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Mineral Specimens with Fluorite
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8.2 x 7.6 x 4.1 cm. One of the most striking pieces in this find that I know of, for the startling gemminess of the crystals which show bright pyrite inclusions floating inside; for the perfection of the display face; and the balanced aesthetics and contrast on bright, jet-black sphalerite matrix. This is a superb specimen by any standard, and shows the "classic" cuboctahedral habit of Naica at its best. The lustre and transparency are superb. The pyrites make it, though. Also, pieces like this are very distinct form earlier finds which had much more prominent galena association and less of the sphalerite. The rich, superb sphalerite that is more common in this pocket is really quite unusual for Naica in any quantity, and with good fluorite in association.
15 x 12 x 7 cm. A stunning combination piece with two clusters of gemmy, transparent fluorite flanking a central tower of crystallized sphalerite. The sphalerite is lustrous and glassy. The fluorites are totally clean and transparent - and free of any damage. The fluorite clusters measure 5 and 8 cm vertically, and each is terminated on the bottom end as well if you look at the undersides. The fluorite on the left is nearly colorless with a faint lavender hue, and the one on the right is nearly colorless with just a faint green pastel hue in some lighting. They are essentially colorless though, and so the geometry is all the more apparent as you look into each complex cluster. The stark contrast of the lustrous, jet black sphalerite between the two fluorite clusters is superb. Also, pieces like this are very distinct form earlier finds which had much more prominent galena association and less of the sphalerite. The rich, superb sphalerite that is more common in this pocket is really quite unusual for Naica in any quantity, and with good fluorite in association.
9.5 x 7.8 x 5.6 cm. A striking Ruyuan fluorite specimen. A 6.0 cm, lustrous, translucent, lightly etched, green fluorite cuboctahedron is superbly set atop a sloping matrix of contrasting milky quartz. These fluorites came out in modest numbers for only a short time, then became scarce (see recent Min. Record China issue for more on these). It is quite hard now to find nice-looking, undamaged crystals on matrix.
6.9 x 5.1 x 2.8 cm. A showy, 3-dimensional plate richly covered with very glassy, transparent, golden-yellow fluorite cubes to 9 mm from recent finds at the Moscona Mine, Spain. This excellent, highly representative piece is essentially pristine.
4.8 x 3.4 x 1.1 cm. A classic, very sharp and showy baryte blade from the Niobec Mine of Quebec. The complete all-around, lustrous, translucent, tabular, gray crystal has an excellent, beveled termination. The crystal is wonderfully highlighted by a rich, preferential dusting of sparkly, golden pyrite microcrystals. The pyrite also coats the small fluorite cubes on one side. This is an interesting, highly representative specimen of the combination species and famous locale.
4.8 x 4.1 x 2.5 cm. A fine cluster of intergrown, translucent, "Blanchard-blue", fluorite cubes from the Blanchard Mine of New Mexico. The cubes reach 1.3 cm. Contemporary classic material.
A STUNNING SPECIMEN with water-clear, bright, lustrous, see-through green fluorite crystals perched dramatically above contrasting matrix! I know we have all seen a lot of YGX fluorites but this oen is truly special and stands out for both crystal quality and display aesthetics. 10 x 9.3 x 5.6 cm
A super-colorful plate of Sweet Home mine rhodos, featuring a dozen good crystals ranging to 2.2 cm across. The color is CHERRY and the lustre is very good on these crystals. The clarity of the crystals from this pocket is rated highly , and the crystals are transparent to translucent but edging more on the side of the former. 10 x 8 x 2 cm
A RAZORSHARP crystal to 5 cm on edge, with a riveting microlayer of purple phantom upon the surface of an otherwise seafoam-blue/green crystal, makes this specimen really stand out from teh crowd of Yaoganxian pieces out there. The major crystal is undamaged, and so translucent you can look right through it for fully an inch of its thickness. It is an exceptional piece, very hard to convey through the photos. 9.5 x 5 x 4.5 cm
10.0 x 3.9 x 3.7 cm. Rolling hills of glassy and gemmy, sparkling, colorless drusy quartz are the matrix for frosted, translucent, pastel sea-foam green octahedrons of fluorite, to 1.2 cm in length. The color, luster and texture differences seriously enhance this specimen. Some parts of the quartz fluoresce a bright green but the fluorite crystals fluoresce an intense purple.
6.6 x 5.6 x 3.2 cm. A drusy, gemmy and sparkling, colorless quartz matrix is the host for several frosted, translucent octahedrons of pastel, sea-foam green fluorite, to 1.8 cm across. Under fluorescent light, some inclusions within the quartz are a neon green color but the fluorite is an intense neon purple color. Long-wave (purple fluorite, no orange) and Shortwave UV (green specks show inside quartz, no fluorite glow) photos are included (see additional photos).
7.6 x 5.5 x 3.2 cm. A drusy, gemmy and sparkling, colorless quartz matrix is the host for several frosted, translucent octahedrons of pastel, sea-foam green fluorite, to 1 cm across. Under fluorescent light, some inclusions within the quartz are a neon green color but the fluorite is an intense neon purple color.
6.9 x 5.7 x 3.4 cm. A thin septa of sparkling, colorless quartz druse has allowed crystals of frosted, translucent, sea-foam green fluorite octahedrons, to form above and below the plate. Very 3-dimensional. Average crystal size is 1.0 cm across but the cluster atop is about 3 cm. Under fluorescent light, the fluorite is an intense purple. Very aesthetic specimen, elegant, and rich with this new fluorite.
5.4 x 5.2 x 4.3 cm. Fluorite from this locality is very old, and very hard to obtain (probably dating to the early to mid 1900s). This is a fairly intense pink fluorite, of good size, from this locale which is impossible to find on the specimen market today. It showcases a translucent 3.5-cm octahedral crystal with some stepped faces, impaled on other (partial) crystals. The whole piece is transparent, gemmy, and pretty clean when backlit. It came to the States via Burton Jirgl, a Los Angeles dealer who had served in the army in Japan in the 1950s and brought back many specimens. He sold it to John Ydren.
4.8 x 4.4x 3.9 cm. A perfect, totally pristine, translucent, 1-inch ball of botryoidal "fried-egg"-looking fluorite is here perched on a calcite crystal, on a pedestal of sparkling, white quartz points. Botryoidal fluorite is rare in nature, coming from only a few locales despite the worldwide abundance of the species. Ex. Dr. Stephen Smale Collection.
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Rob Lavinsky, rob@irocks.com
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