@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/8143e95e-a438-4a2a-82b2-6d7ae079fba7>
  skos:prefLabel "Photon/Optical Detectors"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/5b9da836-cd16-4dab-b1ff-be1588738ef8> .

<https://gcmd.earthdata.nasa.gov/kms/concept/5b9da836-cd16-4dab-b1ff-be1588738ef8>
  skos:definition """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."""@en ;
  skos:prefLabel "PETROGRAPHIC MICROSCOPES"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/8143e95e-a438-4a2a-82b2-6d7ae079fba7> ;
  a skos:Concept .