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DESCRIPTION
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Here's a superbly formed NICKEL-IRON METEORITE - the material that remains from an interstellar visitor passing through the earth's atmosphere and crashing to earth. Meteorites originate in the heads of comets, the asteroid belt, from Mars, and from the Moon. Iron meteorites are composed of nickel-iron metal. Scientists theorize that they are pieces of the central cores of LARGE ASTEROIDS that once melted and then re-formed. During collision, these asteroids were shattered, sending pieces of their cores hurtling into space, where some of them fell to earth. This meteorite is composed of KAMASITE, or alpha-iron, which typically contain approximately 5% to 7.5% nickel.
This one was found in NAN DAN, QUANXI PROVINCE, CHINA. The Chinese considered meteorites to be sacred stones from heaven. Lihu and Yaozhai towns, Nandan County, Guangxi, China. 25 degrees 6’ N, 107 degree 42’E Nantan iron meteorites represent one of the rare witnessed iron meteorite falls in the world. The fall in 1516 was recorded vividly -- "During summertime in May of Jiajing 11th year, stars fell from the northwest direction, five to six fold long, waving like snakes and dragons. They were as bright as lightning and disappeared in seconds." So far almost all the iron meteorites found in the world are discovered meteorites, that is, no one witnessed any fall. The Nantan is a exception. The Chinese people actually saw the star falling nearly 500 years ago. No one paid attention to the historical record about the fallen stars at Nandan until 1958, when China needed a lot of steel to push the country "Great Leap Forward". During this period, everyone was told to look for iron ore. Even cooking pots were melted in back yards to produce steel. Some farmers at Nandan, mainly Yao minority, were lucky enough to keep their kitchen tools by finding some heavy Iron-rich rocks. Unfortunately, the "iron ore" would not melt at the backyard steel factory, which puzzled the farmers. They reported to the government and scientists. Researchers arrived and proved the "iron ore" to be iron meteorites. Detailed mapping showed that the Nantan meteorites were distributed in an area of 27 - 28 Km long and 8 Km wide, overlying Permian limestone and surface soils. The occurrence of northwestern elongated zone concurs with the historical description of falling direction. Nantan meteorites have different shapes: spherical, triangle, flat-iron shaped, elliptical, semi-sheered, tongue-shaped, irregular, and so on. Fresh meteorite surfaces are black, and commonly characterized with angular or round melted pits. The ones deeply weathered are brown and lack a melted surface. Many Nantan meteorites have been restored (acid cleaning) to a bright finish so that the natural etching is evident and coated to prevent oxidation. The size of Nantan meteorites collected ranges from 1 gram to 2,000 kg. Total weight is estimated to be 9,500 kg. The average chemical composition in the Nantan meteorites are: Fe 92.35%, Ni 6.96%, belonging to IIICD type of iron meteorite based on the taxonomy of Wasson and others (1980). The following trace elements have been detected: C, Cu, Co, S, P, Cr, Ga, Ge, As, Sb, W, Re, Ir, Au, Ru, Pd, Os, Pr, and Mn. Ag, Cd, and Pb isotopes have been analyzed by Prof. Wang Daode and others (1993).
I acquired this meteorite from one of the Chinese dealers who was set up in the wholesale area at the TUCSON GEM & MINERAL SHOW in February. |
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