- Where do we get graphite from?
- How is graphite formed in nature?
- Where does the graphite in pencils come from?
- Why is graphite dangerous?
- Why is graphite slippery?
- Does graphite cause cancer?
- What is graphite made of?
- Can graphite kill you?
- Where is graphite most commonly found?
- What mineral is graphite?
- How strong is graphite?
- Does pencil lead cause cancer?
Where do we get graphite from?
It also occurs in igneous rocks and in meteorites.
Minerals associated with graphite include quartz, calcite, micas and tourmaline.
The principal export sources of mined graphite are in order of tonnage: China, Mexico, Canada, Brazil, and Madagascar.
In meteorites, graphite occurs with troilite and silicate minerals..
How is graphite formed in nature?
Graphite most often occurs in metamorphic rocks formed from regional metamorphism or contact metamorphism of organic-rich sedimentary rocks, such as organic-rich marble, quartzite, schist, gneiss, and metamorphosed coal. … As mentioned, graphite forms from the alteration of organic material during metamorphism.
Where does the graphite in pencils come from?
Pencil lead does not come from lead. In fact, even though it’s greasy and black and soft like lead, it is actually a carbon material called graphite. Graphite is mined as flakes or lumps and ground together with clay, then baked into the little sticks you see encased in wood or inside mechanical pencils.
Why is graphite dangerous?
There have been two major accidents in graphite-moderated reactors, the Windscale fire and the Chernobyl disaster. In the Windscale fire, an untested annealing process for the graphite was used, causing overheating in unmonitored areas of the core and leading directly to the ignition of the fire.
Why is graphite slippery?
The delocalised electrons are free to move through the structure, so graphite can conduct electricity. … The layers in graphite can slide over each other because the forces between them are weak. This makes graphite slippery, so it is useful as a lubricant .
Does graphite cause cancer?
Graphite alone may cause irritation of the respiratory tract but is not listed as a carcinogen. However, it may contain impurities of crystalline silica which is listed as a carcinogen. Inhalation of dust over prolonged periods of time may cause pneumoconiosis.
What is graphite made of?
Both diamond and graphite are made entirely out of carbon, as is the more recently discovered buckminsterfullerene (a discrete soccer-ball-shaped molecule containing carbon 60 atoms). The way the carbon atoms are arranged in space, however, is different for the three materials, making them allotropes of carbon.
Can graphite kill you?
There is no risk of lead poisoning if you stab yourself (or someone else) with a pencil because it contains no lead — just a mixture of clay and graphite. Still, pencil wounds carry a risk of infection for the stabees, lawsuits for stabbers. 2.
Where is graphite most commonly found?
ChinaWhere is Graphite Sourced. China is the largest exporter producing 75-80% of the world’s graphite. There are numerous other countries including Canada, India, Brazil, Sri Lanka and North Korea.
What mineral is graphite?
Pure graphite is a mineral form of the element carbon (element #6, symbol C). It forms as veins and disseminations in metamorphic rocks as the result of the metamorphism of organic material included in limestone deposits.
How strong is graphite?
Extensive research over hundreds of years has proved that graphite is an impressive mineral showing a number of outstanding and superlative properties including its ability to conduct electricity and heat well, having the highest natural stiffness and strength even in temperatures exceeding 3600 degrees Celsius, and it …
Does pencil lead cause cancer?
These pigments are chemicals that are generally considered non-toxic in pencil amounts. Colored pencils might stain the mouth or skin, but that is harmless and will wear off by itself. If a person is stabbed by a pencil a piece of lead can break off under the skin.