Sentence Examples

  • The only known mineral of which it forms an essential component is the rare mineral crookesite of Skrikerum, Smaland, Sweden, which, according to Nordenskidld, contains 33.3 per cent.
  • It is occasionally found in the native condition, but more frequently in combination with metals in the form of selenides, the more important seleniferous minerals being euchairite, crookesite, clausthalite, naumannite and zorgite.