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Question: the thin section for this activity is from a rock...

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The thin section for this activity is from a rock recovered from nearly 3 miles below the surface of Florida. It contains the evaporite minerals gypsum and anhydrite. Both of these minerals are relatively rare, but are important in rocks that underlie the thick limestones under Florida. Both gypsum and anhydrite are anisotropic, but can be easily distinguished based on their birefringence: anhydrite has vivid birefringence and gypsum has gray birefringence. Which mineral, gypsum or anhydrite is more abundant in this rock?

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