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Mineral Specimens with Goethite
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8.5 x 7.5 x 3.0 cm. An amazing Arkansas goethite specimen from the Coon Creek Mine. This beautifully iridescent and colorful goethite has botryoidal goethite in parallel bands of black, yellow-green, pink, purple and blue-green. The goethite is on novaculite. Ex. A.L. Kidwell Collection and a note on his label has a 1976 date.
9.9 x 8.2 x 6.2 cm. This amazing Chinese limonite looks like a large mass of Christmas bulbs! Purple, yellow, green, gold - every color you could imagine!
4.6 x 2.8 x 2.4 cm. An unusual combination piece with lustrous botryoidal Goethite coating sharp white Calcites. You can even see the Calcite rhombs outlined in the Goethite. Ex. Willy Israel Collection.
6.5 x 4.6 x 3.5 cm. A very sharp Goethite pseudomorph after the rare mineral Kutnahorite. Ex. Willy Israel Collection.
12.0 x 8.7 x 5.3 cm. This piece features lustrous Goethite in silky-smooth drapery over Calcite rhombohedra, all perched against contrasting matrix of another generation of calcite. The coatings are so sharp, in fact, that the crystal edges of the Calcites below can be clearly followed. Ex. Willy Israel Collection.
7.7 x 4.3 x 2.1 cm. A unique and unusually shaped doubly terminated quartz crystal from recent finds at the Orange River of South Africa. This glassy, highly lustrous, flattened, euhedral crystal is preferentially and dramatically included with rust-red hematite. Ex. Charlie Key.
10.2 x 6.8 x 5.2 cm. This is a very rare and old specimen of Pennsylvania iridescent goethite, with an intense, wet-looking luster and a spectrum of colors. It was in the collection of John Manley back in the 1890s.
14.7 x 3.9 x 2.3 cm. A long (11 cm), slender crystal of gypsum has been entirely replaced by goethite, retaining the form of the gypsum crystal; the center is hollow, and the gypsum appears to be completely gone. This long crystal is attached to a larger, thicker pseudomorph which is presumably of the same origin, with only leafy sheets of goethite remaining.
10.4 x 7.9 x 6.3 cm. An amazing limonite specimen from China. This one displays excellent luster and shimmering green and lavender color.
16.9 x 1.4 x 0.3 cm. A long, slender crystal of gypsum has been entirely replaced by goethite, retaining the form of the gypsum crystal; the center is hollow, and the gypsum appears to be completely gone.
5.9 x 4.6 x 3.8 cm. A fine example of this pseudomorphing phenomenon from Utah, where brown goethite has replaced sharp crystals of pyrite, retaining their form. Ex. Richard Hauck Collection.
11.5 x 2.1 x 1.6 cm. A long, slender crystal of gypsum has been entirely replaced by goethite, retaining the form of the gypsum crystal; the center is hollow, and the gypsum is now completely gone.
17.8 x 1.6 x 0.7 cm. A long, slender crystal of gypsum has been entirely replaced by goethite, retaining the form of the gypsum crystal; the center is hollow, and the gypsum is now completely gone.
14.8 x 8.5 x 3.8 cm. This specimen consists of iridescent goethite, which has formed thin columns made up of little ball-like forms. On top of them are little crystals that were originally labeled as fluorite, but have the wrong form to be that, and appear to be baryte.
9.6 x 8.1 x 5.9 cm. These old pieces came out in the 1970s. This is a really elegant example of the classic form of vanadinite found here, isolated sharp hexagons on contrasting black stalactites. The individual vanadinite crystals reach 5mm in size, typical of this style and association. The matrix is actually goethite.
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Rob Lavinsky, rob@irocks.com
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