Abstract
Quantitative determinations of preferred orientation of opaque minerals have been made only in a few cases by measuring cleavage faces (galena,D. Schachner-Korn). In this paper several methods are investigated critically which are likely to allow the determination of pole figures of ore minerals in a reasonable time. In the first part the special difficulties are discussed which occur in measurements of preferred orientation with X-ray pole figure goniometers (reflection method byL. G. Schulz) when the specimen consists of more than one mineral, when the mineral investigated is coarse-grained, and when the specimen is small. A critical discussion of instrumental errors is included. This method can now also be applied to the determination of preferred orientation in rocks, ceramic materials, etc. In the second part optical methods are given which include the construction of pole figures from measurements of bireflection and polarization figures of uniaxial minerals in reflected light. Examples of pole figures of pyrrhotite, hematite, pyrite, sphalerite, and chromite are given.
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