Animated pdfs showing optical properties of minerals john brady. The microscopic investigation of materials such as minerals, rocks, ores, technical and other synthetic. Guide to thin section microscopy mineralogical society of america. Gems and mineralsthe ultimate rock video1989 laserdisc hd encode duration. Kimberlite in thin section mineralogy, igneous, igneous rock. The identification of minerals, either in rock thin sections or individual mineral grains. Standard polished sections and polished thin sections are illustrated, and include some showing polishing faults and tarnishing. Mineralogical society of america ore microscopy and ore. Thin and polish section prepare from bulk samples and then study by using microscope ore microscope, reflective microscope, nuclear. Polished thin section, plane polarized light, oil 125. The identification of the opaque ore minerals in polished sections has made much progress. In the center is a finished section of another chip mounted in bakelite and polished. Ore microscopy compared to the transmitted light microscopy you have been using for thin section petrology, it can be somewhat more equivocal in. A thin section is made by grinding down a slice of rock which has been glued to a.
Give a systematic description of minerals in thin sections using transmitted light. Chromite is darkbrown to opaque at full thin section thickness. Even in coursegrained thinsection work, the mostcommon rockforming minerals, plagioclase feldspars, are typically zoned. This section focuses particularly on the types of ore minerals and the microscopic investigation of metalliferous materials. Optical mineralogy mickey gunter, university of idaho. Chromite is a spineltype mineral, like magnetite, and has an extensive solid solution in the magnetite composition direction. Introduction to ore mineralogy an ore is a naturally occurring rock or material composed of a mineral or minerals of economic value that can be extracted at a reasonable profit. The majority of the photomicrographs show the minerals in plane polarized light using low to medium power air lenses since these are the usual viewing conditions. Emphasis is placed on the basic skills required for the study of opaque minerals in polished section, and information in the text and appendices on the more common ore minerals and assemblages provides examples.
Crmgalrich chromites are realtively transparent, and can be darkbrown at full thin section thickness. Josh reeves the global reality channel recommended for you. Identification tables for common minerals in thin section john faithful, hunterian museum, university of glasgow. Crystals and gemstones geology too thin minerals rocks and minerals too skinny crystals minerals earth science bryn mawr college mineralogy minerals in thin section proc. Ore minerals in reflected light lakehead university.
A small chip on the left has been cut from the hand specimen on the right by the use of a dia mond. How the composition of minerals in a thin section can be determined. The first two chapters cover the design and operation of the ore microscope and the preparation of polished and polished thin sections. How the composition of minerals in a thin section can be.
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