What property is diamond scratching glass?
A piece of glass is scratched with a diamond-tipped stylus, showing that diamond is harder than glass. Discussion: The hardness of a substance depends on the nature and strength of the bonds that bind the atoms, molecules or ions in a crystal lattice.
What are the properties of diamond?
Besides the hardness, diamond provides an impressive combination of chemical, physical and mechanical properties:
- Hardness.
- Low coefficient of friction.
- High thermal conductivity.
- High electrical resistivity.
- Low thermal expansion coefficient.
- High strength.
- Broad optical transparency from ultra violet to infra red.
What is the composition of volcanic glass?
volcanic glass, any glassy rock formed from lava or magma that has a chemical composition close to that of granite (quartz plus alkali feldspar). Such molten material may reach very low temperatures without crystallizing, but its viscosity may become very high.
Do all kimberlites contain diamonds?
Kimberlite pipes: Where they are located Kimberlite pipes were first found near Kimberley in South Africa, but since then they have been found on most continents. Of course, as has been noted, not all kimberlite pipes are created equal and only a small percentage of them contain diamonds.
Is diamond an insulator?
Diamond normally has a very wide bandgap of 5.6 electron volts, meaning that it is a strong electrical insulator that electrons do not move through readily.
What are the physical properties of diamond and graphite?
| Diamond | Graphite |
|---|---|
| It has crystalline nature | It has layered structure |
| Each C is sp3 hybridzed and forms 4 covalent bonds with neighboring C atoms. | Each C atom is sp2 hybridized and forms 3 sigma bonds with 3 other C atoms. Fourth electron forms pi bond. |
| The geometry is tetrahedral. | The geometry is planar |
What are two physical properties of diamond?
Physical Properties of Diamond
- has a very high melting point (almost 4000°C). Very strong carbon-carbon covalent bonds have to be broken throughout the structure before melting occurs.
- is very hard.
- doesn’t conduct electricity.
- is insoluble in water and organic solvents.
What is the structure and properties of diamond?
Diamond has a giant covalent structure in which: each carbon atom is joined to four other carbon atoms by covalent bonds. the carbon atoms have a regular lattice arrangement. there are no free electrons.
How do you identify volcanic glass?
Volcanic glasses are commonly dark or black, although these structures can also be brown, tan, green even blue, red, orange, or yellow depending on the trace elements or inclusions [2]. Like any crystal, volcanic glasses are chemically metastable, that is, with the passage of time, the volcanic glasses can crystallize.
What is volcanic glass called?
Obsidian
Obsidian is an igneous rock occurring as a natural glass that is formed by the rapid cooling of viscous lava from volcanoes.
What rock contains diamonds?
kimberlite
kimberlite, also called blue ground, a dark-coloured, heavy, often altered and brecciated (fragmented), intrusive igneous rock that contains diamonds in its rock matrix.
Do all volcanoes produce diamonds?
The answer lies in rare and unusual volcanoes called kimberlites. These deeply-seated volcanic eruptions can sometimes pick up diamonds, along with other minerals and rock fragments, and blast them to the top. Think of kimberlites as elevators that diamonds use to ride up to Earth’s surface!