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PREFERRED TERM
opal  
TYPE
  • http://purl.org/net/provenance/ns#DataItem

DEFINITION
  • Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid - http://en.wikipedia.org/wiki/Opal
DESCRIPTION
  • Opal is a hydrated amorphous form of silica; its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid - http://en.wikipedia.org/wiki/Opal
IDENTIFIER
  • opal
TITLE
  • opal
URI
http://inspire.ec.europa.eu/codelist/CommodityCodeValue/opal
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EQUIVALENT CONCEPTS
Commodity Code