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Lunk

Let's See Some Meteorites!

29 posts in this topic

There's not a lot of activity on the meteorite forum, so I thought I'd start a new thread to hopefully jump-start things. It's an invitation for forum members to post pics and/or stories of theirs or others meteorite finds.

When I'm not hunting gold, I'm chasing meteorites. There's nothing quite like finding a rock that is literally out of this world.

For meteorites that I have had classified, I've included links to their entries in the Meteoritical Society's catalog of officially recognized meteorites. They are cold finds; for those not familiar with the terminology, a cold find is newly discovered meteorite that is not part of any known fall or strewn field. So enjoy, and lets see some meteorites!

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https://www.lpi.usra.edu/meteor/metbull.php?sea=Diablo+Pass&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal table&code=35516

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https://www.lpi.usra.edu/meteor/metbull.php?sea=Quartzsite&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal table&code=35634

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https://www.lpi.usra.edu/meteor/metbull.php?sea=Imlay&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=0&pnt=Normal table&code=52855

I'll have more to share later...

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Another cold find from northern Nevada. I was detecting for gold nuggets with my GPX 5000 along a narrow wash that had lots of exposed bedrock. Upon hearing a moderate signal, I looked down and instantly recognized the small meteorite; you'll notice in the pic how it stands out from the surrounding soil and rocks. I'll never have this one classified because it's a complete individual; cutting it would ruin it. 

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nice chrondrites, Lunk...many gold hunters would toss those away.

this is my only Oz meteorite found near Halls Creek and on loan at the Bathurst Observatory, Australia.

fred

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Fred and Lunk,

  Very nice pieces, and finds. I have quite a collection, with a cold find. My largest find is a 17 pound found in Gold Butte, Nevada.

Dave

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Great find, Fred!  Those fine flow features are fantastic...looks like it was oriented. Thanks for sharing. 

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7 minutes ago, DolanDave said:

My largest find is a 17 pound found in Gold Butte, Nevada.

Wow. That's a huge space rock, Dave - congrats! Those others wouldn't happen to be Nininger meteorites in your photo, would they?

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A few years ago I was detecting in the Franconia strewn field in Mohave County, Arizona. Out of the corner of my eye, I spotted a reddish orange rock that stood out in stark contrast from the surrounding light-colored soil. After careful excavation, I was holding the largest meteorite I've found to date. 

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yes, it pays to be specking while detecting...very nice!

fred

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Nice Franconia Lunk....

  Don't those suckers sometimes just stick out like a sore thumb.....

Dave.

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Here are a  few more of the meteorites I've found within the Franconia strewn field.

This is a "puzzle" meteorite; several fragments that fit together. They were all excavated from the same dig hole:

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This beautiful individual stone was hidden in plain sight among some basalt boulders:

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This nifty little chondrite was also nestled between basalt boulders:

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This small individual was found while revisiting an area in the small end of the strewn field, an area that a friend and I first detected for gold nuggets in 1999. We didn't find any gold, but each of us did find a handful of small "hot rocks" that we tossed aside. Had we known then what stony meteorites were, we may have been the first to discover the strewn field:

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    • By Steve Herschbach
      Gold in Meteorites and in the Earth's Crust, U.S.G.S Circular 603 by Robert Sprague Jones, 1968
      Original pdf https://pubs.usgs.gov/circ/1968/0603/report.pdf
      ABSTRACT
      The reported gold contents of meteorites range from 0.0003 to 8.74 parts per million. Gold is siderophilic, and the greatest amounts in meteorites are in the iron phases. Estimates of the gold content of the earth's crust are in the range of 0.001 to 0.006 parts per million.
      INTRODUCTION
      This report is one of several that summarize available data on the occurrence of gold. They have been prepared as background material for the Heavy Metals program of the U.S. Geological Survey, an intensified program of search for new sources of heavy metals, including gold. Data on the occurrence of gold in meteorites and tektites are summarized, and recent estimates of the abundance of gold in the earth's crust are compiled.
      GOLD IN METEORITES
      Table 1 shows reported gold contents of tektites, aerolites, siderolites, and siderites. The table is arranged so that the data on tektites, which have the lowest iron contents, are at the top of the table and the data on siderites, which have the highest iron contents, are at the bottom. The other meteorite groups are intermediate in iron contents except for the siderolites. Gold is most abundant in the siderites and least abundant in the tektites; therefore, meteorites supply good evidence of the siderophilic character of gold. The tektites and the achondrites are relatively low in gold contents and are distinct from the other groups of meteorites in this respect. The gold contents of tektites and achondrites are of the same order of magnitude as those of terrestrial rocks. The other meteorites, on the average, contain appreciably more gold.
      Although the iron contents of meteorites are similar in many respects to those of mafic and ultramafic rocks, the meteorites tend to contain much more gold. In chondrites, the gold seems to be almost entirely in the dispersed metallic phase (Vincent and Crocket, 1960), and this is probably true of the other meteorite. The gold content of the metallic phase of the chondrites is about 1.4 ppm (parts per million), which is similar to the gold contents of siderolites, octahedrites, and ataxites (Vincent and Crocket, 1960; Goldberg and others, 1951).
      The carbonaceous chondrites are primitive, relatively undifferentiated matter from which the other meteoritic types have evolved (Mason, 1962; Baedecker and Ehmann, 1965). The occurrence of gold in such primitive types may be of special interest. The average gold content for 13 carbonaceous chondrites is 0.16 ppm, an amount greater than that in the average terrestrial rock by a ratio of about 40 to 1.
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      The gold contents of the octahedrites do nott seem to vary with the coarseness of the octahedrites. Cobb (1967) noted that most of his valules for gold in meteorites were in the range of 0.2 to 2.5 ppm. Cobb (1967) and Goldberg, Uchiyama, and Brown ( 1951) analyzed parts (three in all) of the same meteorite, and Cobb obtained lower values. The average values of gold in hexahedrites were also low compared with those of Goldberg, Uchiyama, and Brown (1951). For the same 11 meteorites analyzed by neutron-activation methods by Goldberg, Uchiyama, and Brown (1951) and Fouche and Smales (1966), the average contents were 1.1 ppm gold and 0.9 ppm gold, respectively.
      The various types of siderites have differing amounts of gold. Ataxites and octahedrites have an average gold content of ab1ut 1.3 ppm, which is about twice that for hexahedrites (0.64 ppm). The hexahedrites usually have less nickel than either the ataxites or the octahedrites. The Santa Catharina ataxite contained the most nickel ( 38.5 percent) and r.lso the most gold (4.0 ppm), but the Deep Springs ataxite (13.4 percent nickel) contained the least amount of gold (less than 0.1 ppm, but considered as 0.05 ppm for table 1).
      Fouche and Smales (1966) analyzed 70 siderites and found gold contents that ranged from 0.055 to 3.61 ppm. The correlation coefficients between gold and rhenium and between gold and chromium were low and negative, giving values of -0.41 and - 0.31, respectively, but the correlation between gold and arsenic was +0.82 and between gold and palladium +0.68.
      Goldschmidt and Peters (1932) analyzed the Coahuila, Mexico, meteorite and reported that it contained 1 to 5 ppm gold, whereas analysis by the neutron-activation method by Goldberg, Uchiyama, and Brown (1951) gave 0.743 ppm gold; by Fouche and Smales (1966), 0.70 ppm gold; and by Cobb (1967), 0.43 ppm gold. Goldschmidt and Peters (1932), analyzed the Mount Joy, Pa., meteorite and reported that it contained 5 to 10 ppm gold, whereas analysis by the neutron-activation method by Goldberg, Uchiyama, and Brown (1951) gave 0.994 ppm gold. These comparative values along with others in this report seem to indicate that lower values are obtained for gold when neutron-activation methods are used.
      ESTIMATES OF GOLD IN THE EARTH'S CRUST
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      REFERENCES CITED
      Aller, L. H., 1961, The abundance of the elements: New York, Interscience Publishers, 283 p.
      Anderson, J. S., 1945, Chemistry of the earth: Royal Soc. New South Wales Jour. and Proc., v. 76, p. 329-345 .
      Baedecker, P. A., 1967, The distribution of gold and iridium in meteoritic and terrestrial materials: U.S. Atomic Energy Comm. [Pub.] OR0-2670-17, and Ph.D. thesis, Univ. Kentucky, 110 p .
      Baedecker, P. A., and Ehmann, W. D., 1965, The distribution of some noble metals in meteorites and natural materials: Geochim. et Cosmochim. Acta, v. 29, p. 329-342.
      Berg, Georg, 1929, Vorkommen und Geochemie der mineralischen Rohstoffe : Leipzig, 414 p.
      Clarke, F. W., and Washington, H. S., 1924, The composition of the earth's crust: U.S. Geol. Survey Prof. Paper 127, 117 p.
      Cobb, J. C., 1967, A trace-element study of iron meteorites: Jour. Geophys. Research, v. 72, no. 4, p. 1329-1341.
      Crocket, J. H., Keays, R. R., and Hsieh, S., 1967, Precious metal abundances in some carbonaceous and enstatite chondrites: Geochim. et Cosmochim. Acta, v. 31, p. 1615-1623.
      DeGrazia, A. R., and Haskin, Larry, 1964, On the gold content of rocks: Geochim. et Cosmochim. Acta, v. 28, p. 559-564.
      Fersman, A. E., 1933, Geokhimiya, Tom 1: Leningrad, 328 p.
      Fouche, K. F., and Smales, A. A., 1966, The distribution of gold and rhenium in iron meteorites: Chern. Geology, v. 1, no. 4, p. 329-339.
      Goldberg, Edward, Uchiyama, Aiji, and Brown, Harris~n, 1951, The distribution of nickel, cobalt, gallium, palladium, and gold in iron meteorites: Geochim. et Cosmochim. Acta, v. 2, p. 1-25.
      Goldschmidt, V. M., 1934, Drei Vortage uber Geochemie: Geol. Foren. Stockholm For h. v. 56 p. 385-427.
      ---1937, Geochemische Verteilungsgesetze der Elemente. IX. Die Mengenverhaltnisse der Elemente und der Atom-Arten: Norske Vidensk.-Akad. Oslo, Skr., Matematisk-Naturvidenskapelig Kl., 1937, no. 4, 148 p.
      Goldschmidt, V. M., and Peters, Cl., 1932, Zur Geochemie des Edelmetalle: Gesell. Wiss. Gottingen, Nachr., Math.-Phys. Kl., no. 4, p. 377-401.
      Hey, M. H., 1966, Catalogue of meteorites: British Mus. (Nat. History) Pub. 464, 637 p.
      Mason, Brian, 1952, Principles of geochemistry: New York, John Wiley and Sons, 276 p.
      ---1958, Principles of geochemistry [2d ed.] : New York, John Wiley and Sons, 310 p.
      ---1962, Meteorites: New York, Joln Wiley and Sons, 274 p.
      Noddack, Ida, and Noddack, Walter, 1930, Die Haufigkeit der chemischen Elementen: Naturw., v. 18, p. 757-764.
      Parker, R. L., 1967, Composition of the earth's crust: U.S. Geol. Survey Prof. Paper 440-D, 19 p.
      Polanski, Antoni, 1948, A new essay of evaluation of the chemical composition of the earth: Soc. Amis Sci. et Lettres Poznan Bull., Ser. B., v. 9, p. 25-46.
      Rankama, Kalervo, and Sahama, Th. G., 1950, Geochemistry: Chicago, Univ. Chicago Press, 912 p.
      Schneiderhohn, Hans, 1934, Die Ausnutzungsmoglichkeiten der deutschen Erlagerstatter : Metallwirtschaft 13, p. 151-157.
      Shcherbakov, Yu. G., and Perezhogin, G. A., 1964, Geochemistry of gold: Geochemistry Internat., no. 3, p. 489-496.
      Tung, Li, and Chi-Lung, Yio, 1966, The abundance of chemical elements in the earth's crust and its major tectonic units: Scientia Sinica, v. 15, no. 2, p. 258-272.
      Vincent, E. A., and Crocket, J. H., 1960, Studies in the geochemistry of gold. II. The gold content of some basic and ultrabasic rocks and sto:-1e meteorites: Geochim. et Cosmochim. Acta, v. 18, p. 143-148.
      Vinogradov, A. P., 1956, Regularity of distribution of chemical elements in the earth's crust: Geokhimiya, translation, no. 1, p. 1-43.
      ---1962, Average content of chemical elements in the principal types of igneous rocks of the earth's crust: Geokhimiya, translation, no. 7, p. 641-664.
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