Jul 27
barred olivine chondrule ~ looks like a couple of dragonflies to me 💜
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barred olivine chondrule ~ looks like a couple of dragonflies to me 💜
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NWA 869
Afrique du Nord-Ouest 869
Afrique du Nord-Ouest
Trouver : 2000 ou 2001
Chondrite ordinaire (L4–6)
Historique : Il est évident que des collectionneurs de météorites d'Afrique du Nord-Ouest ont découvert un vaste champ de chondrites L dans un lieu tenu secret. Au moins deux tonnes de matériel, comprenant des milliers d'individus, ont été vendues sous le nom de NWA 869 sur les marchés du Maroc et du monde entier. Leurs masses individuelles varient de < 1 g à > 20 kg. Il est certain que NWA 869 est associée à d'autres météorites NWA , bien qu'aucune étude systématique n'ait été réalisée. Il est également possible que certaines pierres vendues sous le nom de NWA 869 ne proviennent pas de la même chute, bien que les revendeurs soient convaincus que la plupart des masses connues se distinguent suffisamment des autres météorites NWA en termes de surface et d'aspect interne pour que le taux d'erreur soit relativement faible. Il est conseillé aux scientifiques de confirmer la classification de tout spécimen obtenu avant de publier leurs résultats sous ce nom.
Pétrographie et géochimie : (A. Rubin, UCLA ) Une brèche fragmentaire de type 4–6 ; une section mince dominée par une lithologie L5 a donné de l'olivine (Fa 24,2 ).
Classification : Chondrite ordinaire (L4–6) ; W 1, S3.
Spécimens : Un spécimen type de 189,3 g est en dépôt à l'UCLA .
Peekskill
SKU: N/A Categories: CHONDRITES, ORDINARY CHONDRITES, Peekskill [H6]
Provenance :
New York, USA
Fell 1992 October 9,19:50 EDT (23:50 GMT)
Ordinary chondrite (H6, monomict breccia)
After a fireball and loud noise a stone fell on Michelle Knapp’s car, parked before her house at 207 Wells Street, Peekskill. A stone of 12,370 g and about 200 g in fragments were recovered. Information, classification and analysis, olivine Fa20, pyroxene Fs17, light, cm-sized H6 clasts in darker H6 matrix, Ignacio Casanova, Department of Geology, Field Museum of Natural History, Roosevelt Road at Lake Shore Drive, Chicago, Illinois 60605-2496, USA. The main mass is in the hand of private collectors: 5.2 kg, Ray Meyer; 1.2 kg, Jim Schwade; 1 kg, Marlin Cilz; 470 g, Field Museum.
Allende
La météorite d'Allende, ou simplement Allende, est la plus grosse météoritechondrite carbonée jamais trouvée sur Terre. Au moment de sa chute le 8 février 1969 dans l'État de Chihuahua au Mexique, elle pesait près de deux tonnes. L'étude des fragments de son champ de dispersion apportant de nombreuses informations sur les premiers temps de la formation du Système solaire fait qu'elle est considérée par les cosmochimistes comme la « pierre de Rosette » de la planétologie tant elle a fourni des informations sur la formation du système solaire.
L'Aigle
Categories:CHONDRITES,l'Aigle [L6],ORDINARY CHONDRITES
One of the most famous historical fall ever ; the fall that was a landmark in the knowledge of the meteorites and their origin.
On April 26, 1803, a meteor rain falls north of the small town of l’Aigle. This is Charles Lambotin, a student of mineralogy and trader of natural history objects in Paris, that wrote the first report about the fall. He published a letter written on May 3 by the citizen Marais, living in l’Aigle, to a friend living in the same building as Mr Lambotin. The friend of Mr. Marais, Mr. Château, had forwarded the letter to Mr Lambotin to alert the Academy of Sciences. Lambotin ordered to start the research north of l’Aigle. At the end of April, his « meteorite hunter » indicated that all the stones had been collected. Lambotin sold in his store many meteorites from l’Aigle to parisian collectors. Then he published the letter in the May-June issue of the Journal of Physics.
During the month of Messidor (July), the citizen Marais drew the first map of the l’Aigle strewnfield but it was too late to publish it. It was made public much later in the first edition of the Dictionary of Natural History (1816-1819) edited by Eugène Patrin. On July 17, 1803 (29 Messidor year 11), Jean-Baptiste Biot read his famous report in front of the members of the Institute of France. This 29 years old scientist was sent in Orne department by the Minister of Interior, Mr Chaptal, to investigate the exceptional fall of meteorites of l’Aigle, 140 kilometers west of Paris. At that time, meteorites theory, at least rocks from space, hardly met followers.
Biot had already defended in the Institute a theory that meteorites were rocks projected by the lunar craters when erupting. Before the wave of rumors triggered by this celestial event, Chaptal therefore took the decision to send Biot in l’Aigle. He went there on June 26, 1803 with a compass, a map of the region (1/86400) and a sample of the meteorite that fell in Barbotan in 1790. He began his study in Alençon then went to l’Aigle, systematically asking to travelers and peasants about the meteorite fall. At l’Aigle, he investigated throughout the region and got many testimonies. This enabled him to draw a map of the elliptical strewnfield. Biot gathered enough evidence of the spatial origin of meteorites.
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Chondrite
Classification non précisée.
Provenance : Ilafegh, Algérie
Achetée au Museum d'histoire naturelle du Luxembourg.
Gao-guenie (H5)
Classification : CHONDRITES, ORDINARY CHONDRITES
Writeup from MB 39:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy.
GAO, a village about 60 km N of the town of Leo, Upper Volta; φ = 11°391N, λ = 2°11’W.
FALL, March 5, 1960, about 1700 hours.
STONY, olivine-bronzite chondrite.
At least 16 stones were recovered, the largest weighing 2.5 kg; 1 kg in U.S. National Museum (Washington, USA).
Writeup from MB 57:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy.
FALL OF THE GUENIE, UPPER VOLTA, STONY METEORITE
Name: GUENIE
Place of fall: Upper Volta
Date of fall: April, 1960.
Class and type: Stone. Olivine-bronzite chondrite (H4). Olivine Fa18-20.
Number of individuals pecimens: A shower, total number not known.
Total weight: Not known, 3.6 kg, four stones, in Paris (Natural History Museum).
Circumstances of fall: Not reported.
Source: M. Bourot et al, 1975. Guenie and Tillaberi: Descriptions of two chondrites fallen in Africa. Meteoritics 10, 368 (abs.). See also M. Bourot, 1976. Etude mineralogique de la meteorite de Guenie. 3rd cycle thesis, University of Paris VI.
Writeup from MB 83:
Gao-Guenie, new name With the recent paper by Bourot-Denise et al. (1998), the Meteorite Nomenclature Committee has decided that a new, collective name, Gao-Guenie, will be bestowed upon all meteorites formerly identified as either Gao (Upper Volta) (frequently truncated to Gao) or Guenie. It had been reported that two meteorite showers occurred one month apart in 1960 in the country now known as Burkina Faso. But the new work confirms long-held suspicions that the two meteorites are indistinguishable from each other and that there was most likely only one fall (1960 March 5). The confusion about this meteorite has been compounded by the fact that new stones continue to be found ~40 years after the fall and are given arbitrarily one or the other name. Henceforth, the official name for all meteorites from this shower will be Gao-Guenie, with the names Gao (Upper Volta) and Guenie as recognized synonyms.
Ma nouvelle beauté, tombée au Canada le 18 janvier 2000.
Il s'agit de la météorite de Tagish Lake, dont 10 kilogrammes ont été récoltés. Il s'agit d'une chondrite carbonée non groupé de type C2, la seule avec Tarda trouvée plus récemment (en 2020 au Maroc). Les spécialistes pensent que ces deux météorites proviennent non pas de la ceinture principale d'astéroïdes mais de la ceinture de Kuiper, en bordure externe du système solaire! Leur intérêt vient également du fait qu'elles sont considérées comme les plus primitives de toutes les météorites.
https://www.lpi.usra.edu/meteor/metbull.php?sea=Tagish+Lake&sfor=names&ants=&nwas=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&strewn=&snew=0&pnt=Normal%20table&code=23782
https://www.futura-sciences.com/sciences/actualites/meteorite-meteorite-tagish-lake-revele-nouveaux-secrets-apparition-vie-19484/
https://www.futura-sciences.com/sciences/actualites/astronomie-meteorite-provenance-ceinture-kuiper-63982/
Categories: CARBONACEOUS CHONDRITES, CHONDRITES, Tagish Lake [C2 ung.]
Those specimens were collected on the ground around the lake in June and July of 2000 by Dan Connelly (a Canadian man). He collected a broken stone and all the little fragments on a beach. The team of Jim Brook knew that stone but they decided to left it there as they prefered to get stones and fragments covered by ice.
Tagish Lake
Canada
Fell january 18, 2000
C2 ungrouped carbonaceous chondrite
Total mass : about 10 kg
The Tagish Lake C2 (ungrouped) carbonaceous chondrite fall of January 18, 2000, delivered about 10 kg of one of the most primitive and physically weak meteorites yet studied. In this paper, we report the detailed circumstances of the fall and the recovery of all documented Tagish Lake fragments from a strewnfield at least 16 km long and 3 to 4 km wide. Nearly 1 kg of “pristine” meteorites were collected one week after the fall before new snow covered the strewnfield; the majority of the recovered mass was collected during the spring melt. Ground eyewitnesses and a variety of instrument-recorded observations of the Tagish Lake fireball provide a refined estimate of the fireball trajectory. From its calculated orbit and its similarity to the remotely sensed properties of the D- and P-class asteroids, the Tagish Lake carbonaceous chondrite apparently represents these outer belt asteroids. The cosmogenic nuclide results and modeled production indicate a prefall radius of 2.1–2.4 m (corresponding to 60–90 tons) consistent with the observed fireball energy release.
More about Tagish Lake : Tarda and Tagish Lake: Samples from the same outer Solar System asteroid and implications for D- and P-type asteroids