it can be made with different materials, different colors but metal buckles bling bling. It is not so suitable for formal occasions. But people can take it relax as beach sandals.
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