What is eutectic temperature in anorthite and diopside system?
When the temperature reaches the eutectic, diopside (finally) begins to crystallize along with the anorthite. The two crystallize together and the temperature will not drop below 1275 oC (the eutectic temperature) until all the liquid is gone.
At what temperature does anorthite crystallize?
1500oC.
Pure albite melts (or crystallizes) at 1118oC, and pure anorthite melts (or crystallizes) at 1500oC.
What is diopside and anorthite?
melting compounds anorthite and. diopside. • Congruently Melting Compound. – A compound which when heated melts. directly to a liquid of its own composition.
What temperature does anorthite melt?
However once diopside is gone only the phase anorthite remains which melts at 1553°C, a gap of 279°C. Obviously the energetics of melting for closed and open systems are quite different.
Where is the liquid phase in the phase diagram?
The green line divides the solid and liquid phases and represents melting (solid to liquid) and freezing (liquid to solid).
What are alpha and beta in a eutectic diagram?
The extent of the solid solubility region can be plotted onto the phase diagram and labelled appropriately. A solid solution of B in A (i.e. mostly A) is called alpha and a solid solution of A in B (i.e. mostly B) is called beta.
What type of rock is anorthite?
Anorthite is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl2Si2O8. Anorthite is found in mafic igneous rocks.
What is the streak of anorthite?
| Anorthite | |
|---|---|
| Mohs scale hardness | 6 |
| Luster | Vitreous |
| Streak | White |
| Diaphaneity | Transparent to translucent |
What is water system phase diagram?
The phase diagram for water system comprises : 1. Areas: Area BOC represents the solid (ice) phase, which is the thermodynamically most stable state under these conditions. Area AOC represents the liquid (water) phase in the system and similarly area AOB represents the gas (vapour) phase in the system.
What is the phase of water?
There are three phases of water that are studied in elementary school: solid, liquid, and gas. Water can be found in all three phases on Earth.