Daily Objectives

Department of Earth Science |Northeastern Illinois University

INTRODUCTION TO EARTH SCIENCE
ESCI 121
Section 05
Spring 2009
Daily Objectives #10 (February 19, 2009)                                                                                                         Dr. Sanders

By the end of today's class, you should be able to do the following:

w   Review: List and explain the mineral properties most commonly used to describe/identify minerals:

        ▫ hardness        ▫ luster            ▫ color                 ▫ cleavage         ▫ specific gravity (density)
        ▫ streak             ▫ taste             ▫ magnetism      ▫ reaction with acid (effervescence or odor)

New this time

Minerals

w   Explore and describe the reaction of minerals to acid.

w   Name the two minerals that effervesce with acid, and explain how to tell them apart.

Sedimentary Rocks

w   Explain how sedimentary rocks form.

w   List three clastic (detrital) sediments, and explain how to identify them.

w   List 5 chemical sediments.

w   Fill in the empty boxes:

CLASTIC SEDIMENTARY ROCKS	SEDIMENT NAME AND SIZE OF GRAINS	ROCK NAME	HOW WILL YOU RECOGNIZE IT WHEN YOU SEE IT AGAIN?
	Gravel, bigger than 2 mm
		Sandstone
	Clay or silt, grains so small they are not visible to the unaided eye		Flat shape, thin layers
CHEMICAL SEDIMENTARY ROCKS	MINERAL MAKING UP THE ROCK	ROCK NAME	HOW WILL YOU RECOGNIZE IT WHEN YOU SEE IT AGAIN?
	Calcite
		Dolostone, rock dolomite, or just dolomite	Fizzes only when powdered, some samples have pinpoint sized holes
	Gypsum
		Rock salt

w   Define the following terms and explain their significance to sedimentary rock-forming processes:

     ▫ lithification           ▫ cementation                ▫ chemical sediments ▫ clastic (detrital) sediments
      ▫ compaction         ▫ chemical sedimentary rock      ▫ clastic (detrital) sedimentary rock

w   Using the results of our "Rock Your State!" investigations, describe how sedimentary rocks are classified.

Department of Earth Science | Northeastern Illinois University