ABSTRACT
The microscope (Fig. 2.1) used for the study of ‘ore’ or ‘opaque’ minerals is basically the same as a petrological microscope except that it uses reflected light. (It should not be assumed, however, that experience with the petrological microscope can be directly transferred to the use of the reflected-light microscope.) Some modern microscopes (Fig. 2.2) may be dual purpose and have a combination of both transmitted and reflected light sources built into their assembly. These are capable of examining polished samples, petrological thin sections and polished thin sections. They are particularly useful when both the opaque and nonopaque minerals have to be examined for their mutual relationships and textures, e.g. ore minerals together with gangue or the host/wallrock minerals. Reflected/incident light (ore) microscopes. (i) Leitz ‘Laborlux 12ME'. Reproduced by courtesy of Ernst Leitz Wetzlar GmbH. (ii) Union ‘Unimet' inverted stage microscope with binocular head. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315841205/5ba85c6a-c650-48a2-85ad-93c3c6d81204/content/fig2_1_B.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/> Reproduced by courtesy of Vickers Instruments Ltd. Dual-purpose microscopes capable of viewing samples in transmitted as well as reflected/incident light. (i) ‘MP3500' James Swift Polarising Microscope with trinocular head. https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315841205/5ba85c6a-c650-48a2-85ad-93c3c6d81204/content/fig2_2_B.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/> Reproduced by courtesy of Prior Scientific Instruments Ltd. (ii) Leitz ‘Metallux II' microscope. Reproduced by courtesy of Ernst Leitz Wetzlar GmbH.
