The chemical composition of agate and crystal is silica, but there are some differences between the two. Crystal is a single crystal, a crystal is usually a crystal, and agate is a polycrystalline aggregate. Under the electron microscope, agate is seen. It consists of a myriad of tiny crystals of silica, so agate is usually translucent and crystals are transparent.
People's judgment on the quality and economic value of agate is generally based on the naked eye recognition as the main means. The identification of the quality of agate and the evaluation of economic value are mainly classified as follows:
1, special grade: beautiful stripes; pure color, bright red, blue, purple, pink; good transparency, that is, translucent; no cracks, no sand core, no impurities; block weight of about 5 kg or more.
2, level 1: beautiful stripes; pure color, bright red, blue, purple, pink; good transparency, that is, translucent; no cracks, no sand core, no impurities; block weight about 2-5 kg.
3, two: beautiful stripes; pure color, bright red, blue, purple, pink; good transparency, that is, translucent; no cracks, no sand core, no impurities; block weight of about 0.5-2 kg.
4, three: beautiful stripes; pure color, bright red, blue, purple, pink; good transparency, that is, translucent; no cracks, no sand core, no impurities; block weight of about 0.5 kg or less.
The Life Jacket Infant , it's a simple design with front YKK zipper for baby swimming in pool or training in the swim school. Seaskin's Toddler Life Jacket or Life Vest is made from soft neoprene SBR in 2mm, and laminated with standard nylon ( 4 way stretch ), inner is 4-6 cm EPE foam, safe and confirmtable. And Life Jacket Infant, we have two different styles, one is removable EPE foam and another one is non-removable EPE foam. So you guys can choose what you prefer for your baby.
Life Jacket Infant
Life Vest,Life Jacket,Life Jacket Infant,Toddler Life Jacket
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