Mineral Specimens with Andradite|
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Glassy and gemmy, deep green, demantoid crystals, to 1 cm across, are scattered about aesthetically from top to bottom on massive garnet matrix. Several crystals are also doubly terminated. There are 5 crystals to about 1 cm, and the eye goes right to them. The piece as a whole is 3-dimensional and not a flat plate, as it appears in the photos. Really, neither are the garnets - they "pop out" quite nicely. The color here is slightly olive-hued, not quite the most rich green, but very good nonetheless. Lustre and transparency are high.In fact the color looks Italian, in hue , but with better lustre than usual. If this were Italian, it would be twice the price, from the classic locales there!
One of my personal favorites in the lot, this is a particularly elegant clustre on matrix, isolated, and with a stunning dominant crystal atop. This appealing demantoid specimen is composed of seven glassy and gemmy, richly green crystals to 1.5 cm across. The color and form of the crystals contrasts superbly with the underlying, white, massive garnet matrix (the matrix having been metamorphosed geologically from limestone to garnet, itself). Few specimens here, even those with more garnet, leap out to the eye a smuch as this, for the stark contrast and the top color. The main crystal here is so gemmy that you can really look right through it to the underlaying matrix, clear as day!
A limestone, metasomatized to massive garnet matrix, is host to sharp and isolated, glassy and gemmy, light emerald-green crystals of demantoid, to 1.2 cm across. The large crystal is also doubly terminated. For perfection of form, and gemmy crystals of high quality as a representative piece from the find, a superb example
Sitting on contrasting, massive garnet matrix is a drapery of interconnected glassy and gemmy, olive-green demantoid crystals to 1 cm across. They have superb glassy lustre! The large display face is very rich, and pristine except for one small ding in the middle, on a large crystal's side face. Several crystals exhibit clear evidence of hopper growth, rarely seen in the garnet family.
Topazolite is a rare variety of andradite garnet, and this specimen hosts what surely must be among the larger crystals of the species. Clustered on contrasting matrix, this superb matrix topazolite specimen features glassy and gemmy, olive-green to cognac-colored crystals, to a whopping 2.5 cm across (HUGE). The large crystal, as well as one or two others, exhibits incipient hopper growth patterning, which is rarely seen in the garnet family of minerals. All crystals on the display face are pristine and complete! Also, even in the photos you can see they are 100% transparent, so gemmy you can look right through the garnets to the underlaying matrix.
Rich, cognac colored crystals of glassy and gemmy topazolite, to 1.7 cm across, are widely scattered on a matrix of limestone, metasomatized to massive garnet. Topazolite is a rare variety of andradite garnet, and this specimen hosts what surely must be among the larger crystals of the species. Several crystals are doubly terminated and a few exhibit clear evidence of hopper growth (unusual in garnets) - what appears to be a spot of damage in the photo, on the smallet of the 4 major crystals in the top cluster, is actually this strange, inward-hopperig growth pattern. Dr. Federico Pezzotta, on obtaining the majority control of the garnet production here back in 2008, has gotten to see more than anybody of the breadth of the find. This particular specimen is the one used in his slideshow at the Tucson 2010 show, to illustrate the highest quality of the topazolite crystals from this mine. He specifically pointed out that he considers this specimen to be the top, or at least among the top few specimens, of topazolite from this mine. Since these are apparently the world's best topazolites, for overall size and quality, that is high praise indeed.
Very fine, glassy and gemmy, olive-green crystals, to 1.8 cm across, lie flat on a massive, whitish garnet matrix. Some crystals are doubly terminated and at least two exhibit clear evidence of hopper growth, rarely seen in the garnet family of minerals. The crystals are extremely large for topazolite. They have superb lustre, and most are translucent enough to look through to the matrix underneath. Interestingly, this is a intermediate brown to green in color, and it is unclear whether to classify this particular hue as andradite variety demantoid, or variety topazolite.
Nestled aesthetically in a massive, metamorphosed garnet matrix, is a cluster of glassy and gemmy, rich, cognac-colored crystals of topazolite. In size they reach to 1.5 cm across. A few crystals exhibit clear evidence of hopper growth, rarely seen in the garnet family of minerals. The crystals are extremely large for topazolite. They have superb lustre, and most are translucent enough to look through to the matrix underneath (as you can see in the photos). Interestingly.
A beautiful specimen that leaps out at you, with riveting color! This is a cluster of glassy and gemmy, deep-glowing-green demantoid crystals, to 1 cm across. The garnet spread, in 3 dimensions, contrasts nicely with the whitish, massive garnet matrix. The largest crystal exhibits incipient hopper growth, rarely seen in the garnet family of minerals. Overall, this specimen has a good 3-dimensionaliy and even a bit of a curve to it, and is much more impressive in person. It is one of our favorites in the lot.
This is a solid plate of glassy crystals with INTENSE color! Most garnets from here do not form in such tight carpets of fine crystals. They tend to be more dispersed across the matrix. Some people like isolated crystals, and others like "flash" and density , which is exemplified in this specimen. The glassy lustre combined with strong color pretty much blow away most other demantoid specimens from other locales, and it ranks high for this locality as well. The massive garnet matrix is slightly concave, and is completely smothered by these briliantly glssy crystals of demantoid, to 1.2 cm across. A few crystals are doubly terminated; and a few also exhibit clear evidence of hopper growth, a rarity in the garnet family of minerals. Overall this is one of the most densely covered and flashiest specimens I have been able to obtain from the finds here.
This unusual and lovely demantoid specimen hosts glassy and gemmy, light emerald-green crystals, to 1 cm across, emplaced on a sugary, massive garnet matrix. The matrix is actually sparkly, itself. Growing on the matrix and among the garnet crystals are lustrous, white crystals of stilbite, to nearly 1 cm in size. This is one of only 3 specimens in this lot that have associated stilbite. Stilbite is not only just a rarity for this deposit, it is an extreme rarity in association with garnet from ANY locale and serves to highlight the bizarre geology of this deposit. From my understanding of things, there is still not a very good explanation for how the stilbite got here. Overall this is a fine, display quality miniature with subtle unique qualities, and the contrast to the white stilbite is one of those bonuses.
A matrix of limestone metasomatized to massive garnet is host to a single glassy and gemmy, rich, cognac-colored crystal of topazolite. The crystal, lying flat on the matrix, is doubly terminated, 1.5 cm across, and is a rare, perfect, isolated gem crystal ! It has a few very small zones of slightly inward-hoppered growth, which is unusual and interesting. It has superb lustre, and transparency. You can look right through it to the matrix beneath! This is actually a miniature (large) when set up diagonally.
Perched aesthetically, high on a contrasting white matrix of massive garnet, is a single glassy, gemmy, light emerald-green, demantoid crystal measuring 1.35 cm in length. There are hints of incipient hopper growth present. Graceful and elegant, it is rare to find such a large and isolated crystal. The termiation is fully exposed and freestanding!
On a matrix of white masive garnet are perched two glassy and gemmy, olive to cognac-colored crystals of topazolite to 2 cm across. This is a rare and excellent size for the species. Both crystals are doubly terminated and both exhibit small regions of unusual, incipient hopper growth. Members of the garnet family, other than this find, rarely show this growth pattern. Aesthetically isolated on contrasting matrix, this is an excellent topazolite from any locality - but would be hard to find in this quality elsewhere, from previous finds. Perhaps more than the demantoids (which cost a lot more and are highly valued for sheer color pizzazz), this locale will be remembered for its topazolite.
A sinuous ribbon of glassy and gemmy, light olive-green demantoid crystals, to 1.5 cm across, is perched high on a white massive garnet matrix. A few of the crystals are also doubly terminated. The richness of the piece is good, as are the size of the crystals. The color is a little more olive than intensely green, but still at least comparable to most Italian demantoid of past finds, and pretty good by any standard. For overall aesthetics and richness in this price range, I thought this one of the better deals in the lot.
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