Opal

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...

Sold Individually What is it: Opal is a hydrated amorphous form of silica; its water content ranges from 3-21% by weight, but is usually between 6-10%. Depending on formation conditions, opal may be transparent, translucent, or opaque while it's color...