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Vaibhav Singh posted an Question
August 26, 2021 • 01:32 am
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30 points
30 points
- IIT JAM
- Geology (GG)
Q. select sequence of the minerals according to increasing melting point: a quartz, forstente, fayalite b. homblende, fayalite, forsterite c fayalite, forsterit
A7 Select sequence of the minerals according to increasing melting point: A Quartz, Forstente, Fayalite B. Homblende, Fayalite, Forsterite C Fayalite, Forsterite, Diopside p Forsterite, Fayalite, Quartz (PU-2011)
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Vaibhav singh
Cam I be asked asked about Melting temperature order in other endmembers of solid soln minerals like..Enstatite,Ferrosilite ?? or like Diopside ,Hedenbergite?? Or polymorphs like Kyanite ,siolimanite ,andalusite(polymorphs) ...?
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Saurabh 1 Best Answer
Specifically for this question Or whenever you encounter questions like these, refer Bowen's reaction series that indicates the temperatures at which minerals melt. Whenever a rock undergoes melting, the first mineral that we usually get as a melt is quartz Or quartz will melt first and olivine is the last mineral to melt (at some higher temperature). In increasing order of melting, the series can be depicted as-- high temperature - olivine, pyroxene and Ca-rich plagioclase; intermediate temperature - amphibole, biotite and Na-rich plagiolase; and low temperature - muscovite, alkali feldspar and quartz. You can clearly observe the sequence pertaining to the increasing melting point or the temperature they will form melt first and end up with melting of last mineral. Note that: Alkali feldspar and Quartz are not included in any of the discontinuous and continuous series of Bowen's. While talking about Forsterite and fayalite then n forsterite has superior properties, namely chemical stability at high temperatures eland electrical properties . So melting point of Forsterite is higher than fayalite. So correct order is -- Horneblende-Fayalite–Forsterite.
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Vaibhav singh
I knew this elementary order by Bowen Rxn series but I haven't seen Forsterite ,fayalite in Bowens rxn series till now!