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Template: Mineral identification. ... Download as PDF; Printable version; ... Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; ...
Most commonly, rock and mineral samples are prepared as thin sections or grain mounts for study in the laboratory with a petrographic microscope. Optical mineralogy is used to identify the mineralogical composition of geological materials in order to help reveal their origin and evolution. Some of the properties and techniques used include:
The stage of the microscope should be rotated until maximum colour is found, and therefore, the maximum birefringence. Each mineral, depending on the orientation, may not exhibit the maximum birefringence. It is important to sample a number of similar minerals in order to get the best value of birefringence.
When placed between two polarizing filters set at right angles to each other, the optical properties of the minerals in the thin section alter the colour and intensity of the light as seen by the viewer. As different minerals have different optical properties, most rock forming minerals can be easily identified.
Degrees which mineral turns black in XPL in microscope. Zoning; Mineral zoning present. Mineral texture; Porphyritic (large xenocryst surrounded by fine crystals), Melange (mix of minerals), Poikilitic (one mineral grown around another), Polymorph (same composition but different shape), Hetrogenous (many types of minerals), Homogeneous (one ...
It looks like Aurora Borealis shooting over a mountain range, but it's not.. This is a photograph of a gemstone taken under a microscope. If you're thinking, "I could look at these breath taking ...
The process of identifying minerals under the microscope is fairly subtle, but also mechanistic – it would be possible to develop an identification key that would allow a computer to do it. The more difficult and skilful part of optical petrography is identifying the interrelationships between grains and relating them to features seen in hand ...
A conoscopic interference pattern or interference figure is a pattern of birefringent colours crossed by dark bands (or isogyres), which can be produced using a geological petrographic microscope for the purposes of mineral identification and investigation of mineral optical and chemical properties.
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