Mineral Identification Prep for Exam 1 MNE 210 PDF
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This document provides a preparation guide for a mineral identification exam. It covers concepts such as cleavage, fracture, and crystal habits. The material appears to be for an undergraduate-level course in mineralogy.
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# MNE 210: Mineral Identification Prep for Exam 1 ## Cleavage vs. Fracture - **Cleavage:** The ordered breakage of a mineral along specific planes due to its weaker bonds. Think of it as a structured way of breaking. - **Fracture:** The unordered breaking of a mineral. Think of it as a demolition...
# MNE 210: Mineral Identification Prep for Exam 1 ## Cleavage vs. Fracture - **Cleavage:** The ordered breakage of a mineral along specific planes due to its weaker bonds. Think of it as a structured way of breaking. - **Fracture:** The unordered breaking of a mineral. Think of it as a demolition without any rhyme or reason. ## Cleavage Example - Calcite, when broken, exhibits 3 plans of cleavages, not at 90 degrees. [Video](https://youtu.be/IILYVygxQ00) ## Fracture Example - Quartz, when broken, exhibits no fracture, and instead fractures conchoidally. [Video](https://youtu.be/my-VY6Ux61F) ## Types of Cleavage | Number of Cleavage Directions | Sketch | Illustration of Cleavage Directions | Example | |---|---|---|---| | 1 | [Image of a sketch of a 1 direction cleavage] | [illustration] | Muscovite | | 2 at 90° | [Image of a sketch of a 2 direction cleavage at 90 degrees] | [illustration] | Feldspars | | 2 not at 90° | [Image of a sketch of a 2 direction cleavage not at 90 degrees] | [illustration] | Hornblende | | 3 at 90° | [Image of a sketch of a 3 direction cleavage at 90 degrees] | [illustration] | Halite | | 3 not at 90° | [Image of a sketch of a 3 direction cleavage not at 90 degrees] | [illustration] | Calcite | | 4 | [Image of a sketch of a 4 direction cleavage] | [illustration] | Fluorite | ## Visual Guide for Habits ### Crystal Habits (General Forms and Combinations) - Acicular (needles) - Tetrahedron (4 faces) - Twinned - Pyramidal - Cube (6 faces) - Bladed - Dipyramidal - Botryoidal - Tabular (shaped like a book) - Dipyramid prismatic - Rhombohedron (a leaning block with 6 faces, each a rhombus) - EQUANT - Dodecahedron (12 faces) - Pyritohedron (12 faces) - Dendritic - Prismatic - Radial - Fibrous - Scalenohedral ### Habit Examples **Dipyramidal Habit** - [Image of dipyramidal habit] **Cubic Habit** - [Image of cubic habit] **Bladed Habit** - [Image of bladed habit] **Tabular Habit** - [Image of tabular habit]
