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18 Various Kinds of Opals
When most people think of an opal, they might think of a milky-colored stone containing a rainbow of stripes or flecks inside it. What many people don’t know is that they are incredibly diverse in appearance, and are not actually minerals. Opals are a solid, amorphous form of silica, and are classified as “mineraloids”. Like other mineraloids, such as amber, pearl, and obsidian, they lack structural order, or “crystallinity”.
From the top:
Black Opals
Cat’s Eye Opals
Dendritic Opals
Flamingo Opals
Peruvian Pink Opals
Zebra Opals
Leopard Opals
Yowah Nut and Koroit Opals (both have the same characteristics - they merely come from two different areas).
Brown Opals
Ethiopian Honeycomb Opals
Green Opals (Serbian, Tanzanian, and Brazilian)
Peruvian Blue Opals
Matrix Opals
Landscape Opals (Andean and Australian)
Mexican Fire Opals
Crystal Opals
Australian Boulder Opals
Ethiopian Ribbon Opals
(Side note - the image backgrounds are transparent, except for the matrix/landscape picture, which seems hellbent on being an asshat, no matter how many times I try to fix it)
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Can we just take a minute here to appreciate opals?
From top left:
Boulder opal.
Ethiopian opal.
Black crystal opal (considered the “Holy grail” of opals).
Andamooka matrix opal.
Yowah nut opal.
Mexican fire opal.
Mezezo opal.
White harlequin opal.
Panel boulder black opal.
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I think it’s finished - this bit of #opal #photomicrography. But I’m not finished with #opals!
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Back to work. Let’s get some boulder #opal under the scope. Photo credit: @cassloop
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