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Opal-A
A variety ofOpal
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Unique IdentifiersOpal-AGA type ofOpal consisting of aggregated spheres of amorphous silica, with water filling the gaps in between.Precious Opal andPotch Opal consist of this kind of structure - the difference being in the regularity of the sizes of the spheres and packing.
... Opal-AN Opal-AN is a term for amorphousopal with a glass-like structure (Graetsch, 1994). The "A" in the name stands for amorphous; the subscript "N" is to imply its structure is network-like similar to silica glass; however, it still contains about 3-8% water, ...
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