Question:
Identify the common metamorphic minerals labelled X and Y in the ACF diagram.
Identify the common metamorphic minerals labelled X and Y in the ACF diagram.
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In the ACF diagram, Grossular and Diopside are common minerals that are formed by the combination of calcium (C), alumina (A), and iron (F).
Updated On: Dec 4, 2025
- X – Anorthite; Y – Actinolite
- X – Grossular; Y – Diopside
- X – Wollastonite; Y – Almandine
- X – Ferrosilite; Y – Andradite
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The Correct Option is B
Solution and Explanation
The ACF diagram is used to represent the mineral composition in metamorphic rocks, particularly focusing on the alumina (A), calcium (C), and iron (F) components. The minerals in the diagram are formed from different proportions of these components.
- Grossular is a calcium-aluminum garnet mineral that forms in the ACF diagram and is located along the calcium side.
- Diopside is a calcium pyroxene mineral that also forms in the ACF diagram, located along the calcium axis but has more iron content than grossular.
Looking at the diagram, the point labelled X corresponds to Grossular and the point labelled Y corresponds to Diopside.
Thus, the correct answer is (B) X – Grossular; Y – Diopside.
- Grossular is a calcium-aluminum garnet mineral that forms in the ACF diagram and is located along the calcium side.
- Diopside is a calcium pyroxene mineral that also forms in the ACF diagram, located along the calcium axis but has more iron content than grossular.
Looking at the diagram, the point labelled X corresponds to Grossular and the point labelled Y corresponds to Diopside.
Thus, the correct answer is (B) X – Grossular; Y – Diopside.
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