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2) Following the recalculation procedure and examples given in Table 7.2 of your textbook, plot the following olivine compositions (given in oxide wt.%) on the Forsterite-Fayalite binary line below. Forsterite Mg2SiO4 Olivine compositions (wt.% oxides) Sample 1 2 3 SIO2 41.9 32.5 30.1 FeO* 2.1 53.2 69.4 MgO 56.2 13.3 1.0 Fayalite Fe2SiO4 2b) Do you notice a trend in the SiO₂ concentration (wt.%) as the olivine becomes more fayalite rich? If so, what is that trend? 2c) Calculate the MgO/(MgO + FeO*) wt.% ratio for all three olivine crystals.

2) Following the recalculation procedure and examples given in Table 7.2 of your textbook, plot the following olivine compositions (given in oxide wt.%) on the Forsterite-Fayalite binary line below. Forsterite Mg2SiO4 Olivine compositions (wt.% oxides) Sample 1 2 3 SIO2 41.9 32.5 30.1 FeO* 2.1 53.2 69.4 MgO 56.2 13.3 1.0 Fayalite Fe2SiO4 2b) Do you notice a trend in the SiO₂ concentration (wt.%) as the olivine becomes more fayalite rich? If so, what is that trend? 2c) Calculate the MgO/(MgO + FeO*) wt.% ratio for all three olivine crystals.

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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**Exercise 2** **2a)** Following the recalculation procedure and examples given in Table 7.2 of your textbook, plot the following olivine compositions (given in oxide wt.%) on the Forsterite-Fayalite binary line below. **Olivine compositions (wt.% oxides):** | Sample | SiO₂ | FeO* | MgO | |--------|------|------|------| | 1 | 41.9 | 2.1 | 56.2 | | 2 | 32.5 | 53.2 | 13.3 | | 3 | 30.1 | 69.4 | 1.0 | **Diagram Explanation:** This diagram is a binary line representing the range between Forsterite (Mg₂SiO₄) on the left and Fayalite (Fe₂SiO₄) on the right. Each olivine sample is to be plotted along this line based on its SiO₂, FeO*, and MgO compositions. **2b)** Do you notice a trend in the SiO₂ concentration (wt.%) as the olivine becomes more fayalite rich? If so, what is that trend? **2c)** Calculate the MgO/(MgO + FeO*) wt.% ratio for all three olivine crystals.
Transcribed Image Text:**Exercise 2** **2a)** Following the recalculation procedure and examples given in Table 7.2 of your textbook, plot the following olivine compositions (given in oxide wt.%) on the Forsterite-Fayalite binary line below. **Olivine compositions (wt.% oxides):** | Sample | SiO₂ | FeO* | MgO | |--------|------|------|------| | 1 | 41.9 | 2.1 | 56.2 | | 2 | 32.5 | 53.2 | 13.3 | | 3 | 30.1 | 69.4 | 1.0 | **Diagram Explanation:** This diagram is a binary line representing the range between Forsterite (Mg₂SiO₄) on the left and Fayalite (Fe₂SiO₄) on the right. Each olivine sample is to be plotted along this line based on its SiO₂, FeO*, and MgO compositions. **2b)** Do you notice a trend in the SiO₂ concentration (wt.%) as the olivine becomes more fayalite rich? If so, what is that trend? **2c)** Calculate the MgO/(MgO + FeO*) wt.% ratio for all three olivine crystals.
Expert Solution
Step 1: Introduction

The composition of samples 1,2 and 3 is given in the table. 

We have to plot this composition on the forsterite-fayalite diagram given in the question. 

First we have to calculate the percentage of MgO and then we have to plot the percentage on the diagram. 

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