Banded Iron Formation (BIF) with Hematite

objekte/banded iron formation bif with hematite accqYh2 633219375 / Zum Verkauf

objekte/banded iron formation bif with hematite accqYh2 633219375

Zum VerkaufAuktionsergebnisse

objekte/banded iron formation bif with hematite accqYh2 633219375

Zum VerkaufAuktionsergebnisse

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Banded Iron Formation (BIF) with Hematite

Tiger Iron sphere specimen, with Hematite, Tiger's Eye, and Jasper — This meticulously crafted specimen presents as a Tiger Iron sphere, geologically defined as a Stratified Iron Formation (BIF), of notable quality and finish. BIFs are metamorphosed sedimentary rocks composed of thin alternating bands of iron oxides (hematite and magnetite) and silica (cryptocrystalline quartz such as jasper or chalcedony). This distinctive stratification results from primordial sedimentary and oxygenation processes that occurred about 2.5 billion years ago, during the Archean–Proterozoic, testifying to ancient oceanic environmental fluctuations and the emergence of photosynthetic organisms. Visual analysis of the sphere reveals a rich and varied color palette. Dominant are deep rust and reddish-brown tones of hematite, alternating with silky layers of golden-bronze tiger's eye, which exhibit a pronounced chatoyancy under direct lighting. Bands of red and yellow jasper are also present, adding further chromatic and textural contrasts. The impeccable surface polish enhances the silky luster of the tiger's eye and the sub-metallic sheen of hematite, highlighting the microcrystallinity of quartzite and the micro-granularity of iron oxides. Provenance from deposits of Stratified Iron Formations of Western Australia, particularly from regions such as the Hamersley Basin, is an indicator of its primary geological origin and great antiquity. These formations are among the most extensive and ancient on the planet, representing geochemical archives of distant eras when Earth's atmosphere was still oxygenating. Their composition and banded structure make them objects of significant mineralogical and petrological study. The exceptional aesthetic quality of this sphere is evident in the vivid colors, harmonious banding, and high-level finish. The spherical shape, achieved through careful lapidary work, accentuates the complex internal tessellation, allowing observation of unique patterns that may include concentric ‘eyes’ or ‘waves,’ depending on the orientation of the cut relative to the original mineral bands. Such features make every Tiger Iron sphere a singular specimen, a true natural and geological work of art. The preservation state is optimal, free of fractures or significant imperfections that could mar the glossy surface or compromise structural integrity. The precision of the workmanship and polishing is such as to maximize the perception of the chatoyancy effect and the depth of colors. This specimen does not require any specific support for display, though an appropriate pedestal enhances its spherical form and facilitates rotation to appreciate all sides. From a collector’s standpoint, a Tiger Iron sphere of this size and quality, originating from a historic deposit like the Australian one, represents a valuable addition to any mineralogical or lapidary collection. Its mineralogical complexity, deep geological genesis, and intrinsic beauty make it a subject of study for geologists and a piece of natural art for connoisseurs, placing it favorably compared to lower-quality specimens or those with less well-documented provenance.

Schätzpreis:€250

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