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Mineral Specimens with Goethite
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18.9 x 5.4 x 3.8 cm. From an incredible recent find, this amazingly iridescent and colorful goethite, which formed stalactitically, has botryoidal form on the surface which reflects its pink, red, gold, orange and other colors in every direction. Goethite is usually such a boring mineral, but now and then, as here, it can be incredibly bright and lustrous. An uncommonly colorful and beautiful form of a common mineral, here in a showy, large size.
11.4 x 6.8 x 5.8 cm. This is an old-time specimen from Santa Eulalia, and truly an unusual combination to see. Pearly hemimorphites have grown on a micro-stalactitic, and in places iridescent, goethite.
4.5 x 3.4 x 2.3 cm. A bizarre and not so ugly pseudomorph for a brown on white mineral specimen. A sharp, disc-shaped, 3.5-cm calcite has here been completely replaced by goethite, which preserved the original form perfectly. Aesthetic. Ex. Charlie Key.
3.4 x 2.9 x 2.9 cm. A fascinating floater specimen of goethite that has replaced (pseudomorphed) a spiky ball of crystallized marcasite retaining its crystal form perfectly. The triangular form is repeated in small sub-faces all over the crystals. Beautiful specimens from the Egyptian desert. Now, I am told it is too dangerous to go get these, near the border with Libya.
8.8 x 8.2 x 4.4 cm. Goethite takes on such a huge variety of forms - often really strange, as here, where it has pseudomorphed underlying crystals of selenite. The form of the selenite blades, which are no longer extant (you can clearly see their hollow imprints underneath) have been perfectly preserved by the dark goethite, which would have been totally amorphous but for its deposition on these euhedral crystals. Ex. Jaime Bird Collection.
2.9 x 2.3 x 2.2 cm. This area is obviously well known for its Amazonite specimens, but it also produces some superb quality Goethite specimens. At times, these Goethite "balls" are found overgrowing the terminations of Smoky Quartz crystals. This piece features a beautiful, semi-lustrous dark golden-brown spherical aggregate of Goethite perched atop a gemmy prismatic crystal of Quartz (var: Smoky Quartz). Ex. Jaime Bird Collection.
5.3 x 4.2 x 3.6 cm. This is a superb specimen of iridescent limonite from China. It is much more colorful and lustrous in person. It shimmers with an amazing spectral array of colors that look almost unreal.
9.0 x 4.0 x 3.4 cm. From an incredible recent find. This amazingly iridescent and colorful goethite, which formed stalactitically, has botryoidal form on the surface which reflects its pink, red, gold, orange and other colors in every direction.
15.0 x 9.6 x 4.8 cm. A striking, two-sided, large cabinet specimen of iridescent, botryoidal limonite. It is much more colorful and lustrous in person. It shimmers with an amazing spectral array of colors that look almost unreal. This is a large specimen, too.
4.8 x 3.8 x 3.4 cm. From an incredible recent find: This superbly iridescent and colorful goethite, which formed stalactitically, has botryoidal form on the surface which reflects its pink, red, gold, orange and other colors in every direction. Even the black goethite botryoids are silvery bright.
10.8 x 8.1 x 4.7 cm. A beautiful, jet-black cluster of botryoidal goethite that almost completely drapes a core rock matrix. This is likely a very old specimen, and comes from a long defunct locale. It is, for a black mineral, really attractive. The piece is complete on the display face and has just a few breaks to the surface on the backside. It was last in the Ed David Collection (Ed was a director of the White House Office of Science and Technology and a former science advisor to President Nixon). Ed obtained it from the Uli Burchard collection.
8.7 x 5.9 x 3.9 cm. From an incredible recent find, this beautifully iridescent and colorful goethite, which formed stalactitically, has botryoidal form on the surface which reflects its pink, red, gold, orange and other colors in every direction. Even the black goethite botryoids are silvery bright. An uncommonly colorful and beautiful form of a common mineral.
11.4 x 3.8 x 3.4 cm. From an incredible recent find, this amazingly iridescent and colorful goethite, which formed stalactitically, has botryoidal form on the surface which reflects its pink, red, gold, orange and other colors in every direction. Even the black goethite botryoids are silvery bright.
10.9 x 8.9 x 6.9 cm. A striking, two-sided, cabinet specimen of iridescent, botryoidal limonite. It shimmers with an amazing spectral array of colors that look almost unreal. This is a large one, too.
2.2 x 2.1 x 2.1 cm. An excellent and aesthetic vanadinite thumbnail from the much less well-known and productive Taouz area of Morocco. Two vanadinite crystal habits are shown on the lustrous, vermillion-colored crystals: fans of flattened, tabular, hexagonal crystals in parallel-growth beautifully crown the piece; and two, blocky, hoppered, hexgonal crystals sit isolated, at the base. These specimens came out in the early-mid 1980s, with none since. The very complimentary botryoidal matrix is unique to Taouz vanadinites and is not found on Mibladen vanadinites. It was originally called hollandite, but has been found to be goethite. Highly representative of this limited find. Ex. Jaime Bird Collection.
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Rob Lavinsky, rob@irocks.com
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