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A geologist finds a layer of rock that is made of coarse-grained foliated particles arranged into bands and splits into sheets when struck with a hammer.


What type of rock did the geologist find?


A.

marble


B.

gneiss


C.

quartzite


D.

slate

Verified Answer :

MissPhiladelphia

A geologist finds a layer of rock that is made of coarse-grained foliated particles arranged into bands and splits into sheets when struck with a hammer. The type of rock did the geologist find is slate. The answer is letter D.

Answer:

Option (B)

Explanation:

Gneiss is a metamorphic rock which forms due to the extremely high pressure and temperature condition. It is characterized by the coarse and medium-sized grains and there is the presence of alternating dark and light-colored bands on it. The light color band contains felsic minerals such as feldspar, quartz and the dark band contains mafic minerals such as biotite, hornblende, garnet. It is a very high-grade metamorphic rock. These characteristics helps in identifying a gneissic rock.

Thus, the geologist found a gneissic rock.

Hence, the correct answer is option (B).

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