Mineral Specimens with Fluorite

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flu23 - Fluorite on Sphalerite with Pyrite inclusions - $ 475
Gibraltar Mine, Naica, Chihuahua, Mexico
miniature, 6.0 x 4.5 x 4.4 cm

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Fluorite on Sphalerite with Pyrite inclusions from Gibraltar Mine, Naica, Chihuahua, Mexico [db_pics/pics/flu23a.jpg]

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Fluorite on Sphalerite with Pyrite inclusions from Gibraltar Mine, Naica, Chihuahua, Mexico [db_pics/pics/flu23b.jpg]

A stunning miniature with a 3.5-cm complex crystal cluster atop. This looks like a mountain rising out of a nest of surrounding trees , I think...the single large and sharp, gemmy, cuboctohedron in the middle just risign above the surrounding minutely crystallized fluorite! All perched on a nice mound of crystallized sphalerite and complete all around.

flu27 - Fluorite with Quartz on Galena on Sphalerite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 10.5 x 9.3 x 7.3 cm

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Seven TRANSPARENT, gemmy, undamaged cuboctohedral crystals to 3 cm in size perch like mountainclimbers upon this mound of crystallized galena (actually a carpet of galena over a mound of underlaying sphalerite). The contrast is striking! The association with galena is CLASSIC for Naica, for old material. For this NEW find, it seems rather unusual as most of the associations are with sphalerite. Also, the frozen waterfall of sparkling crystallized quartz running down the center of the piece provides a nice accent and some sparkle...and is itself unusual in the occurrence. The piece is large...so the pictures really have trouble conveying how impressive this is, and how starkly frog-eyed the fluorites look in person as they leap out at you from the contrasting galena. It is therefore much more 3-dimensional and impressive in person!

flu28 - Fluorite with Calcite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 10.0 x 9.3 x 8.7 cm

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Fluorite with Calcite from Gibraltar Mine, Naica, Chihuahua, Mexico [db_pics/pics/flu28a.jpg]

This unusual Naica piece is more starkly octohedral than others you normally see from the locale. It is actually the only OLDER specimen slipped into this update of newer material. It dates from , probably, the early 1980s. The piece has two large octos in the middle, coated in front by a blanket of dogtooth calcites. The contrast is very nice! The octos have SLIGHT cubic modifications, you can see, at their very tips. But they are still more octo than cube by far and as such are the exception at Naica.

flu29 - Fluorite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 11.4 x 9.2 x 8.1 cm

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This really large grapefruit-sized cluster of solid fluorite is VERY impressive for overall flash and the number of bevelled crystals per square inch. It is , however, slightly damaged with a ding here and there, and one broken crystal ont he left-lower edge. Now, they do not immediately detract, but they are there. So, I priced this down from the initial $1250 I would have put on it to make up for those small defects. The whole piece is translucent to transparent, and it is otherwise completely crystallized all around, with galena and sphalerite attached in back. The large crystal atop is over 3 cm and fully formed, very 3-dimensional!

flu30 - Fluorite on Sphalerite - $ 850
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 7.1 x 6.2 x 4.8 cm

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The pics pretty well convey here the stunning 3-dimensional crystalography of this specimen, featuring a large "doublet" cuboctohedron with a strangely elongated horizontal axis perched atop a smaller crystal showing more cubic and less octohedral faces. The large crystal is 5.5 cm across and is totally transparent and clean. The crystals stick out dramatically from the underlaying sphalerite matrix (crystallized), which you can look through the smaller crystals and see on the bottom, plus from the underside and sticking out around the edges of the lower fluorite clusters. The piece has a pale color,mostly colorless but with a hint of pastel green floating in the core. For overall geometry, this is one of the most dramatic pieces I have seen from the place, and REALLY leaps out at me.

flu31 - Fluorite with Pyrite inclusions - $ 850
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 6.3 x 6.2 x 5.6 cm

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A stunning crystal cluster of the deeper green hue from the pocket, perched against a large crystal that is nearly colorless...and both intergrown so complexly that you have to sit and stare to make sure this isn't the same continuous crystal inexplicably changing on us. In person, you can see this is a very 3-dimensional piece. It can be displayed from about 4 different angles to show green on clear or both side by side, as you wish. It is complete all around, save only a contact on the back side and some galena attachments on the back; and totally undamaged.

flu33 - Fluorite with Pyrite inclusions on Sphalerite - $ 2500
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 8.2 x 7.6 x 4.1 cm

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One of the most striking pieces in this find, that I know of, and one of my favorites of all Naicas I have seen, 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, jetblack sphalerite matrix. This is a superb specimen by any standard, and shows the "classic" cuboctohedral habit of Naica at its best. The lustre and transparency are top class, by any standard. 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 , killer-quality sphalerite that is more common in this pocket is really quite unusual for Naica in any quantity, and with good fluorite in association.

flu34 - Fluorite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 15.2 x 11.3 x 8.0 cm

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A large 4 cm crystal atop makes a dramatic capstone to this floater plate of solid fluorite! It is entirely translucent, has good green color, and excellent bright interiors to the crystals. Like many from this pocket, it seems to have broken off from matrix and then recrystallized minutely on the bottom break and the edges, so that now it is even complete all around the sides (microfaceted, if you will). The piece is pristine except for one small unobtrusive daamaged crystal on the left side as shown here - nothing that visibly detracts, in context. It is otherwise , again, complete not only on the front but a floater all around! The piece, because of its good size and color, and complete translucency, displays really well!

flu35 - Fluorite with Galena - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 9.4 x 6.8 x 6.3 cm

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Large, GEMMY, transparent, green cuboctohedral crystals to a whopping 4 cm, surmounting a knoll-shaped cluster of smaller crystals, also play host to a brilliantly lustrous 2-cm galena crystal! The galena is nestled in a sphalerite embrace, so you have silver on black on green...VERY bright combo, in person! The piece is entirely 100% translucent and is also a floater with a recrystallized break on the bottom contact, and complete even around the backside.

flu36 - Fluorite and Sphalerite - $ 950
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 8.0 x 5.5 x 5.0 cm

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Stunning cluster of two gemmy, EXTREMELY COMPLEXLY STEPPED AND MODIFIED cuboctohedra, separated by a lustrous sphalerite cluster which each partially overgrows as they almost meet in the middle. The contrasts is strikign and the 3-dimensionality more impressive in person. It is one of the better small cabs in the lot, to be honest, but so hard to convey with pics that we downgraded the price a bit to move it when really it look smuch better in person!

FLU37 - Fluorite on Sphalerite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
small cabinet, 9.2 x 7.9 x 6.3 cm

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A sharp specimen with a leaning tower of intergrown crystals perched one atop another and leaning out over the sphalerite matrix to present out to you that 3-cm cuboctohedron floating at the right. The rest of the cluster shows more classic Naica "stairstepping" and complexly bevelled crystals closer to the cubic habit, but with lots of outgrowths. Like many from this pocket, even the back is munitely crystallized or rehealed after an old break, making this complete all around and entirely translucent.

flu38 - Fluorite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 11.0 x 9.4 x 5.3 cm

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This large specimen features a 4.5 cm (almost 2 inch!) GEM-CLEAR crystal perched atop a stack of smaller fluorites, all showing the cuboctahedral form but without the usual stairstepping we see from Naica. These ar etherefore much cleaner and sharper edges, with simpler geometry, that make the crystals really stand out a bit more from the matrix. The colro grades form clear at the edges to a pale green in towards the core. There is no damage and the crystals are complete all around, even around the sides, to the back! There is sphalerite contacted in the middle of the back but this is nearly a floater specimen, again with crystallization right around the edges on all sides and making the crystals thus look very freestanding.

flu40 - Fluorite - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 31.0 x 19.0 x 7.3 cm (weight : 13 pounds

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I have NEVER in 23 years seen such a massive fluorite plate from Naica as this one! It is solid fluorite, completely made up of bright and TRANSPARENT xls to 3.5 cm. There is no damage at all to the display face, just the inevitable contact aorund the sides where it was removed, as you'd expect. Even so, it has great horizons on most edges, with 3-dimensional crystals overhanging the edge...very well trimmedout, I would say. In person, its actually more 3-dimensional than flat, aided in the appearance by the superb bevelled crystals popping out at you like bug eyes. In person, this has an overall pleasing green color although some of the larger crystals are more pale than the core. It is an impressive specimen for the locality, but the complex crystal forms present make it really impressive by worldwide standards too, for sheer number of faces on one plate here!

flu41 - Fluorite on Galena with Quartz - SOLD
Gibraltar Mine, Naica, Chihuahua, Mexico
cabinet, 17.8 x 14.5 x 10.5 cm

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Over a dozen TRANSPARENT, gemmy, undamaged cuboctohedral crystals to 3 cm in size perch like mountainclimbers upon this mound of crystallized galena. The contrast is striking! The weight is also striking - probably over half a dozen pounds here. The association is CLASSIC for Naica, for old material. For this NEW find, it seems rather unusual as most of the associations are with sphalerite. Also, the rivulets of sparkling crystallized quartz running down the seams of the piece provide a nice accent and some sparkle...and are themselves unusual in the occurrence. The piece is large...so the pictures really have trouble conveying how impressive this is, and how starkly frog-eyed the fluorites look in person as they leap out at you from the contrasting galena. It is therefore much more 3-dimensional and impressive in person! Since its so heavy and so hard to photograph, I am making it $950 instead of $1950 as it probably should be to ensure i sell it and don't have to carry it around here at the office!

flu50 - Fluorite on Sphalerite - $ 750
Naica, Chihuahua, Mexico
small cabinet, 8.2 x 5.0 x 4.0 cm

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A cluster of gemmy, pastel green fluorite crystals to 4.0 cm across sit on a few splendent black crystals of sphalerite, to 2.5 cm across. The fluorite crystals are cubes that are modified by octahedral faces, and all are transparently clear right to the cores within (some speckled by included pyrite). A lovely color contrast!

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Rob Lavinsky, rob@irocks.com

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