Reflection on Rocks and Minerals

In the new unit on rocks and minerals I have learned a lot of interesting things which I didn't know before. For example I did not that all the rocks on this planet have been formed in three ways and could be divided in to just three groups: sedimentary rocks, igneous rocks, and metamorphic rocks.I also learned that the rocks are formed through rock cycle which consists of three phases, which are: melting,crystallization, sedimentation. Unlike rocks all minerals have a crystal structure and definite chemical composition. This was also a new information for me. The most fascinating information I have learned is that all crystals grow which we actually have learned before when we did our growing crystals project but then I didn't understand that the same process occurs in nature and in the whole universe. We have also learned that rocks can not be minerals But they are made of minerals.The most precious minerals is an diamond which is one of the rarest and the hardest substances on earth. There are many different minerals and stones on this planet but some of the most interesting are: marble,granite, and limestone and amethyst, quartz, and diamond. Marble is a beautiful, relatively soft whitish yellowish rock which is used for sculpting, building, and house furnishing. The most famous sculptures have been done in marble. Granite, on the other hand, is a very hard rock and it is used for building, and making any hard surfaces. Limestone is the most common rock on the surface on the earth although it is relatively soft it can be also used for building. It porous and may contain a lot of water. Amethyst is a purple mineral which belongs to a group of semi-precious gems. Quartz is the most common mineral on our planet, and it is has been used in many different branches of industry. Diamond, as I have said before,a diamond is a mineral which is one of the hardest, the rarest, and the most precious substances on Earth.