By J. Thomas Dutro Jr., Richard Vincent Dietrich, Richard M. Foose
One of many best-kept secrets and techniques in geology is that this convenient compilation of geological details. even if pocket-sized, this spiral-bound and easy-to-read ebook deals an excessive amount of helpful info equivalent to geologic map symbols, actual standards graphs and charts, projection nets, checklists, and data on approximately a hundred themes. excellent for speedy reference within the box, lab, and workplace.
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Additional info for AGI Data Sheets: For Geology in the Field Laboratory and Office
Also high grade metamorphic rocks. Fe-rich varieties found in metamorphic iron formations. Commonly associated with clinopyroxene. 4 Prismatic habit and cleavage at - 56° and 124°; dark color ; crystals elongate. sometimes fibrous Augite has similar colors but different cleavage angles. Other amphiboles, especially actinolite, may resemble hornblende. Igneous and metamorphic rocks. Widely distributed. ); green color Hornblende is usually darker colored. Metamorphic rocks; characteristic of greenschist facies metamorphism.
Filled with minerals deposited by. lor example, ground water or hydrothermal solutions - and now are veins. In the field, the strikes and dips of joints are usually recorded. For reports, the orientations of joints are often shown on maps and/or diagrams. , there has been displacement of the blocks parallel to the fracture. Although some fault zones have essentially vertical or horizontal dips, most do not. Figures 1 and 2 illustrate typical fault orientations. For example, based on the relative movements of their two blocks, normal faults (Figure 2A) are those whose hanging-walt blocks have moved downward with respect to their footwall blocks.
John Wiley and Sons, New York, 596 p. I. DARK COLORED A. 8. Crystal System )> Color Luster Hardness Specific Gravity c Diagnostic Features Similar Species Micaceous cleavage; dark color; elastic folia Phlogopite is general· ly lighter colored; chlorite is inelastic Micaceous cleavage, green color; inelastic folia Biotite is elastic Metamorphic rocks (diagnostic mineral of greenschist facies); igneous as alteration product. Pistachio green color; one perfect cleavage Complete series between epidote (AI: Fe +3 2:1) and clinozoisite (3:0), which is lighter colored Metamorphic rocks (found commonly with actinolite, albite, and chlorite in greenschists); igneous as alteration product.