Graphite is the stable form of carbon, found at the earth’s surface. Despite the fact that they have identical chemical composition, the two minerals are drastically different. Diamond is the hardest known substance and is usually light colored and transparent, while graphite is greasy, easily powdered, and very dark in color. Diamond is the hardest gem on Mohs’ hardness scale and graphite is the softest. Diamond is very hard because of its dense packing and interlocking atomic arrangement.
It is named from a Greek word, Adamas, which means indestrucbility (O'Donoghue 1993, 104). Diamond is the known hardest mineral which have highest value 10 in the Mohs’ Hardness Scale. Diamonds are often obtained in transparent form, where blue, pale green, pink, violet, and raddish diamond are extremely rare (Cipriani and Borelli 1986, 74). It is one thought by many people that diamonds are formed from the metamorphism of the coal. However this is not the case.
A Diamond is one of the two natural minerals that are produced from carbon. The other mineral is Graphite. Even though both of these minerals are produced from the same element ,carbon, they have totally different characteristics. One of the most obvious difference is that Diamond is hard and Graphite is soft. The Diamond is considered to be the most hardest substance found in nature.
In closing we will take a brief look at the many uses of diamonds. As we begin to look at how diamonds are formed it’s important to understand a little about the composition. Graphite which is used for pencil lead and a lubricant is pure carbon just like a diamond. So the hardest mineral and one of the softest share the same composition. The difference is in the bonding.
However, nowadays people know that the diamond originated from the minerals in the world but they do not know which minerals can form a diamond. Diamond is the hardest natural substance and the most valued gemstone. Besides, together with a sparkling luster and high excellence, diamond occupies the top position compared to other gemstones. Diamond is a mineral that is mined in very intensive and evaluated more rigorously than other gems. The quality and value of a diamond is based on the four elements of color, clarity, cut, and carat.
“The geological formation of natural diamonds” The diamonds were formed from billions of years ago. The formations of diamonds originate directly from the Earth mantle, thus making it one of the natural minerals that come from deep within Earth. Due to all the hardship and worked it put through its process of becoming one most demanding gemstone, the prices of one of it is quite demanding. From using these precious gemstones when it first discoveries as a tools for everyday uses into one of the most beautiful stones in the world (industries). Generally, the majority of diamonds started out (nucleate) heterogeneously (Bulanova 1995, 1).
Diamonds are largely high-carbon crystals that were fused under maximum of pressure and temperature. Diamonds themselves are not specifically rare, with thousands being mined all over the world every year; though, huge diamonds of high quality are extremely scarce, and it is these which are well known for feature the standards of diamond as the world's most precious gemstone. Corundum - this is the second hardest kind of gemstone, and is largely defined as being quiet of aluminum oxide and many trace minerals. The trail minerals create various types of corundum, and likely the two most well-known examples of this kind of stone are sapphires and rubies. Rugged corundum is not used as are gemstones, but is used as an industrial solidity abrasive element due to its hard nature.
The brilliance, fire and scintillation which you see in your diamond ring is all related to the way the diamond is cut. An excellent cut diamond will have a lot of brilliance, fire and scintillation whereas a poor cut diamond will lack brilliance. Diamond Parts and Facets: To understand the various parts and faceting structure, let's take brilliant round cut diamond into consideration. http://www.revediamonds.com/media/wysiwyg/Facets_of_Round_brilliant_cut.jpg
D-type transition metals are mostly consisted of important metals (commercially) and the rare and unimportant metals. They are ranged from very reactive to noble. The metals in this group all form a variety of different alloys. The f-type transition metals consists of lanthanides (rare earth metals) and actinides which is from thorium to lawrencium. These metals are very reactive.