Please download the following file and complete the assignment. Instructions are given inside the file. Lab_06-Igneous Rocks and volcanism I.rtf

Lab Exercise: Identification of Igneous Rocks

The identification and classification of igneous rocks is based on texture and mineralogical

composition. Color is also useful because it is a reflection of the mineralogical composition,

but, if you can see the grain, you may also be able identify the mineral based on cleavage or

a crystal form characteristic of a component mineral. Please see Igneous_Rock_Textures_Photo_Guide.pdf [ find it under introduction in Canvas]

Instructions and Observations

Step 1: Retrieve the bag labeled Lab #6 Igneous Rock Samples from your lab kit and place the specimens (numbered 1 through 10) on a white sheet of paper. Further you have to fill up the charts to with your observations.

To get you started, a few hints will be provided for Rock 1.

Step 2: Find the textures of all the rocks samples. In the first column, describe in your own words the texture of each rock, whether it has minerals big enough to see, whether it has holes, etc. In the second column assign the corresponding igneous texture term to each rock.

(10 points)

Step 2: In the first column, describe in your own words the overall color of each rock. In the second column assign the corresponding igneous composition to each rock.

(10 points)

Step 3: Determine the identity of each rock, then write its name in the proper cell of the following table. Note that not every cell will be filled. The flow chart in

Figure 6.13 will help you narrow down the possibilities.

(5 points)

Lesson 6/ Igneous Rocks and volcanism