3-071f15-th.jpg
Description:
Hyalite opal (opal-AN), or glass opal is an amorphous material with a structure similar to silica glass. Image courtesy of James St. John on Flickr. License: CC BY.
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3-071f15-th.jpg
Alt text:
A pearlescent sap-like substance on a rock.
Caption:
Hyalite opal (opal-AN), or glass opal is an amorphous material with a structure similar to silica glass. (Image courtesy of James St. John on Flickr. License: CC BY.)
Credit:
Image courtesy of James St. John on Flickr. License: CC BY.
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Fall
2015
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