A gemstone can also be known as precious or semi-precious stones. Precious stones include diamonds, emerald, ruby and sapphire, while the rest are qualified as semi-precious stones.
Gemstones are classified by their color, translucency and hardness. Gems can also come with mineral bases like diamonds or rubies and with organic bases like amber. Today, geologists use the chemical composition of a gemstone to classify it into groups, species and varieties.
The price of the gemstones depends on the rarity, color, composition, hardness and cut. Crystals are pure substances whose atoms, molecules, or ions are arranged in an ordered pattern, where they extend in all three spatial dimensions.
The process of crystal formation via mechanisms of crystal growth is called crystallization or solidification. Not all crystals need to be in solid formation, where water freezing also begins with small ice crystals that grow. Crystal symmetry requires that the unit cells stack perfectly with no gaps.
Gemstones are usually classified as semiprecious and precious stones. Some semiprecious gemstones include amethyst, garnet, citrine, turquoise, and opal. Precious gemstones include diamond, emerald, ruby, and sapphire. The scientific term for rocks is petrology, and understanding them is crucial for understanding the formation and mineral makeup of the earth. Rocks are made from minerals and can come in every size: They can be tiny pebbles or mountains big enough on which to climb or drive.
Rocks do not have a special chemical or mineral makeup. While most rocks are not cut or polished to be used as gemstones, some rocks, including lapis lazuli, are classified as gems. Minerals occur naturally within the earth's surface and are solid formations. They are defined by their shape and their crystalline makeup. They are formed when magma, which is molten rock, cools.
They can also be formed by water in caverns under the sea. Minerals are usually found between sediments or in areas that contain lava flows. There are more than 4, minerals that are formed naturally within the earth, and each one has a specific crystal structure. Minerals belong to one of 15 different chemical groups, and these represent the compounds they contain. Minerals have different distinct classifications. Some of these are color, luster, tenacity, hardness, and fracture.
Activation mail sent. Your activation mail has been sent. Please click the link to activate your account. Your account is not activated. Resend activation mail. Email Address. Remember me. Forgot password? Don't have an account yet? Register now. Reset password.
Your email address was not found. Password reset. An email containing a link to reset your password has been sent. Product added to your bag. Continue Shopping Checkout. What are Gemstones? Gemstones Types. Fancy Colored Diamonds. The 4Cs of Diamond Quality. The 4Cs: Color. The 4Cs: Clarity. The 4Cs: Cut.
The 4Cs: Carat. How To Choose a Diamond. How to Avoid Scams. About GIA. My Ring Size Guide. Ars Nobilis. Uranium is a highly radioactive element. It is used in cancer treatments, X-rays, military weapons and fuel for the space shuttle.
Vanadium is found in many foods and helps bones grow. It is useful in regulating blood sugar in diabetics and helps grow muscles for bodybuilders. It is used in wastewater cleanup and since it can absorb ammonia, it is used in kitty litter and reducing other animal smells. Zinc [image left] is essential for a healthy life. Zinc deficiency can cause rashes, diarrhea, impaired taste and eye problems. It is used to macular degeneration, diabetes and the common cold.
Some examples of minerals mined here in Ireland are: Gypsum Gypsum is an evaporite mineral and the most common Sulphate mineral in the world. It is used widely in the construction industry in the form of plasterboard and wet plaster. Gypsum Gypsum is a very soft mineral with a variety of uses, most commonly in drywall, also known as sheet rock.
It is also used as a fertilizer and road construction. It is mined in areas of Co. Copper Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is widely used in electronics industry especially for use in wires. Copper is a common metal throughout the world. It is used for currency, jewelry, plumbing and to conduct electricity. It is a soft, orange-red metal. Copper has previously been mined in Co. Lead and Zinc, and sometimes silver, are usually found occurring together.
Ireland has a long histroy of minig lead and zinc with some of the larges mine Europe recently operating here; Lisheen Mine Co.
Tipperary and Tara Mine Co. Meath and historically Silvermines Co. Precious metals are rare, naturally occurring metallic chemical elements of high economic value.
Chemically, they tend to be less reactive than most elements. They are usually ductile and have a high lustre. In history precious metals were important as currency but are now regarded mainly as investment and industrial commodities. The main examples of precious metals are Gold, Silver and Platinum. Some examples of precious metals found in Ireland are; 1. Gold Gold is a valuable, yellow metal.
Gold is usually found in metamorphic rock. It is found in underground veins of rock where the inside of the Earth heats the water that flows through the rock. Gold has been important all throughout history, it was used in important events by the ancient Egyptians and was important in Bronze Age Ireland. Due to both it beauty and its durability it is regularly used in jewellery and as a form of currency.
Trace amounts of gold are found almost everywhere, but large deposits are found in only a few locations. Platinum Platinum is a valuable grey-white metal. It is dense, malleable, ductile and highly unreactive metal. It has a wide variety of uses including use in catalytic converters, electrical contacts, dentistry equipment, and jewellery.
0コメント