| |
| | Post Date: 2007-1-9 Expiry date: 6 months |
| |
| Short Message |
TEL: 86-22-27426393 27373087
FAX: 86-22-27373071 |
| Detail |
Obsidian:
Composition : Oxidize the hardness of silicon for two mainly: 5. 5 proportion: 2.35 Refracting rate: 1.48-1.51 . One natural glass, transform for volcano into after cooling rapidly by lava, so difficult with the crystallization. Non- brilliant quality, has not solved paying attention to , the fracture takes the form of shell. The color is on and black, but there is brown, semitransparent, does not have and transparent, does not there is not impurity , one is big, process ornaments, the handicraft , the first-class materials of I-go , the chess, etc., use in the building materials, industrial chemical industry, etc. at the same time .
|
|
|
