Oxygen is the chemical element in the periodic table that has the symbol O and atomic number 8. The element is very common, found not only on Earth but throughout the universe, usually bound with other elements.
Oxygen: A nonmetallic element that is normally a colorless, odorless, tasteless gas that constitutes 28 percent of the Earth's atmosphere. Oxygen combines with many other elements easily.
oxygen - A colorless, odorless gaseous element, 0. Used with a fuel gas such as hydrogen, acetylene, propane, methane or coal gas to produce intense heat.
An oxygen atom has two electrons in its outermost shell that are available to bond with the silicon atom.
C10H16O (oxygenated hydrocarbon)
The movie Jurassic Park popularized the myth that someday we may be able to extract DNA from the entombed insects within, ...
Advent of bottled oxygen (liquefied and compressed)
Successful experiments with chemical manufacture of very small rubies and sapphires in Paris, published by Frémy
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This process causes a controlled oxidation of the metal's surface to occur (oxygen atoms bond to surface atoms of the metal). Aluminum is often anodized, as is magnesium, titanium, and tantalum.
The minerals of the oxide class are those which contain oxygen bonded to one or more metallic elements. Hydroxides are compounds of a metallic element and water or the hydroxyl anion (OH)-.
Heating a gem in the presence of oxygen can activate such color centers in corundum.
Capillary Loops The blood vessels feeding oxygen to the skin, starting in the skin's dermis, looping towards the epithelium and returning into the dermis.
2, oxygen 46.8. Its hardness is 9 in the scale, and no mineral except the diamond equals it in this respect. This hardness gives it a wearing quality as a gem second only to the diamond.
Bloodstone is said to strengthen and oxygenate the bloodstream, enhancing physical and mental vitality. It will strengthen the heart, spleen and bone marrow and aids in balancing iron deficiencies.
The local gem traders had learned to heat the brown zircons in an oxygen free environment to produce dazzling blue stones. To this day, the border area of Thailand and Cambodia remains the largest producer of gem quality zircons.
Since it a refractory in nature it can reacts with oxygen producing changes on the metal's surface .When a electric current is passed through the surface it forces oxygen to produce thick oxide layer and diffused white light produces stunning colors.
Silicates - Mineral containing silicon and oxygen, along with other elements.
Skarn - A contact metamorphic rock, often containing well-formed crystals of silicate and other minerals.
Amethyst is found in cavities of rock where molten materials rich in silicon and oxygen from deep inside the earth have surfaced and cooled. The faster molten material cools, the smaller the resulting crystals that form will be.
Gold has no oxides and is not affected by oxygen in the atmosphere as are other metals. This is why gold does not tarnish -- tarnish is the result of metal reacting with oxygen in a process called oxidation.
A "reducing" atmosphere (one without oxygen) which can either be supplied via a high tech furnace, or simply by placing the gems to be treated in a closed container with charcoal), causes the number to go down (+3 to +2 for example).
Carbon dioxide, oxygen and moisture in the air react chemically with the iron to produce the familiar red-brown coating that eventually causes the metal to crumble away.
Tungsten Carbide is created by firing tungsten with carbon powder in an oxygen-free oven at 6,200oF. This process is called sintering, and it creates the hardest metal used in making jewelry.
Most lampwork artists use a bead making torch that burns either propane or natural gas for the fuel, surface mixed with air or pure oxygen (either from a tank or a lampwork oxygen concentrator) as the oxidiser.
Rock crystal quartz, the most common gem variety of quartz crystal, is, like all quartz, formed from the two most abundant elements in the earth's crust: silicon and oxygen.
A compound of two parts aluminum and three parts oxygen which occurs naturally as corundum. Alumina is the base of aluminous salts, a constituent of feldspars, micas, etc.
Formed from the two most abundant elements in the earth's crust: silicon and oxygen. Quartz has a high thermo-conductivity, which makes it feel cool to the touch.
Oxidation is a chemical process in which oxygen atoms bond to atoms of a material (like a metal) and electrons are transferred from the oxided material to the reduced material. Iron oxidizes when exposed to air and moisture, forming iron oxide (rust).
For an instance, a crystal of quartz is in hexagonal shape because of the manner the atoms of silicon and oxygen combine together. Generally, there are 2,000 minerals have been discovered. Oxygen is a component of several minerals.
Overview: Magnesite is composed of magnesium, carbon, and oxygen (MgCO3) and was named after its chemical composition. Magnesite is commonly found in white or gray and sometimes tinted yellow or brown.
In addition to zirconium, silicon and oxygen, zircon contains small quantities of rare earths and radioactive elements such as thorium and uranium. These inclusions give zircon differents hardnesses and properties.
On the mental/emotional levels, when sufficient oxygen is going to the brain (which requires large amounts) we feel alert, energized, clear, able to concentrate, and emotionally balanced.
All these metals require oxygen to be mixed with the fuel when melting since they have such a high melting point. They resist tarnishing and do not require flux when soldering.
The metals are fused together in an oxygen free furnace at very high temperatures. Even at such high temperatures, the tungsten itself does not melt to mix with the other metals.
Oxidation - Chemical process to blacken or tarnish. Slphur and oxygen is used on silver.
Oxide - A compound containing one oxygen atom per molecule.
Oxidize - The act of combining with oxygen molecules to make an oxide. Oxidized metal is rusted.
The resulting boules are opaque black, but when reheated in a stream of oxygen they change to various colours.
See also: Color, Mineral, Rough, Crystal, Metal