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The interior of Caloris also harbors several unusual dark-rimmed craters, which are visible in this image. The MESSENGER science team is working with the 11-color images in order to gain a better understanding of what minerals are present in these rocks of Mercury's crust. The diameter of Mercury is about 4880 kilometers (3030 miles).
Mercury is one of four terrestrial planets in the Solar System, which means it is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of 2,439.7 kilometres (1,516.0 mi). [4] Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan.
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Mercury was once used as a gun barrel bore cleaner. [124] [125] From the mid-18th to the mid-19th centuries, a process called "carroting" was used in the making of felt hats. Animal skins were rinsed in an orange solution (the term "carroting" arose from this color) of the mercury compound mercuric nitrate, Hg(NO 3) 2. [126]
Cinnabar (/ ˈ s ɪ n ə ˌ b ɑːr /; from Ancient Greek κιννάβαρι (kinnábari)), [7] or cinnabarite (/ ˌ s ɪ n ə ˈ b ɑːr aɪ t /), also known as mercurblende is the bright scarlet to brick-red form of mercury(II) sulfide (HgS).
The subtle color was chosen to reflect the need for greater harmony. Indeed, much like the warm, cozy feeling that comes with enjoying whipped chocolate, this color offers a sense of instant comfort.
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Several of the CPK colors refer mnemonically to colors of the pure elements or notable compound. For example, hydrogen is a colorless gas, carbon as charcoal, graphite or coke is black, sulfur powder is yellow, chlorine is a greenish gas, bromine is a dark red liquid, iodine in ether is violet, amorphous phosphorus is red, rust is dark orange-red, etc.