Tag: minerals

Oct 15, 2013

Picture of the Day: Sunset Fire Opal

Picture of the Day: Sunset Fire Opal

SUNSET FIRE OPAL Photograph by Jeff Schultz | gemstoneJEFF on Flickr In this beautiful close up by gemstone hobbyist Jeff Schultz, we see a stunning Mexican fire opal. When illuminated just right, it looks like a sunset above the clouds. According to Wikipedia, fire opals are transparent to translucent opals with warm…

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Sep 12, 2013

Finding the Ocean Inside an Opal

Finding the Ocean Inside an Opal

Opal is a hydrated amorphous form of silica. Its water content may range from 3% to 21% by weight, but is usually between 6% to 10%. Because of its amorphous character it is classed as a mineraloid, unlike the other crystalline forms of silica which are classed as minerals. It is deposited at a…

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