Petrographic microscopes

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  • Petrographic Microscopes
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  • PETROGRAPHIC MICROSCOPES are microscopes used with The Geological Survey of Japan (GSJ) who has issued 31 rock reference samples for the analysis of major, minor and trace elements, isotopic compositions and isotopic ages. The purpose of this standard reference material project in Geological Survey of Japan is to improve and check the reliability of analytical data obtained from different methods and different laboratories.
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Abstract from DBPedia
    A petrographic microscope is a type of optical microscope used in petrology and optical mineralogy to identify rocks and minerals in thin sections. The microscope is used in optical mineralogy and petrography, a branch of petrology which focuses on detailed descriptions of rocks. The method is called "polarized light microscopy" (PLM).

    偏光顕微鏡（へんこうけんびきょう、polarization microscope または polarizing microscope）は光学顕微鏡の一種。試料に偏光を照射し、偏光および複屈折特性を観察するために用いられる。偏光特性は結晶構造や分子構造と密接な関係があるため、鉱物学や結晶学の研究で多く用いられる。他、高分子化学や液晶の研究、細胞の偏光性構造の研究などにも用いられる。

    (Source: http://dbpedia.org/resource/Petrographic_microscope)