Opal

Opal

Opal is a hydrated amorphous form of silica (SiO2·nH2O); 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, unlike crystalline forms of silica, which are classed as minerals. Wikipedia

Opal is a hydrated amorphous form of silica (SiO2·nH2O); 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, unlike crystalline forms of silica, which are classed as minerals. Wikipedia

  • Aug 26 at 7:10 AM
  • Aug 20 at 1:48 AM
  • Aug 19 at 10:00 AM
  • Aug 18 at 7:20 AM
    ? @jira888

Aug 26, 7:10 AM

Aug 20, 1:48 AM

Aug 19, 10:00 AM

Aug 18, 7:20 AM

? @jira888

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