Jack crystal white oval smooth jewelry DIY accessories Stone crafts colorful length of 400 mm |

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1, natural crystal - - - - - also called quartz, natural crystal and become,, the main component is silica. Color is more yellow (a small amount of purple and dark brown), hardness at about eight around 2000 degrees to melt, only sculpture and polishing into small products, not processed into large vessels.  2, artificial crystal - - - - - (lead crystal, lead-free crystal, crystal elim)  (1), lead crystal: is quartz sand (main ingredients silica) to add a certain content of lead smelting and become,. Lead can make its hardness is reduced, hardness is about 4  Characteristics (1) : mass weight, soft, resistant to cutting, (2) the high transparency, refraction performance is good, (3) rap have metallic sound. (is different from common glass biggest characteristic)  (2), lead-free crystal: in quartz sand into the quality of potassium carbonate, potassium instead of lead element, also known as potassium glass, its hardness about six.  (3), crystal Lynn: potassium glass in solution by adding different metallic element, make the crystal glass present different color. Called color crystal glass, hardness is 6.  Features: (1), glittering and translucent, refraction performance is good, (2) the high hardness, toughness, relative resistance to impact, more suitable for glass table hand-cut and describe. (3) keep and transcend the lead crystal metal acoustic characteristics. Lead-free crystal the biggest characteristic is: the combination of light and sound