Nasza kolekcja meteorytów

NWA 595

Achondryt prymitywny - Brachinit (BRA)

zakupiony w styczniu 2001 roku waga: mikro, 0.5 g
wymiary: 2 x 3 mm
TKW: 196 gr.
One complete stone of a total weight of 196 g was purchased by Cott in Tucson, Arizona, in 2001 January.
Mineralogy and classification (P. Warren, UCLA): mineral mode, 80 vol% olivine, 10–15 vol% orthopyroxene, 5–10 vol% augite and minor chromite, traces include kamacite and Ni-rich metal, no plagioclase was found. Mineral composition, olivine, Fo71–72 and FeO/MnO = 52 ą 6, orthopyroxene, En72–73Fs25–26Wo2.2 and FeO/MnO = 40 ą 7, augite, En45Fs10–11Wo44–45 and FeO/MnO = 32 ą 9, chromite, Cr/(Cr + Al) = 0.77, Mg/(Mg + Fe) = 0.25 and TiO2 = 1.1–1.4 wt%. Typical polygonal-granular texture with a notable alignment of more elongated grains; grain sizes of 0.5 to 1 mm, one exceptionally large grain of 3 mm was observed. Highly weathered, W3/4. Texture, mineral mode and mineral composition of mafic silicates and bulk chemical data are consistent with its classification as brachinite.
All achondrites originated on chondritic bodies that were subjected to some degree of igneous melting and recrystallization. Their parent bodies were large enough to melt and segregate the denser metals from the lighter silicates, generally forming a metallic core, a magnesium-rich mantle, and a calcium-rich crust...The parent body of Brachinites is thought to be Asteroid 289 Nenetta .
Specimens:

• type specimen, 23 g, and thin section, UCLA;;
• main mass, Cottingham

Zakupiony z kolekcji Rosemary Hackney, Fallen Star Meteorites (IMCA 9479) Tennessee, United States, sierpień 2007

#061

NWA 1109

Achondryt HED - Eukryt(EUK)

zakupiony w listopadzie 2001 roku w Erfoud, Maroko waga: mikro, 0.1 g
wymiary: 2 x 3 mm
TKW: 6 kg.
WA 1109.This meteorite is classified as a EUCRITE 3 Polymict Group, < 10% diogenitic - being comprised of crushed up Eucrites and Diogenites and containing bits of other meteorite types. It is basically the soil of an asteroid that has been churned up by meteorite impacts and mixed with them. This meteorite was found in Morocco in 2001 or 2002. This sample was formerly in the Hupe' collection.
Adam and Greg Hupé (Hupé) purchased four stones totalling 2.54 kg from a Moroccan dealer in 2001 October and December, but the total weight of this material including that held by other collectors is estimated to be nearly 6 kg. The stones show distinctive white and grey mineral and lithic clasts in a light tan matrix.
Classification and mineralogy (A. Irving and S. Kuehner, UWS): polycrystalline clasts include basaltic eucrite (ophitic texture, variable grain size, mainly anorthite + pigeonite Wo16Fs57, FeO/MnO = 30); cumulate eucrite (coarse grained, equigranular, mainly anorthite + exsolved pigeonite with accessory silica); rare eucritic breccias and distinctive ferroan intergrowths (fayalite + hedenbergite + silica ą troilite). Mineral clasts include homogeneous pigeonite grains (Wo15Fs31, FeO/MnO = 26), pigeonite grains with clinopyroxene exsolution lamellae (FeO/MnO = 30–33), anorthitic plagioclase (Ab6-Ab10) and a silica polymorph. Accessory minerals in clasts and matrix include ilmenite, Fe metal, chromite, baddeleyite and apatite. Meteoritical Bulletin, no. 87, MAPS 38, A189-A248 (2003)
Specimens:

• type specimen, 20 g, and four polished thin sections, UWS;
• main mass, Hupé.

Zakupiony z kolekcji Rosemary Hackney, Fallen Star Meteorites (IMCA 9479) Tennessee, United States, sierpień 2007

#062

Saratov

Chondryt zwyczajny L4, S2

upadek obserwowany w regionie Saratow, w Rosji (52°33'N, 46°33'E) w 6 września 1918 roku waga: fragment, 0.31 g
wymiary: 2 x 3 mm
TKW: ok 200 kg.

Zakupiony z kolekcji Rosemary Hackney, Fallen Star Meteorites (IMCA 9479) Tennessee, United States, sierpień 2007

#063

New Orleans 2003

Chondryt zwyczajny H5, S1

23 września 2003 roku meteoryt uderzył w dwupiętrowy dom Raya i Judy Faussetów w Nowym Orleanie. waga: fragmenty

TKW: ok 200 kg.
On the afternoon of September 23rd 2003, a meteorite crashed through the two-story home of Ray and Judy Fausset, who were not at home at the time. Neighbors said that they heard a "terrific noise." Two observations of a fireball were recorded. The main mass of the meteorite was found in the crawl space under the house. Powdery meteorite debris and fragments were found along the penetration path throughout the house. A total mass of 19.256 kg was recovered from the Fausset house, the three largest fragments weighing 2966 g, 1292 g and 1001 g. Some additional material (~100 g) was also recovered in the surrounding neighborhood.
Description and classification (S. Nelson, Tulane University; R. Jones and A. Brearley, UNM; T. Bunch and J. Wittke, NAU): The meteorite is light grey with a black fusion crust, and very friable. Abundant metal and troilite are visible on broken surfaces, as well as some thin (mm-thick) impact melt veins.
Classification and mineralogy: The meteorite is very fragmented on a sub-mm scale. Mean compositions of olivine, Fa17.6; orthopyroxene, Fs15.4Wo1.4; clinopyroxene, Fs10.4Wo24.8; plagioclase, An12.8Or5.6; metal, Ni = 6.7 wt %, Co = 0.38 %. Minor chromite and phosphate are present. The meteorite broke a pipe and many fragments sat in water for several days. Because of this and the humid climate in New Orleans, light oxidation of interior metal within small fragments (<100 g) was evident within a week of the fall. Shock level, S1.

Specimens:

• type specimen 82 g UNM
• type specimen 63 g NAU
• main mass with owner.

Zakupiony z kolekcji Rosemary Hackney, Fallen Star Meteorites (IMCA 9479) Tennessee, United States, sierpień 2007

#064

Chinga

Ataxyt IVB

Meteoryt odnaleziony w 1914 roku w Rosji w okolicach rzeki Chinga. wymiary: partslice, 12 X 19 X 27 mm
waga: 25.1g

TKW: ok 209.4 kg.

This is a 25.1 gram polished slice of Chinga Ataxite IVB Meteorite. The size of this specimen is 12 X 19 X 27 mm. This meteorite comes with a Certificate of Authenticity from the Kansas Meteorite Society. It also comes with a Specimen Card. Three sides of this unique piece has been polished to a mirror finish and a very nice fusion crust on 2 sides. The Chinga meteorite was first found in the Chinga River, Tanna Tuva, Tuva Republic, Russia in 1912-1913. In the last few years, meteorite hunters using metal detectors by the riverbeds have recovered several hundred kilograms. Classified as an ataxite IVB, this meteorite has a high nickel content (15.7-18%). Despite a terrestrial age of more than 2000 years and having landed in a riverbed, the fragments are for the most part very nice, thank you nickel. As found they have a nice thin layer of rust. V. Grokhovsky wrote, "The microstructure of the Chinga meteorite is plessite-like kamacite-taenite intergrowing, separated kamacite spindels and rare crystals of troilite, daubreelite and chreibersite." A microprobe study on a tridymite silicate inclusion showed that the composition of the silicate to match that the IVA class of iron, with a tendency to the low silicate bearing octahedrites Gibeon and Bishop Canyon. Being an ataxite it does not give you the beautiful etch that a meteorite such as Gibeon does. Because of this, most slices are just polished to a mirror finish. The meteorite is highly shocked from cosmic impacts. In Russia, the meteorite is spelled Chinge.

Zakupiony z kolekcji Roberta Barratti, Wichita, Kansas, United States, wrzesień 2007

#065

Isheyevo

CB3(b) chondryt węglisty, benkubbinit S1 W1

Meteoryt odnaleziony w 2003 roku w Rosji w regionie Baszkortostanu (53°37'N, 56°20'E) wymiary: slice, 9 x 8 x 2 mm
waga: 0,21g

TKW: ok 16 kg.

One stone, weighing 16 kg, was found by a tractor driver in a field during harvest carrying in the Ishimbai region of Bashkortostan, close to the Isheyevo village. A small piece of the meteorite was issued to the Vernadsky Institute by Kazakov D.A., and Polozkov A.G, September 2004.
Mineralogy and classification (Ivanova M.A. Vernad., Ulianov A.A. MSUM). Fusion crust is well developed, dark brown. The meteorite consists of FeNi metal grains, C, POP, rare BO chondrules (0.02-1 mm in size), chondrule fragments, CAIs, and matrix lumps. FeNi metal comprises from 50 to 70 vol%, and contains 4.2-8.4 wt% Ni, 0.2-0.5 wt% Co, and 0.03-0.6 wt% Cr; Co/Ni ratio is approximately solar. C chondrules don’t contain any FeNi metal grains, they are Mg-rich, and consist of pyroxene-rich cryptocrystalline material. Olivine, Fa2.5, rare FeO-rich olivines, Fa10-38 ; pyroxene, Fs2.1Wo1.7, FeO-rich pyroxene, Fs8-12Wo0.8-1.8; troilite is Cr-rich, 2.5 wt% Cr. INAA data for a 20 mg chip: 2.74 wt.% Ni; 717 ppm Co; 2608 ppm Cr, 8.2 ppm Sc, and 1.59 ppm Ir.
Petrological type 3; shock stage, S1; weathering grade, W1.
Specimens:

• a type specimen, 24.3 g, and two sections, Vernad;
• main mass with anonymous finder.

Zakupiony z kolekcji Yulia Grozman (cometshop), Orinda, CA, United States, 10/2007

#066

Dhofar 312

achondryt prymitywny, akapulkoit (ACAP)

Meteoryt odnaleziony w 11 stycznia 2001 roku w okoliach Dhofaru, w Omanie (18°59.3' N, 54°36.3' E) wymiary: slice, 29 x 9 x 2 mm
waga: 0,3g

TKW: 0.354 kg.

A 354 g stone without fusion crust was found in the desert.
Mineralogy and classification (D. Badjukov and C. Lorenz, Vernad; F. Brandstätter, NHMV): consists mostly of euhedral silicate grains (0.05.0.4 mm) with interstices filled by Ni-containing iron oxides; approximate mineral modes (vol%) are low-Ca pyroxene = 35, olivine = 25, plagioclase = 15, augite = 5, opaques = 5 (chromite and rare inclusions of troilite and metal in silicates), terrestrial weathering products = 15, accessory chlorapatite; olivine, Fa8.6ą0.5; orthopyroxene, Fs7.6ą0.4 Wo1.8ą0.2; augite Fs3.4ą0.5 Wo40.2ą2, containing 1.5 wt% Cr2O3; plagioclase, An15.8ą1.4 Ab81.5ą2.7 Or2.6ą0.3; many pyroxene and olivine grains contain rounded inclusions (1.20 ľm) of troilite, kamacite (6 wt% Ni), and rare taenite (26 wt% Ni); low shock stage; weathering grade, W3. Dhofar 312 may be paired with Dhofar 125.
Specimens:

• type specimen, 70 g and thin section, Vernad;
• main mass with anonymous finder.

Zakupiony z kolekcji Yulia Grozman (cometshop), Orinda, CA, United States, 10/2007

#067