Andalusite Gem Guide and Properties Chart
Andalusite Gem Guide and Properties Chart
Aug 18, 2021
gemstones.com
Q3. Kyanite, andalusite, and sillimanite (Al2SiO5 polymorphs) are common index minerals in metapelites (meta shales). Using the data given below, calculate the stability relations and construct an Al2SiO5 phase diagram as a function of pressure and temperature. The following 2 equations are needed: ΔG = ΔH - TΔS and the Clausius-Clapeyron equation dP/dT = 4ΔS/ΔV.Data at 1 bar and 298K:ΔH = 7.52 kJ/moleΔS = 12.97 J/mole KΔV = 5.81 cm3/moleΔS = 3.21 J/mole KΔV = 3.77 cm3/moleΔS = -1.63
Q3. Kyanite, andalusite, and sillimanite (Al2SiO5 polymorphs) …
Feb 15, 2022
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