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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Geology (GG)
Which of the following is high temperature low pressure variety of alumino silicate
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Sajan sarthak
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Al2SiO5 - has three polymorphs. The high pressure form is kyanite (Triclinic), the high temperature form is sillimanite (orthorhombic), and the low temperature, low pressure form is andalusite (orthorhombic). Transformations between all three polymorphs are reconstructive, thus all three forms can metastably exist at the Earth's surface. Transformation rates are somewhat faster, however, at higher temperatures in the Earth.
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Rahul kumar Best Answer
Sillimanite- High temperature Low pressure aluminosilicate Andalusite- Low temperature Low pressure aluminosilicate Kyanite- Low temperature High pressure aluminosilicate See the diagram below for details.