EXERCISES Sedimentary Rocks Exercises PRE-LAB EXERCISES Answer these questions b

Question

EXERCISES Sedimentary Rocks Exercises PRE-LAB EXERCISES Answer these questions before looking at the sedimentary rock specimens to that you have mastered the material in the lab. be sure 1. Which of the following are terrigenous sedimentary rocks? I Draw a circle around them. Black shale Diatomite Oolitic Arkose Rock gypsum Red sandstone Chert Intraclastic limestone Quartz conglomerate Lignite Bituminous coal limestone Graywacke 2. There are three white, fine-grained sedimentary rocks. What distinguishing characteristics might you use to tell them apart? Chalk Kaolin 3. What is the main difference between shale and claystone? 4·For each of the rock types in the table below, give the name of the dominant mineral, the chemical formula of that mineral, and tell whether or not the mineral or rock) will effervesce (fizz) in hydrochloric acid. Mineral Name Chemical Formula Reaction to HCI Rock Type Limestone Dolostone Rock gypsum Rock salt Chert Travertine Sedimentary

Explanation / Answer

Q.1.Terrigenous sedimentary rocks:Black shale, Arkose, Rock Gypsum, Quartz conglomerate, Lignite, Red sandstone, Bituminous Coal, Chert, Graywacke

2. Chalk= It is made up of calcium carbonate, so it reacts with HCL and produces Carbon dioxide.

Kaolin= This is the only member of this series which is a mineral rather being a rock itself. This mineral is a form of clay mineral, so, it includes some patches of brown in it.

Diatomite=Does not fizz coming in contact with the HCL.

3. The only difference between the shale and the Claystone is the presence of cleavage. Due to the well developed cleavages of the shale, they break in regular plate shaped pieces, whereas the Claystone breaks into blocky pieces.

4. Mineral name Formula Does it Fizz?

Limestone--------Calcite and aragonite CaCo3 yes

Dolostone--------Dolomite   CaMg(CO3)2 yes

Rock Gypsum--Gypsum   CaSO4·2H2O no

Rock Salt--------Halite NaCl no

Chert-------------Quartz   SiO2 no

Travertine------Calcite CaCo3 yes

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