任务
1. 观察花岗岩中的云母： 仔细观察地砖。你在花岗岩地砖中看到的云母是什么颜色的？是白云母（浅银色）还是黑云母（深黑色）？
2. 云母晶体： 描述你所看到的云母晶体的大小。它们是细小而均匀分布的，还是可以看到较大而明显的晶体？估计可见云母颗粒的最大尺寸。
3. 云母的功能：思考云母在花岗岩地板材料中的作用。为什么云母对花岗岩在地砖中的应用很重要？
4. 可选项： 给自己或现场的物品拍一张照片。
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云母是一种闪闪发光的矿物，常见于花岗岩中。这个 EarthCache 站点将带你到一个花岗岩被用作地砖的地方。花岗岩是一种火成岩，通过岩浆的缓慢冷却在地表深处形成。在这一过程中，包括云母在内的各种矿物质逐渐形成，赋予了岩石独特的外观。
在这个 EarthCache 中，你将了解到更多有关花岗岩形成的知识，云母在其中扮演的角色，以及这些矿物质如何使这种广泛用于建筑的石材更加光亮和稳定。
什么是花岗岩？花岗岩是岩浆经过数百万年缓慢冷却后在地球深处形成的一种柱状岩石。在此期间，各种矿物形成大晶体。花岗岩的主要成分是
石英--一种坚硬的玻璃状矿物，赋予花岗岩强度。
长石--通常为白色或粉红色，是花岗岩中最丰富的成分。
云母--使花岗岩闪闪发光。
花岗岩中的云母：在花岗岩中，云母通常以白云母或黑云母的形式出现。云母呈浅银色，而黑云母呈深褐色至黑色。这些矿物在地砖中形成薄而闪亮的层。云母不仅影响视觉外观，还在花岗岩的地质学中发挥作用。
花岗岩和云母的形成： 你在这里看到的花岗岩是数百万年前地壳深处的岩浆缓慢冷却形成的。这种缓慢的冷却使得包括云母在内的大晶体得以形成。这些晶体以密集的模式生长，形成了岩石的典型结构。
云母的形成取决于硅、铝和其他元素的可用性。根据花岗岩的化学成分和冷却条件，会形成不同类型的云母。白云母的形成条件与黑云母不同，因此颜色和性质也各不相同。
Tasks:
1. Observe the mica in the granite: Take a close look at the floor tiles. What color is the mica you see in the granite tiles? Is it muscovite (light and silvery) or biotite (dark and black)?
2. Mica crystals: Describe the size of the mica crystals you can see. Are they small and finely distributed, or can you see larger, distinct crystals? Estimate the maximum size of the visible mica particles.
3. Function of mica: Think about the role mica plays in granite as a flooring material. Why might mica be important for the use of granite in floor tiles?
4. Optional: Take a picture of yourself or an object at the site.
Please send your answers to the questions to silka03.earthcache@gmail.com. Do not post them in your log!
You can log immediately after submitting your answers. You don't need to wait for log approval!
Enjoy!
Mica is a shimmering mineral commonly found in granite. This EarthCache station takes you to a location where granite is used as floor tiles. Granite is an igneous rock that forms deep below the Earth's surface through the slow cooling of magma. During this process, various minerals, including mica, develop, giving the rock its characteristic appearance.
In this EarthCache, you will learn more about the formation of granite, the role mica plays in it, and how these minerals contribute to the shine and stability of the stone, which is widely used in construction.
What is Granite? Granite is a plutonic rock that forms deep within the Earth when magma cools slowly over millions of years. During this time, large crystals of various minerals develop. Granite is primarily composed of:
- Quartz – a hard, glass-like mineral that gives granite its strength.
- Feldspar – often white or pink and the most abundant component of granite.
- Mica – responsible for the shimmering shine in granite.
Mica in Granite: In granite, mica commonly appears in the form of muscovite or biotite. Muscovite is light and silvery, while biotite is dark brown to black. These minerals form the thin, shiny layers you can observe in the floor tiles. Mica not only affects the visual appearance but also plays a role in the geology of granite.
Formation of Granite and Mica: The granite you see here formed millions of years ago through the slow cooling of magma deep within the Earth's crust. This slow cooling allowed large crystals, including mica, to develop. These crystals grow in a dense pattern, giving the rock its typical structure.
The formation of mica depends on the availability of silicon, aluminum, and other elements. Depending on the chemical composition and the conditions under which the granite cools, different types of mica form. Muscovite forms under different conditions than biotite, which leads to the varying colors and properties.
https://www.kristallin.de/gesteine/minerale_4.htm
https://www.igw.uni-jena.de/3894/granit
https://www.mineralienatlas.de/lexikon/index.php/RockData?lang=de&rock=Granit