KIC004437 - Geol 4320 Lab 3 Part 2 — Exsolntion Zonation...

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Unformatted text preview: Geol 4320 Lab 3 Part 2 — Exsolntion, Zonation, and Replacement Objectives: This lab is designed to introduce you to aspects of minerals that represent non—equilibrim. Zonation occurs when a chemical conditions change during growth of a mineral. Exsolution generally occurs during cooling. Replacement occurs when a more stable mineral overgrows a less stable primary mineral. Directions: There are two thin sections that show each of these features. For every thin section listed you will sketch and describe what you see in the microscope. Also look up the term in a geologic dictionary or textbook and compare it to what you see. Be sure to include the sampie number, objective power used, and light configuration for each sketch. Also include any other optical properties you observe in your sketches. 1) Enolution ’ A1—7 and A4—2 contain K-feldspars that have undergone exsolution. Sketch a K—feldspar gram showing this for each section. What is the name given to this texture? ...
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