- Geology.com (https://geology.com/rocks/) as a reference.
- Rock pictures available in in the Google folder “Pictures for Rocks Lab”
Part 1 - Igneous Rocks
1. The texture of igneous rock is typically described as phaneritic, aphanitic, glassy, or vesicular. Briefly describe what each of these textures means, and how it relates to the rate of cooling to form the rock.
Rate of Cooling
2. Using the website and your lecture notes, state the texture for each of the following rocks.
3. The composition of igneous rock is typically described as felsic, intermediate, mafic, or ultramafic. The composition of the igneous rock is determined by the minerals that are in the magma or lava that forms the rock. State the type of color that is found in igneous rocks of each type of composition. (Choose from light, dark, dark greenish, and in between light and dark.)
4. Using the website and your notes, state the composition (felsic, intermediate, mafic, ultramafic) for each of the following rocks.
5. Complete the following table to identify the pictures of igneous rocks.
Texture: phaneritic, aphanitic, glassy, or vesicular
Composition: felsic, intermediate, mafic, or ultramafic
Igneous Rock Name: Basalt, granite, etc.
Igneous Rock Name
Part 2 - Sedimentary Rocks
1. Sedimentary rocks are classified by the materials that most directly make up the rock. Briefly describe the three basic types of composition for sedimentary rocks.
2. Using the website and your lecture notes, state the composition of each of the following types of rocks.
3. Carbonate minerals, such as calcite (CaCO3) will undergo a chemical reaction with HCl to create CO2, which is a gas at room temperature. Therefore, when HCl is applied to these minerals, they will bubble or fizz. Considering which carbonates we have discussed, and which sedimentary rocks are made of these minerals, complete the chart below with which rocks you would expect to produce bubbles when you apply HCl.
Produce bubbling when HCl is applied?
4. Complete the following table to identify the pictures of sedimentary rocks.
Composition: clastic, chemical, or organic
Mineral Composition (for chemical sedimentary rocks only!): state dominante mineral present
Reaction with HCl: if reaction with HCl is expected, based on chemical composition
Sedimentary Rock Name: sandstone, bituminous coal, etc.
Reaction with HCl
Sedimentary Rock Name
Part 3 - Metamorphic Rocks
1. Describe the difference between a foliated and nonfoliated metamorphic rock.
2. Using the website and your lecture notes, identify each of the following rocks as foliated or nonfoliated.
Foliated or Nonfoliated
3. Metamorphic rocks are formed when a previously existing rock undergoes metamorphism (heat and pressure). The parent rock is this previously existing rock. For each of the metamorphic rocks in the table, state the parent rock(s).
4. Recall that carbonate minerals will undergo a chemical reaction with HCl to create CO2, which is a gas at room temperature. Therefore, when HCl is applied to these minerals, they will bubble or fizz. Considering the parent rocks of the metamorphic rocks listed below, state which you would expect to produce a reaction with HCl.
Reaction with HCl?
5. Complete the following table to identify the pictures of the sedimentary rocks.
Foliated or nonfoliated: showing layer of minerals or not
Reaction with HCl: is reaction with HCl is expected
Parent Rock: non-metamorphic rock that is turned into metamorphic rock
Metamorphic Rock Name: gneiss, marble, etc.
Foliated or Nonfoliated?
Reaction with HCl
Metamorphic Rock Name
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