PREHNITE from a |
classic old New Jersey locality!
These specimens are from a series of pockets found quite by accident, at this old locality. They are typical of the style found here 100 years ago at the turn of the 1900's, of the sort that are found today only in museums and a few older collections as they recycle. As such, it is a rare opportunity to own today, a historic style of prehnite from this classic locale. These prehnites formed as casts and replacements of an earlier generation of anhydrite crystals, and many show the visible signs of casting from below, and are partially hollow (which adds to their translucency!). Unlike the older specimens, these were collected carefully and many have no damage after preparation, and the fingers are not repaired back on. I purchased approximately 500 specimens from this find - it was a big pocket that extended inwards into smaller pockets! Of these, many had damage or had a grungy cement-like coating that was difficult to remove. These pieces required extensive trimming to prepare and remove peripheral damage, and extensive chemical work to clean the coating. Only about 10% cleaned to have the top lustre and a nice apple-green color, and are offered here. I will have much of the remainder of our specimens for sale at the Springfield (Massachusetts) show in August, at much cheaper prices for the pieces that had a little more damage or a little more coating retained. But most of the best pieces recovered are presented here.
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A pretty plate of solid prehnite. Mostly nubby, short fingers of prehnite totally cover this plate. They are all very lustrous and translucent and of a light apple-green color. The largest finger reaches 3.5 cm in length, flat-laying. The bottom face shows evidence of hollow casts after anhydrite, upon which the prehnite formed. Tip-breaks, damage, to a few of the relatively minor prehnite tips in no way detracts from the specimen overall , but on close examination I do find them detracting and thus this is a much lower price on a big plate.
This is a solid plate of very lustrous and translucent, light apple-green fingers of prehnite, to 4.5 cm in length. The bottom of the specimen has clear evidence of hollow castings after anhydrite upon which these "fingers" form. The prehnite at the top really gives a nice horizon to this piece, and so it has good display quality for the size and price range.
This is a large plate covered in a jackstraw arrangement of slender fingers, to 7 cm in length, of translucent, light apple-green, prehnite. Most of the prehnite here is of the finger habit, where it formed as a thick overgrowth on earlier anhydrite. The largest crystal, though, shows the straight lines of the anhydrite replacement more closely and preserves the original crystal habit with better fidelity. There is some kind of oriented coating of another mineral on the backs of the crystals, that reduces the light coming through, and hence the color a little bit, but the prehnites facing the viewing angle are lustrous and apple-green and the piece as a whole is impactful. As with many larger pieces from this pocket, several fingers are broken, but here they are minimal to the display view and picked down to their roots, so they do not detract much except on close inspection and from the side views (though I mention it to explain the lower apparent price here for a very large cabinet piece, to be fair about amortizing the values). Damage to the tips of a few little fingers is insignificant when the whole specimen is taken in context . The bottom of the specimen exhibits clear evidence of hollow casts after anhydrite, upon which the prehnite formed. This is a major matrix piece, and large for having no repairs by any historical standard here. Dramatic and 3-dimensional!
A concave plate with lustrous, translucent prehnite fingers to about 3.5 cm, splaying out every which way. There is a minute coating in some crevasses which won't clean off, which has the effect of darkening the color a bit, but it is still a nice apple-green hue. No damage to the display face. Although the piece displays 3-dimensionally when stood up vertically on a base, it sits a little flat, hence a lower price for the display quality and size
This is a jackstraw arrangement of mostly nubby prehnite fingers, flatlaying but to nearly 5 cm in length, on a thinnish matrix plate. They are all very lustrous and translucent,and exhibit a light apple-green color. Nice large piece for the price, which displays 3-dimensionally when sat upright
A superb, 3-dimensional piece with excellent display qualities, fingers sticking up and out ever which way. The fingers, to 3.5 cm in length, are very lustrous and translucent. A nice accenting calcite crystal of just under an inch, is in association. The bottom of the specimen exhibits signs of how these form as growths over the now-hollow casts after anhydrite crystals. This plate actually is one of the more visually imposing, but regrettably it has one broken tip (in the lower left) and so we have more than halved the price compared to the other pieces here - all cherrypicked for minimal damage from a group of 500 pieces. Nevertheless, this is a fine specimen and now is priced at a relative bargain compared to others here, for the size and display aesthetics.
This specimen exhibits 2 habits of prehnite, all formed as casts after anhydrite. It has both the form of "stalactite"-like prehnite after anhydrite that look just like fingers , formed by thicker prehnite casting and overtopping anhydrites that then dissolved away; and it has others crystals that have a sharp, more anhydrite-looking appearance with nice angles. All are very lustrous, translucent with fine light apple-green color. Hollow casts of what were once anhydrite can easily be discerned looking up from the bottom. A large, dramatic, and VERY interesting specimen showing exactly how these kinds of minerals form as replacements of previous species. It is also big and showy, as well as educaitonal in that regard...the best of both worlds for a pseudomorph. As a classic US piece, this cabinet specimen would have looked at home in any museum as a typical example of what was found here a century ago, but such large pieces are rare (then and now), and few would be in such good condition.
A sculptural cluster of very lustrous and translucent, light apple-green fingers of prehnite. Although the bases are embedded into matrix, you can say that they would reach 5 cm in length. There is a lot of 3-dimensionality here that is hard to convey. On the bottom of the specimen there is clear evidence of hollow casts after anhydrite. Very Nice piece for the price
This is a very 3-dimensionalcluster of very lustrous and translucent, light apple-green fingers of prehnite, to 4 cm in length. Evidence exists on the bottom of their formation as ast epimorphs- you can see the hollow casts after anhydrite that they coated and replaced. Very nice display piece for the size, and complete all around, this looks good either horizontally OR vertically and has a lot of display options.
A sharp cluster of angled fingers of very lustrous, translucent, light apple-green prehnite to 4.4 cm in length. They have converged to form a "delta" shape. There is clear evidence of hollow casts after anhydrite on the bottom of the specimen. In fact a hollow cast transverses the length of the longest finger. Wonderful, close-packed aesthetics and good color make this a super deal among the lot
A cluster of several very lustrous, translucent, light apple-green, fingers of prehnite to 4.5 cm in length. These are all enclosing hollow casts after anhydrite, including one that transverses the length of a flat-lying, rather wide finger. The piece presents a large and showy display face, with crystals shooting out in all directions.
Like sentinels on guard, three vertical, very lustrous and translucent, light apple-green, prehnite fingers, to 6.1 cm in length, hold sway over the plate below. Amazingly, this plate is composed of two hollow casts after anhydrite that start as one and bifurcate into two separate "fingers", which you see from underneath looking up into the hollows. A wonderful and fascinating specimen with different form from others here - the crystal habit preserving the original anhydrite crystal form that the prehnite replaced, with more fidelity. Complete all around! See the view looking up from the bottom, showing it is hollow (but solid)
A jackstraw arrangement of translucent, light apple-green prehnite fingers, to 6 cm in length, that exhibits evidence of several hollow casts of what were once anhydrite underneath. One, in particular, transverses the length of the longest crystal. The specimen just is a little weaker on lustre and color than others here but is a fascinating and fine example for quality and form, with no damage and a 360-degree display angle. If it came out of a museum with an old label, you would not be surprised as it so well emulates the oldstyle pieces found here long ago
This is an excellent, rather elegant cluster of very lustrous and translucent, light apple-green, prehnite fingers, to 4.5 cm in length. The bottom of the specimen has numerous hollow casts after anhydrite, including one that tranverses the length of the largest prehnite finger. The two larger fingers in the middle cross dramatically and splay out like a "V" sign. Nice from either side, this is to my eye one of the better small cab specimens without really breaking the bank
Two crossing crystals of lustrous and translucent, light apple-green prehnite are both doubly-terminated and reach 7 cm in length. They are actually incredible hollow casts, retaining the shape of the original anhydrite crystals, and the cavities inside transverse the length of each "finger." Here, the prehnite has really not formed stalactite-looking fingers as in other pieces here, but preserves a more typical, wide-breadth anhydrite habit and so the piece looks extremely geometric. Amazing!
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