selections from the RICHARD HECK MEXICO COLLECTION

selections from the
RICHARD HECK
MEXICO COLLECTION

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HECK-217 - Calcite with Mimetite - $ 2000
Santa Eulalia Dist., Serdan, Chihuahua, Mexico
cabinet, 11.4 x 11.1 x 6.9 cm

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ex. Richard Heck

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We have seen many mimetites from this locale, and many calcites, but I cannot recall seeing such a combination piece with large robust calcites sprouting like mushrooms atop. From the bottom, you can see that the mimetite encrusts a calcite stalactite, and then the large calcites atop came later. The whole specimen exhibits a tree-like or mushroom pattern. The mimetite at the base of the piece is sparkly and bright goldenrod-yellow, not the brown color as are so many mimetites from this locality. Complete all around.

HECK-216 - Calcite with Galena & Chalcopyrite - $ 1500
Naica, Chihuahua, Mexico
cabinet, 13.8 x 8.2 x 7.2 cm

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A gorgeous specimen of unusually large rhombohedral calcite festooned with sparkles! The ivory colored, large rhombohedrons fluoresce a light orange color, and are encrusted with splendent and bright crystals of galena, to 5 mm across. Bright, metallic, brassy yellow chalcopyrite crystals, to 6 mm across, are scattered about on the galena for accent. Overall a very unusual specimen with lots of eye appeal, yet a simple form overall.

HECK-215 - Smithsonite - $ 2500
Esmerelda, Sierra Mojada Coahuila, Mexico
large cabinet, 16.5 x 12.0 x 8.9 cm

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ex. Richard Heck

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A solid botryoidal crust of translucent, pastel-green smithsonite with satiny luster has completely flowed over and overgrown its matrix. I particularly like the way the smithsonite is folded over the matrix, tucked in around the edges. This is an impressive smithsonite specimen from a fairly obscure mine from which I have not had specimens before. The color is very unique as well, a pastel daiquiri hue more than anything i would normally call blue-green, though it does have a tint of blue to it. The piece is remarkably pristine all around, except for a slight contact or impact on the top that produced some internal cracking in a very small spot, though not a break per se. It weighs in at nearly 4 pounds!

HECK-213 - Calcite on Stilbite - $ 1250
San Luis Potosi, Charcas, Mexico
large cabinet, 18.3 x 11.1 x 6.5 cm

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ex. David Stoudt

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Intergrown, slender, tabular, translucent, snow-white calcite crystals to 6 cm across are dramatic enough, for most people. Here we have those flat, sharp discs perched on sparkling orange spheres of stilbite, to 7 mm across that form a matrix under the calcites. The calcite fluoresces a light pinkish orange color...Very pretty! I have seen only a VERY few stilbites from this locality, said to be quite old. This one turned up in an old collection in california in 2003, and I then sold it into the Stoudt collection of Mexican minerals. Although not in the Heck collection of Mexican minerals as are most others in this update, this piece is from the Stoudt collection which I also recently acquired, and so fit well with the larger update

HECK-212 - Calcite (twinned) on Quartz - $ 1250
Santa Eulalia Dist., Serdan, Chihuahua, Mexico
cabinet, 12.6 x 9.8 x 6.2 cm

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Aesthetically emplaced on a matrix of massive calcite along with colorless, translucent quartz crystals, to 2 cm in length, are three fat, twinned, frosted and translucent calcite rhombs, to 7.5 cm in length. They are secondary overgrowths on existing smaller calcite rhombs.The overgrowths fluoresce a vivid orange color due to slight manganese content. A wonderful and captivating calcite from Santa Eulalia, of classic habit but in a very large and fine specimen. Complete all around, though sawed on bottom to stand up straight.

HECK-211 - Quartz - $ 900
Santa Eulalia Dist., Serdan, Chihuahua, Mexico
small cabinet, 9.8 x 8.0 x 5.1 cm

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Just quartz! But, somehow, this piece has a unique elegance to it. It is a cluster of several, lustrous and gemmy, colorless, quartz crystals, to 9.8 cm in length, along with a few spiky, horizontal quartz crystals.The crystals all terminate in triangle-shaped faces, a few of which exhibit skeletal or hopper growth. Overall, it is 3-dimensional and sparkling. A small hint of hematite, of iron staining, lends subtle color to some outlying crystals.

HECK-210 - Arsenopyrite - $ 600
San Antonio Mine, East Camp, Santa Eulalia Dist., Serdan, Chihuahua, Mexico
cabinet, 14.9 x 8.3 x 6.1 cm

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ex. David Stoudt

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Emplaced on limestone matrix and totally covering the surface are sharp, intergrown splendent, silver gray crysyals of arsenopyrite, to 2 cm across. A few, colorless, lustrous and translucent quartz crystals, to 3 cm in length poke through the mass of arsenopyrite crystals. Beautiful large plate. Although not in the Heck collection of Mexican minerals as are most others in this update, this piece is from the Stoudt collection which I also recently acquired, and so fit well with the larger update

HECK-208 - Chalcopyrite - $ 2000
Mina Maria, Cananea, Sonora, Mexico
cabinet, 11.9 x 9.1 x 6.7 cm

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This solid mass of splendent, brassy yellow chalcopyrite crystals, to 1.5 cm across, is associated with drusy, white calcite. This is a very dramatic and sparkling specimen with incredibly bright luster and incredibly brassy, metallic crystals. It is much better in person, even, and just dazzles in a showcase with light on it.

HECK-207 - Adamite var. Manganoan on Goethite - $ 4500
Ojuela Mine, Mapimi, Durango, Mexico
cabinet, 13.4 x 9.5 x 4.7 cm

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A botryoidal crust of brownish-black goethite is host to a large, aesthetic cluster of lustrous and translucent, bi-colored mangan adamite crystals, to aVERY LARGE SIZE of 3.5 cm in length. The lower 80% of the crystals are ivory-colored while the gemmier terminations exhibit a lovely, light lavender color. This is one of the largest clusters of manganoan adamite I have seen from the incredible finds at Mina Ojuela in 1981-2. Although the color is not intense, it is present, and in this case it is present as an accent to the overall form and richness of the piece, lending purple highlights to unsuual white crystals. The crystals are sinuous and interesting, in and of their own. The contrast of the curving crystals which are sharply pointed on either end, with the rolling black hills of geothite matrix, really adds a lot to the specimen

HECK-205 - Pyrrhotite stalactite with Siderite - $ 1500
Potosi Mine, Santa Eulalia, Chihuahua, Mexico
cabinet, 12.9 x 3.0 x 2.6 cm

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This is a truly unique specimen in our experience! It is a sinuous stalactite composed of lustrous, light brown, crystals of pyrrhotite, to 2 cm in length , which are partially covered on one side by sparkling tan rosettes of siderite to 5 mm across. At one time, Martin Zinn had the finest stalactite collection I ever saw. This specimen would have been worthy of that collection, or any Mexican minerals or sulfides collection.

HECK-204 - Galena (Twinned) - $ 1250
Naica, Chihuahua, Mexico
small cabinet, 9.5 x 8.3 x 5.7 cm

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ex. Richard Heck

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Robust, spinel-twinned, metallic galena crystals, to 5 cm across , form a citylike mass atop this specimen. I particularly like the way all the crystals on the display side are individual and discrete in how they present to the viewer, making the piece look complex but not jumbly, as most do. The crystals show, in the right lighting, a shine of iridescent patina. BETTER IN PERSON!

HECK-203 - Arsenopyrite on Sphalerite - $ 1200
Parral, Chihuahua, Mexico
cabinet, 10.9 x 8.0 x 7.4 cm

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ex. Dr. Eugene Meieran

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A very lustrous, yellowish-metallic crystal of arsenopyrite, measuring 4 cm across, is accompanied by smaller crystals of the same species along with a few large black crystals of sphalerite, to 6 cm across. A druse of grayish calcite crystals is present, mostly on the back side of the specimen. Overall an interesting combination piece that I am todl is a very odd association and style for the mine. The arsenopyrite alone, without the associations, would be easily thought to be from Panasquiera by most people. It is more robust than most Mexican arsenopyrites, and does not have the usual "sharp" chisel-like termination. Although not in the Heck collection of Mexican minerals, this piece fit well with the update and is included. It was long in the collection of noted collector and dealer Gary Hansen. He sold it at some point to collector Gene Meieran, who today is known for his big gem crystals but used to have a very large and diverse suite of sulfide species. When his sulfides collection sold to me in about 2005, the piece went next to Mexico & Arizona-collecting specialist David Stoudt, from whom I obtained it back by exchange recently.

HECK-202 - Pyrite - $ 1000
Cananea, Sonora, Mexico
small cabinet, 6.6 x 6.6 x 5.7 cm

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ex. Richard Heck

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This is a large, well formed, splendent, brassy yellow, cuboctahedron of pyrite. Very minor edgewear is of little consequence visually, though it is present. This is an important historical locality for many species, including such sharp pyrite crystals which were once considered among the most desirable on a worldwide basis. This is a particularly impressive single crystal , for sharpness and symmetry, for Mexico

HECK-201 - Galena ps. After Pyrrhotite, on Galena (ex. Swoboda) - $ 1000
Naica, Chihuahua, Mexico
small cabinet, 9.3 x 8.9 x 7.2 cm

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ex. Edward Swoboda

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The highlight of this specimen is the series of parallel growth, disc-shaped galena crystals, to 6 cm across. They are replacements (pseudomorphs) of pyrrhotite, by galena. Each of the larger galena crystals is backed by sugary, white calcite making an interesting color contrast between the two species. All of this is emplaced on a matrix of smaller galenas of normal habit, atop light green fluorite. Although not in the Heck collection of Mexican minerals, this piece fit well with the update and is included. It was long in the collection of noted california collector Ed Swoboda, who specialized in pseudomorphs. When his collection sold to Carter Rich in the mid 1990s, the piece went next to Dr. Ed David. I got it from Ed in a deal in about 2002, and sold it to Mexico & Arizona-collecting specialist David Stoudt, from whom I obtained it back by exchange recently.

HECK-200 - Calcite (twinned) - $ 2000
Noche Buena Mine, Mazapil, Zacatecas, Mexico
small cabinet, 7.6 x 6.6 x 5.5 cm

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Emplaced on matrix are several SHARP, waxy and translucent, tan-colored, calcite rhombs to 4.5 cm across. This specimen is special because it appears to feature two separate laws of twinning, penetration and rotational. In addition to the twinning, this unusual calcite specimen also appears to be pristine. The multiple penetrations and sharp resulting form of these crystals is nearly unique, and I recall this find coming to market in the late 1980s - and then nothing else afterwards of the same style. Overall, the piece is very 3-dimensional and well balanced, in line with Richard Heck's consummate taste in mineral specimens

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Rob Lavinsky, rob@irocks.com

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