| Opal - decorative stone |
| Thursday, 22 July 2010 09:05 |
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Opal is given as a symbol of hope, happiness and truth. Color: Opal is generally colorless, but such material is rarely found. Seeded impurities generally give the opal a variety of body dull going to paint the colors range from yellows and reds wywiodły from iron oxides to black from manganese oxides and organic carbon. Jewelry from Opal. Milk yield many white and gray opal is possible to assign to the abundance of small isolated gas - you filled cavities in them. Precious opal reflects light up the game by the brilliant colors visible spectrum, red being the most valued. Description: Amorthous Silica, SiO2 + nH2O, fixed jelly so it does not have any crystal structure and contains up to 13% water. Precious opals are translucent to transparent and are distinguished by a combination of milky to pearly opalescence and an attractive play of many colors. These colors flash and change as the stone is Viewed from different directions are caused by interference of light along minute cracks and ... read full article |