|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
|
MD-171774 - Pyrochlore, Vesuvianite, Phlogopite, Calcite - - Archived Oka complex, Oka, Deux-Montagnes RCM, Laurentides, Québec, Canada small cabinet, 7.0 x 5.1 x 3.5 cm.
7.0 x 5.1 x 3.5 cm. Pyrochlore is an uncommon niobium oxide, found in unusual igneous rocks, such as nepheline syenites and carbonatites, and some granitic pegmatites. The Oka area hosts a classic carbonatite complex. A pink paper arrow points to a 7 mm, sharp, lustrous and partially gemmy, reddish-brown, octahedral pyrochlore crystal jauntily perched on the edge of pearl-white strontium calcite matrix. Lustrous, olive-green vesuvianite crystals and a couple of black phlogopite mica books are a nice contrast to the matrix. Accompanied by an old John Albanese label dating from 1953-1968. Ex. George Elling Collection.
MD-179877 - Pyrochlore - - Archived Vishnovogorsk, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia small cabinet, 7.6 x 4 x 3.1 cm.
7.6 x 4 x 3.1 cm. Perched in a vug in granite, along with white, botryoidal quartz, are several, brownish-orange, pyrochlore crystals, to 1.75 cm across. There are even gemmy highlights in some of the crystals. As an added bonus there is a gemmy, yellow, acicular crystal about 2 mm long. These pyrochlores are very lustrous and sharp. Ex. Martin Zinn Collection.
MD-180063 - Pyrochlore - - Archived Tatarskii Massif, Tatarka Range, Enisei Range (Yenisei Ridge; Enisei Ridge), Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Eastern-Siberian Region, Russia miniature, 3.6 x 3.2 x 1.8 cm.
3.6 x 3.2 x 1.8 cm. A huge single crystal, with good overall octahedral form overall. These came out in the 1980s, and to market in the 1990s, impressing people for the unusual size of the sharp crystals from this locale. Ex. Martin Zinn Collection.
MD-191619 - Pyrochlore - - Archived Vishnovogorsk, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia small cabinet, 7.5 x 6.4 x 5.8 cm.
7.5 x 6.4 x 5.8 cm. A fine specimen covered with sharp, glassy and partially gemmy, burnished brown pyrochlore octahedrons aesthetically covering matrix on this very fine specimen from Veshnovogorsk, Ural Mts., Russia. Pyrochlore is an uncommon niobium oxide. Ex. Fersman Collection.
MD-221139 - Microcline, Albite, Pyrochlore - - Archived Papachacra, Belen Department, Catamarca, Argentina small cabinet, 6.0 x 4.5 x 4.0 cm.
6.0 x 4.5 x 4.0 cm. An aesthetic combination specimen from recent finds at Papachacra, Argentina. Sharp, off-white microcline crystals to 2.0 cm are scattered on the mounded matrix. The largest crystal is at the top. Pastel-blue albite crystals are richly sprinkled and epitactically grown on the microcline crystals. The real bonus on this piece, though, is the field of tiny, gemmy, octahedral pyrochlore crystals beautifully set on the lower left of the specimen (as identified for me by an Argentine native expert who has field collected here).
MD-235215 - Apatite, Pyrochlore - - Archived Miass (Miask), Ilmen Mts, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia miniature, 3.3 x 1.7 x 1.6 cm.
3.3 x 1.7 x 1.6 cm. A classic, old-time specimen of a sharp, euhedral, doubly terminated, hexagonal apatite crystal from a famous Russian locality - Miask, in the Ural Mountains. This pristine, hexagonal, floater, brown crystal, with low lustre, has numerous small pyrochlore crystals embedded in it. One of the pyrochlores has a hexagonal outline, which could result from a section across an octahedron. There also appears to be zircon present as well. Very highly representative of this famous locale. Ex. Behier Collection and comes with an old-tirne label.
MD-242464 - Pyrochlore - - Archived Vishnovogorsk, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia small cabinet, 8.8 x 5.9 x 3.2 cm.
8.8 x 5.9 x 3.2 cm. An excellent and very rich specimen covered with sharp, glassy and partially gemmy, burnished brown pyrochlore octahedrons, with flashes of gemmy red fire, aesthetically covering matrix on this very fine specimen from Vishnovogorsk, Ural Mts., Russia. Pyrochlore is an uncommon niobium oxide and crystals are usually brown and dull and earthy. Lustrous, glassy crystals such as these, with a rich lively brown color, are quite uncommon and this locality is regarded as the king for "pretty" examples of the species. Most came out in the 1980s or before, I was once told, and were released from old stashes.
MD-41828 - Pyrochlore - - Archived Tatarskii Massif, Tatarka Range, Enisei Range (Yenisei Ridge; Enisei Ridge), Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Eastern-Siberian Region, Russia cabinet, 10.1 x 10 x 10 cm
This huge 1-kilo crystal is the largest of the species that i know of, in good form. It is in fact a slightly distorted octohedron, really quite more obvious in person as it is very 3-dimensional. It is NEARLY complete all around, with a few relatively insignificant contacts and dimples that do not detract much form the sheer impact of the size and form. It has a nice vitreous, wet-looking lustre to it and so is much prettier than the dull, earthy pyrochlore we often see from this locality - in other words, its not just big, but of high quality as well. A significant rarity only recently released from a private collection! 10.1 x 10 x 10 cm
MD-63964 - Pyrochlore - - Archived Vishnovogorsk, Chelyabinsk Oblast', Southern Urals, Urals Region, Russia small cabinet, 7.7 x 5.8 x 3.0 cm
Glassy and partially gemmy, burnished brown pyrochlore octohedrons aesthetically cover matrix on this very fine specimen from Veshnovogorsk, Ural Mts., Russia. Pyrochlore is an uncommon niobium oxide. This is a superb specimen with extremely rich crystals, of high lustre, and good quality. It was found perhaps a decade ago. This is one of our "spikers" for the auction - probably the most esoteric expensive rock we have put to auction, but nonetheless a truly oustandign specimen for what it is! 7.7 x 5.8 x 3.0 cm
MRZ242 - Pyrochlore - $ 350 SOLD Tatarka River Valley, Karsnojarskij-Kraj, Siberia, Russia miniature, 3.6 x 3.2 x 1.8 cm ex. Martin Zinn
A huge single crystal, with good overall octohedral form overall, although missing a bit on the backs of two points. These came out in the 1980s, and to market in the 1990s, impressing people for the unusual size of the sharp crystals from this locale. I have not seen many since then.
MRZ309 - Pyrochlore - $ 650 SOLD Vishnevogorsk, Chelyabinsk, Oblast, Russia small cabinet, 7.6 x 4 x 3.1 cm ex. Martin Zinn
Perched in a vug in granite, along with white, botryoidal quartz, are several, brownish-orange, pyrochlore crystals, to 1.75 cm across. There are even gemmy highlights in some of the crystals. Minor contact is noticeable but considering the rarity and size of these crystals, it is insignificant. As an added bonus there is a gemmy, yellow, acicular crystal about 2 mm long. At this point this crystal is an unknown to me, but its there. These pyrochlores are very lustrous and sharp!.
RNOW-077 - Pyrochlore (1 kilo crystal!) - $ 9500 SOLD Tatarskii Massif, Tatarka Range, Krasnoyarsk Kray; Eastern-Siberian Region, Russia cabinet, 14 x 8 x 5 cm ex. Robert Nowakowski
This huge 1-kilo crystal is the largest of the species that i know of, in such good form. It is in fact a slightly distorted octohedron, really quite more obvious in person as it is very 3-dimensional. It is NEARLY complete all around, with a few relatively insignificant contacts and dimples that do not detract much form the sheer impact of the size or of the symmetry. ex Gerald C Herfurth Collection #2810, Herb Obodda, Robert Nowakowski Collection #RN77. Mass is 1023 grams All Content and Design ©1996-2010 The ArkenstonePowered by http://mineralwebsites.comBy-species Galleries | ||||||||||||||||||||||||||
