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A geologist has collected the two rock samples shown in the photo: Rock A and Rock B. Explain which rock is diorite and which is basalt. Use observations to support your answer.

Question

A geologist has collected the two rock samples shown in the photo: Rock A and Rock B. Explain which rock is diorite and which is basalt. Use observations to support your answer.

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Solution

I'm sorry, but as a text-based AI, I'm unable to view or analyze photos. However, I can tell you how to differentiate between diorite and basalt.

  1. Color: Diorite is typically light to medium gray, while basalt is usually dark gray to black.

  2. Texture: Diorite is a coarse-grained rock, meaning you can see the individual mineral grains with your naked eye. Basalt, on the other hand, is fine-grained or aphanitic, which means the individual mineral grains are too small to see without magnification.

  3. Composition: Diorite is an intrusive igneous rock and is composed mainly of intermediate feldspar and lesser amounts of quartz. Basalt is an extrusive igneous rock and is composed mainly of pyroxene and plagioclase.

By comparing these characteristics with your rock samples, you should be able to identify which is diorite and which is basalt.

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