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为什么这些山主要是灰色或深棕色?

观察许多山的照片，人们可以假设大多数山是灰色或棕色的。另请参阅山文在维基百科。

然而，有几种方法一座山可以形成这允许各种岩石的暴露，静止的山大多是灰色/棕色。

为什么会这样?为什么没有一座山出来橄榄石，黄铁矿，电气石或者,说,钙铀云母或其他颜色鲜艳的岩石?

回答

>……这允许各种岩石的暴露，静止的山大多是灰色/棕色。当你近距离观察时，这些五颜六色的矿物很明显。当你从远处看时，矿物质都混杂在你的视野中。我两岁的女儿准备了一个很好的例子来说明这是如何运作的:[!拿一堆漂亮明亮的水彩，把它们混合在一起，你就会得到一种灰褐色的暗色调。再举一个例子。沙子或砂岩。无聊的黄色、白色或棕色。但它基本上是石英。 Finely divided quartz, unlike any of the beautiful quartz crystals you see for sale. Grain size is an important factor of the perception of colour. ---------- That said, one of the skills geology undergraduates learn in their first year of university, is distinguishing colours in a geological context. What to the untrained eye may seem brown or grey, appears like a world of colour. I still remember that when I just started my geology B.Sc about 10 years ago, we were given a bunch of rocks that all looked grey. After one year, they did not look grey any more. They were red-grey, brown-grey, [blue-grey][2], [green-grey][3], etc. ---------- Mountains can be coloured. Here are some pictures that I took myself a while ago: [![Ardon][4]][4] [![Roded][5]][5] On a closer look I'm certain you will see that there are many colours in there: green, yellow, orange, pink, red, brown, white, black. No need for geological education to see that. ---------- > Why isn't there a single mountain out of Olivine, Pyrite, Tourmaline > or, say, Autunite, or any other brightly coloured rock? Most rocks are not composed of a single mineral. However, there are rocks composed only of olivine. They're call "dunites". Here's one: [![enter image description here][6]][6] See the rock behind? It's brown. That's because olivine contains ferrous iron. Once it's exposed to atmospheric oxygen, it becomes ferric iron. A better known name for ferric iron is "rust". This is generally the case for a lot of minerals. Colours commonly arise because of transition metals in a more reduced cationic state. Higher oxidation states are usually black, grey, red, and all kinds of earthy colours. The boring colours you see are commonly the result of "rusting" of rocks. This is also the case for pyrite. It is an iron sulfide - shiny yellow. When exposed to the atmosphere, it rusts. In fact, patches of red soil in otherwise non-red soil are an indicator for a hidden ore deposit ([gossan][7]). [1]: https://i.stack.imgur.com/iX4sd.jpg [2]: https://www.google.com/search?tbm=isch&q=blueschist&tbs=imgo:1 [3]: https://www.google.com/search?tbm=isch&q=greenschist&tbs=imgo:1 [4]: https://i.stack.imgur.com/KeduI.jpg [5]: https://i.stack.imgur.com/JNN1E.jpg [6]: https://i.stack.imgur.com/YjiTM.jpg [7]: https://en.wikipedia.org/wiki/Gossan

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\ begingroup美元显微镜可以显示出构成许多岩石的晶体中各种各样的颜色，看看构成jacpiirangite的晶体中彩虹般的颜色是如何叠加成灰色岩石的。alexstrekeisen.it /英语/冥王星/ jacupirangite.php \ endgroup美元
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2021年7月23日17:03

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