Opal : SiO2·nH2O
Photo added to mindat.org
“Amazing Opal speciemen from El cobano mine, El Salvador Jalisco. Impresive size 47mm. x 38mm.”
Sergio Romero P. - 28th November 2006
Mindat.org Photo of the Day
Sergio Romero P. - 5th December 2006
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