A noteworthy large thumbnail / toenail specimen of this beautiful newly discovered material This has a dramatic formation of Opal with graceful, smooth “ridges” of tightly packed glass-like “beads” of Hyalite which can be seen on all sides of the piece. The specimen doesn’t look like a mineral because of the almost organic nature of its shape. Secondly, the color is very attractrive as it shows the distinctive “Blood Vessel Opal” appearance with small areas of red-orange inclusions of iron oxide which have manifested in thin “capillary”-esque lines below the surface of the Opal. Lastly, there is a small opaque white layer of Precious Opal that can be seen in the center and back of the piece giving it a pleasing overall presence. This one is lovely and eye-catching, and a nearly damage free all the way around. One could display the piece from a few angles as well. A tiny bit of attached matrix at the base makes for a great touch as well.
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".
** PLEASE NOTE: We use professional grade UV lights to photograph all of our pieces, which are pure UV and more powerful than virtually any UV lights that can be purchased at retail stores. Lights purchased outside of scientific suppliers often have mixed wave bulbs with a much lower wattage, and not all minerals (including Opal) fluoresce under different UV waves. For example, these particular Hyalite Opals show strong green fluorescence under short wave UV but almost no fluorescence under long wave. Therefore, they do not fluoresce well under mixed wave lights.
Locality: San Luis Potosi, Mexico
Specimen Size: 3.3 x 2.8 x 2.8 cm (miniature)
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Last updated 3 July 2022.
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