我和我的一些朋友想知道到底是什么白色涂层上我们可以看到玉髓quartenary期间被一条河流沉积(所以原始材料受损,有很多裂缝)。这是一个例子:[!(在这里输入图像描述)[1]][1][!(在这里输入图像描述)[2]][2][!(在这里输入图像描述)[3]][3][![在这里输入图像描述][4]][4]的白色涂料是什么?蛋白石吗?美蛋白石?到目前为止,我发现一切都是这个链接:http://www.treasurenet.com/forums/north-american-indian-artifacts/238703-agate-arrowhead-white-patina-question.html这些人形容它是“包浆”或“玉髓风化”。我wodering过程是什么,我们如何能轻易化学的或物理的解释一下吗?我认为这一定是某种风化……类似于氧化。 I believe that it is opalization. What do you think ? I saw this forming on many agates all over the world, but only at these, that were eroded from the mother rock, transported and deposited. It is especiially common on deposited chalcedony. Thank you. [1]: https://i.stack.imgur.com/jz4jW.jpg [2]: https://i.stack.imgur.com/cZyYa.jpg [3]: https://i.stack.imgur.com/Z424J.jpg [4]: https://i.stack.imgur.com/Nxhl1.jpg