Wow, I was impressed when I saw this piece as the sheer aesthetics are almost unheard of for the material. Typically it’s impossible for these Hyalites to form in such a pleasing three-dimensional shape, but this piece breaks the mold. Not only is it incredibly showy, but it has a wide range of colors starting with a fiery orange-red hue on one end which grades across the specimen into nearly colorless / pale golden color and is actually opaque WHITE at the base. The gemmier portions of the piece have great luster and that classic “glass-bead” like appearance that is well known in Hyalite. For an added touch, there’s even a contrast of textures on the piece, where some of the globules are smooth and glassy, while other have a coarse surface. Lastly, the richer colored areas are a textbook example of the “Blood Vessel Opal” from this locality where the iron oxide inclusions have formed thin lines near the surface to give it an almost organic appearance. Very good quality and highly displayable. Only a little damage mostly on the back / sides of the piece.
At the beginning of 2016 a friend of ours started working a claim with a few of the locals in the state of San Luis Potosi for this fine quality Hyalite Opal. It's very exciting to see specimens of this calibre coming out of the ground, as most of the Opal from this area is not nearly as attractive or fine quality as the pieces in this lot. I apologize for not having a more specific locality, but our friend doesn't want to divulge the information yet as he is trying to keep it under wraps until he feels that he was able to collect everything.
Our friend dubbed some of the colored material “blood vessel” Opal due to the interesting red/orange “capillary”-esque lines that can be seen in many of the specimens. Essentially, the Opals themselves are colorless, but minute inclusions of what I’m assuming is iron oxide have created not only beautiful internal color, but the thin “blood vessel” patterns.
Like most Hyalite specimens, these new pieces from Mexico show a brilliant glowing green fluorescence under SW UV light.
Finally, for years this material was referred to as "Hyalite" Opal, but is now listed as a variety of Opal called Opal-AN. It is now defined specifically as an amorphous (often colorless) form of Opal that is found in spherical aggregates, which are often intergrown or stacked with a "bead"-like appearance. For reference, mindat.org states that: "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".
Locality: San Luis Potosi, Mexico
Specimen Size: 3.6 x 3.3 x 1.5 cm (miniature)
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