Second Midterm, Fall 1998 (100 pts)
  1. (25 pts) Sketch a diagram showing the structure of the earth. Define the boundaries of each region by
    2. a. radius
    b. temperature and
    c. pressure
     Be sure to include the surface and the center of the earth in your answer.
  2. (25 pts) State the important phases for each of the regions of the earth (excluding the transition zone and the D¢ ¢layer). Include the
    3. a. name of the mineral,
    b. its chemical composition or formula, and
    c. its crystal system (cubic, hexagonal, amorphous, etc.)
  3. (10 pts) Identify the phases that correspond with the crystal structure drawings.

  4. (10 pts) What is the most common mineral in the
    5. a. core,
    b. lower mantle
    c. upper mantle
    d. crust?
  5. (15 pts) What are the 3 different K-spar phases and what crystallographic aspects distinguish them?
  6. (15 pts) Name the 2 different feldspar series and explain their mixing properties and solid solution behavior.