1. 2. 3. 4. Choose the description that closely matches the rock type, also what
ID: 291223 • Letter: 1
Question
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Choose the description that closely matches the rock type, also what is the name of the rock?
his is a dark gra to black, inely crystal ne volcanic rock that contains holes and compose otmale mu eral Calcium-nch plazi clase, and so meou ?? O This is a coarse-grained rock that is composed of angular fragments in a fine-grained matrix. The matrix can be sandy or muddy, as in a debris flow O This is a light gray to tan rock that reacts to acid and has interlocking crystals This sample is dark green, brown to black, and has a nonmetallic luster. The hardness is 2.5 to 4 and the streak is white to gray. This is a metamorphic rock that is primarily composed of calcite or dolomite. This is a dark gray to black, finely-crystalline volcanic rock that contains no holes and is primarily composed of mafic minerals, calcium-rich plagioclase, mafic minerals, and some olivineExplanation / Answer
1. This is dark grey to black, finely crystalline volcanic rock that contains holes, and is composed of magic minerals, calcium rich plagioclase and some olivine. The rock is diorite.
2. This is a finely crystalline volcanic rock that is black to dark gray and contains no holes, and is composed of calcium rich plagioclase, mafic minerals and olivine.
3. Basalt is dark coloured, fine grained igneous rock that comprises of plagioclase and pyroxene . The answer is basalt.
4. This is a light gray to tan sedimentary rock that reacts to acid and has interlocking crystals. It contains carbonate and thus reacts to acid.
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