Gypsum Essays

INTRODUCTION Gypsum is scientifically named calcium sulfate dehydrate with the formula (CaSO4.2H2O). It is known to be a white powdery substance that is a naturally occurring mineral. The main form of calcium sulfate dehydrate used in dentistry is named calcium sulfate hemihydrate with the formula (CaSO4)2.H2O. Gypsum is mainly used for dental restorations and applications to replicate the patients’ oral cavity. Dies and models are created using the 5 gypsum products; impression plaster (Type 1)

and contains many of the largest natural gypsum crystals in the world (2). These pillars of selenite gypsum measure up to 50 feet long and 4 feet in diameter (1). These crystals were able to form in such huge quantities because the area was submerged in water that was rich in minerals as well as having a high stable temperature of 136 degrees Fahrenheit (2). The water had an abundant amount of anhydrite and, because of this environment, it dissolved into gypsum and formed these massive crystals (2)

Jewel Cave is located in the Black Hills of South Dakota. The Black Hills were formed during the Tertiary Lamanide Oroginy. (See Figure 2 and 7). The Black Hills are doubly asymmetrical anticlines that are plunging to form a dome. Two rock types are from the Tertiary and the Quaternary period and are starting to intrude into the older rock types. The outer laying rocks are dipping away from the center at an angle with a slope dipping 5 degrees. Jewel Cave’s rock type was formed in the Pennsylvanian-Permian

my mother Janethin Herrera, both born and raised in New Mexico, but they didn’t finished high school and so we moved to different places to places until my dad gotten a perfect job with the pay very well that we moved and stayed in a small town in Gypsum Colorado, where I spent my youth for only about fifteen years until we moved to New Mexico on the year 2014. From that time I have lived in Colorado, I did not know of my origins, what to do in the future, and constantly lose my self respect until

was to initially smooth an irregular rock surface with one or more of plaster layers. The first layer is the coarse, so called ‘arriccio’, applied directly to the wall. This layer consists of siliceous aggregates, and the matrix binder is mainly of gypsum or lime. The second intermediate layer is the fine plaster called ‘intonaco’,

Yelda Khorsabad Court, who is a Human-Headed Winged Bull (Lamassu), a huge sculpture that makes you feel tiny compared to it. It is a Neo-Assyrian sculpture from 721-705 B.C. The material used to make this sculpture is gypsum alabaster. Before, it was located in Dur-Sharrukin, which is now called Khorsabad, Iraq. In 1929, the statue was relocated to Chicago. It was in the palace of Neo-Assyrian King Sargon II, which was 85m long, almost a football field size. Lamassu is 16 feet tall and weighs about

reactivity with water, pure calcium cannot be found in nature, except in some living organisms, where Ca2+ plays an essential role in cellular physiology. Large quantities of this metallic element are present in carbonate rocks, such as marble, limestone, gypsum

The ancient earthwork known as the Nazca Lines, located on the high desert plains of Peru, is the most unusual drawing in the world. Some lines are straight and geometrical, while there are also depictions of animals, plants, and humans. In the drawing, lines define the shape onto the landscape at such enormous scale that it can only be seen from the sky. In fact, the Nazca Lines were first discovered by overflying commercial aircraft. One of the most intriguing designs of Nazca is the one which

most abundant element by mass in the earths crust, most abundant dissolved ion in seawater and the most abundant element in the human body. Calcium is never found in its pure state but it can be found in a variety of minerals including limestone, gypsum, and fluorite. In order to obtain calcium in its pure state, it would need to go through the chemical process called electrolysis.

management as well. Moreover, Soil amendments, is another low impact development stratagy that is used to minimize impacts on soils by restoring infiltration. This can improve physical and biological characteristics . The amendments can range from lime, gypsum to mulch and top soil ( Sinnes & Manning 1979) . Rain barrels are aboveground water storage. They receive all of the runoff from a building’s roof. Rain barrels is an excellent low impact development and can be easily made to anyones home. It is

agent pozzolona, a special volcanic dust found in central Italy. Pozzolona created an exceptionally strong bond with the aggregate. In most parts of the Roman world, where similar volcanic powders could not be found, local materials such as lime or gypsum were used as binding agents. The Romans also developed the arch that has been admired by engineers, which has been

inexpensive (Thomas & Puleo, 2009). The ‘‘gypsum’’ or CS is a mineral consisting of calcium sulfate dehydrate (CaSO4.2H2O). It must be screened before use in medical practice for impurities such as silicates, lead, strontium, and other naturally occurring materials (Ricci, Alexander, Nadkarni, Hawkins, Turner, Rosenblum, Brezenoff, De Leonardis & Pecora, 2000). Calcium sulfate hemihydrate (CSH) or Plaster of Paris (POP) is resulted from heating gypsum to 110ºC in a process known as calcination

Firstly, among the three, only the Mesopotamian stele shown in the Figure One used the distinct material, gypsum alabaster, differing from the other two fine arts due to the lack of ceramic. However, though the Egyptian amulet of Ra and Minoan Snake Goddess all are made by faience, the Egyptian artist only used one uniform color aqua blue and glazed after molding

physical landscape around him to his emotions. At the end of the same entry, Cantu describes his morning view: “I watched as the landscape shifted under the winter light. Behind me, my mother placed her hand on my shoulder and pointed to a cloud of gypsum sand in the distance, impossibly small, swirling across the basin desert.” It is evident in these passages that Cantu is at the beginning stages of his job as a border patrol agent, and he still does not know what it means to be good at his job. The

The world is increasingly dependent upon energy. Energy powers everything from cars, electricity, to toys. Energy can be divided into two separate categories, nonrenewable energy and renewable energy. Nonrenewable energy is energy produced from nonrenewable resources like oil, coal, and natural gas. These resources are depleting; some sources believe that an energy crisis is to ensue. The energy crisis itself is in question as some scientist don’t believe it will happen and others believe it will

In the novel The Glass Castle by Jeannette Walls, Rex Walls is a very special type of character and he changes throughout the book and just becomes almost like a different person. Rex goes from this person that cares about his family and his kids and would do anything for them to this person that doesn't want to do anything to do with family and him just going to the bar and drinking his life away. 1 In the beginning of the book Rex is a protective person towards his family and especially Jennette

Jeannette Walls, homeless people are marginalized as uneducated, reckless and mentally unstable. Jeannette Walls shows that homeless people are marginalized as uneducated in The Glass Castle. “Dad would get a job as an electrician or engineer in a gypsum or copper mine. Mom liked to say that Dad could talk a blue streak, spinning tales of jobs he’d never had and college degrees he’d never earned” (Walls 19). For the most part, Jeannette’s dad, Rex Walls, was the money maker of the house. Wherever

Calcium is a chemical element, that has the symbol Ca. Its atomic number is 20. Calcium is an alkali-earth metal, which means it builds oxides, that react with water. It's natural state in solid. Calcium's melting point is 842°C, 1548°F, 1115 K and boiling point is 1484°C, 2703°F, 1757 K. Calcium is a silver-white soft metal, that reacts to halogens, water, and acid. This metal was first discovered by a man called Humphry Davy, in 1808 through the process of electrolysis while doing a mixture

Dominican Republic The Dominican Republic has a beautiful scenery and is a great destination for vacation. The Dominican Republic is located on the island of Hispaniola, along with Haiti to the west. The Atlantic Ocean is to the north and the Caribbean Sea is to the south of the Dominican Republic. “Hispaniola is formed by the peaks of two undersea mountain chains, one coming from Cuba, and the other from Jamaica.” (World Book Online Student | Dominican Republic). The Dominican Republic has a thrilling

The Roman Empire The use of concrete in Roman Architecture Introduction: Roma, Modern day Rome, was founded in 753 BC, by the first of the seven Roman Kings, Romulus. The Roman Empire was one of the most powerful civilizations in history. The Roman power was echoed in their buildings with large arches and vast interior spaces, which was possible through the use of concrete. The Romans became such a powerful civilization, firstly, because of its location, Italy, between other powerful civilizations