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青石英[Blue Quartz] [2005-8-20]
iamet 发表在 ℃〖化学〗
| | A blue quartz whose color is caused by FeTiO3 precipitate. Blue quartz is found only in old rocks, since the exsolution process by which ilmenite is precipitated is very slow. |
学好数理化，走遍天下都不怕！ | |
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