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NEA (North East Africa) 001, Sudan

Regolit księżycowy - Anortosytowa Brekcja Regolitowa

waga:micro
wymiary: 2 x 1 mm
TKW: 262 g
Odnaleziony w kwietniu 2002
Biuletyn Meteorytowy: 89

A brownish gray stone weighing 262 g was found by a prospector in northern Sudan near the Libya/Egypt/Sudan boundary in 2002 April. Fusion crust is absent, fresh surface is gray to dark gray, and terrestrial alteration products are present at the meteorite edges and in penetrating cracks and veins. Classification and mineralogy (J. Haloda and P. Tycova, PCU): a clast-rich anorthositic regolith breccia containing numerous mineral fragments and lithic clasts embedded in a well-consolidated microcrystalline impact melt matrix. Lithic clasts (up to 1 cm in size) are mainly of anorthositic lithologies; impact-melt breccias of anorthositic composition are abundant and show commonly breccia-in-breccia textures. Fragments of primary igneous rocks of anorthositic to gabbroic composition are common, containing plagioclase An95.1-97.2, low-Ca pyroxene En46-65 Wo2.1-5 and high-Ca pyroxene En35-48Wo37-44 and rare olivine Fo79.4. Sparse clasts of mare basalts (consisting of pigeonite+anorthite+accessory ilmenite), and glass fragments and spherules are present. Mineral fragments are of various composition: feldspar, An92-99; orthopyroxene, Wo2-4En49-80; clinopyroxene, Wo9-39En50-87; olivine, Fo48-82 (Fe/Mn 93-100 atom%); accessory minerals are Mg-Al spinel, chromite, ilmenite (2-5 wt% MgO), troilite, FeNi metal and silica. Several pyroxene grains have marginal symplectitic intergrowths of fayalite+hedenbergite+silica after former pyroxferroite. Composition of the impact-melt matrix is (wt%): SiO2 = 45.7, Al2O3 = 24.1, FeO = 7.2, MgO = 7.4, CaO = 14.6, Na2O = 0.5, TiO2 = 0.5. Secondary calcite, barite, gypsum and Fe hydroxides occur in cracks. Specimens: type specimen, 20 g, and one polished thin section, PCU; 5.8 g, and one polished thin section, UWS; 59.66 g, ROM; 60 g, Hupé; 9.7 g, Gregory; main mass with finder.

Zakupiony z kolekcji Kerry Palmera, Poole UK, 2007

#021

NWA (North West Africa) 2696 Provisional, Maroko

Achondryt zwyczajny, Howardyt

waga:0,1g ps
wymiary: 5 x 5 x 2 mm
TKW: 6572 g
Odnaleziony w kwietniu 2004
Biuletyn Meteorytowy: niepublikowany

Sparowany z NWA 1929 (TKW 922g). Publikacja w biuletynie meteorytowym nr 90: Informacje poniżej dotyczą NWA1929:
Find: May 2003, Morocco
Achondrite (howardite)
History: A 922.2 g, partially crusted, complete stone was purchased in Erfoud, Morocco, in May 2003.
Petrography: (T. Bunch and J. Wittke, NAU ) A breccia of 72 vol% cumulate eucrite clasts, 8% subophitic clasts, 14% diogenites, and 6% melt clasts. Pervasive solid-state recrystallization of plagioclase and pyroxenes with localized melt pockets and veins in clasts.
Geochemistry: Coarse-grained gabbroic eucrite: Pyroxene (Fs45–40Wo7–20); plagioclase (An91.2–95.3); metal (Ni = 0.97; Cr = 0.87 [both wt%]). Diogenite: Pyroxene (Fs43–54Wo2.5–3.6; Fe/Mn = 36, 37).
Classification: Achondrite (howardite); high shock.
Specimens: A 22.02 g type specimen is on deposit at NAU. Farmer holds the main mass.

Zakupiony z kolekcji Kerry Palmera, Poole UK, 2007

#022

Gibeon, Namibia

Meteoryt żelazny, Typ IVA oktahedryt drobnoziarnisty

waga:3,86g ps
wymiary: 12 x 8 x 3 mm
TKW: 34,7 kg
Odnaleziony w 1836 roku w Namaland, Namibia 25°30'S, 18°0'E
Biuletyn Meteorytowy: 36

DISCOVERY OF NICO IRON METEORITE, SOUTH WEST AFRICA
Name: NICO.
The place of fall or discovery: The farm of Nico near the railroad station of Asab, South West Africa; 25°23' S, 17°47" E.
Date of fall or discovery: FOUND, 1965.
Class and type: IRON.
Number of individual specimens: 1.
Total weight: 25.2 kg and 9.5 kg .
Circumstances of the fall or discovery: The meteorite was found by the aborigens probably on the site of the fall.
Source: Report of Dr. J. Zabringer (Heidelberg, Germany) in a letter, March 1, 1966.

Zakupiony z kolekcji Kerry Palmera, Poole UK, 2007

#023

Tektyt libijski

tektyt typu Muong Gong

waga: 6,39g fs
wymiary: 29x19x13 mm
Libia

Tektyt libijski klasyfikowany jako Muong Nong o wadze 6,39 g jest bardzo rzadkim rodzajem tektytu. Ponieważ tektyty te nie wykazują oznak aerodynamicznego kształtowania uważa się, że powstały w wyniku udarowego warstwoego przetopienia w wyniku impaktu meteorytowego ok 28,5 mln lat.

Zakupiony z kolekcji Wong Chi Sum Raphael, Hong Kong, 2007

#024

NWA (North West Africa) 2696 Provisional, Maroko

Achondryt zwyczajny, Howardyt

waga:0,12g ps
wymiary: 5 x 6 x 2 mm
TKW: 6572 g
Odnaleziony w kwietniu 2004
Biuletyn Meteorytowy: niepublikowany

Sparowany z NWA 1929 (TKW 922g). Publikacja w biuletynie meteorytowym nr 90: Informacje poniżej dotyczą NWA1929:
Find: May 2003, Morocco
Achondrite (howardite)
History: A 922.2 g, partially crusted, complete stone was purchased in Erfoud, Morocco, in May 2003.
Petrography: (T. Bunch and J. Wittke, NAU ) A breccia of 72 vol% cumulate eucrite clasts, 8% subophitic clasts, 14% diogenites, and 6% melt clasts. Pervasive solid-state recrystallization of plagioclase and pyroxenes with localized melt pockets and veins in clasts.
Geochemistry: Coarse-grained gabbroic eucrite: Pyroxene (Fs45–40Wo7–20); plagioclase (An91.2–95.3); metal (Ni = 0.97; Cr = 0.87 [both wt%]). Diogenite: Pyroxene (Fs43–54Wo2.5–3.6; Fe/Mn = 36, 37).
Classification: Achondrite (howardite); high shock.
Specimens: A 22.02 g type specimen is on deposit at NAU. Farmer holds the main mass.

Zakupiony z kolekcji Kerry Palmera, Poole UK, 2007

#025

BRENHAM HAVILAND

Pallasyt grupy głównej (MGP) lub pallasyt-anom

waga: płytka polerowana, 10.35 g
wymiary: 38 x 28 x 3 mm
TKW: ok 7-8 ton g
Pochodzenie: Kiowa County, Kansas, USA 37°35.16'N, 99°10.012W
W lutym 1886 roku Frank i Eliza Kimberly przenieśli się na nowo zakupioną działkę o okręgu Kiowa, gdzie wkrótce pani Kimberly odkryła czarne, ciężkie skały. Domyśliła się, że mogą to być meteoryty, jednak dopiero w 1890 roku podejrzenia te zostały potwierdzone przez naukowców z Washburn College in Topeka. Sądzi się, że meteoryt Brenham powstał około 4.6 miliarda lat temu w strefie granicznej między jądrem a skorupą asteroidy o średnicy około 400 km na głębokości około 90 km. 156 milionów lat temu zderzenie z innym obiektem wyrwało 6 metrowy, ważący 500 ton fragment, który dotarł na Ziemię w okresie ostatniech zlodowacenia - ok 20 tysięcy lat temu. Upadek utworzył pole rozrzutu o długości 10 i szerokości półtora kilometra oraz mierzący 17 x 11 i głęboki na 3 metry krater Haviland odkryty w 1933 przez Dr. H.H.Niningera.

Zakupiony z kolekcji Donalda I. Stimpsona, 2/14/2007

#026

NWA 482

Brekcja księżycowa, LUN-A, wyżynna brekcja impaktytowa

waga: micro 0,04g
wymiary: micro
pochodzenie: Alnif, Algieria
TKW: 1015 g
NWA 482 is a 4.5 billion year old Very Rare Lunar Highlands Impact Melt Breccia (IMB). NWA 482 is the most popular and is considered by the majority to be the most beautiful Lunaite ever found. NWA 482 is the freshest lunar meteorite in existence and is believed to have originated from the far side of the moon. A Total Known Weight (TKW) of 1,015 grams is recorded for this awesome find brought out of the Saharan desert back in 2001.

History: A 1015 g stone was purchased on 2001 January 10 in Alnif, Morocco, by Michael Farmer. The exact location of find is unknown but it is possibly in Algeria. The stone is complete, oriented, and appears relatively unweathered.

Classification and mineralogy (A. Rubin and P. Warren, UCLA; D. Kring and I. Daubar, UAz): texture is typical of a crystalline impact melt breccia (polymict) with highland affinities; glassy and vesicular melt veins and melt pockets indicate shock subsequent to compaction by an impact event; plagioclase, An95.7Ab4.09Or0.17 (n = 136, UAz); olivine, Fo65–68 (average Fo66) with FeO/MnO = 88 ą 7 g/g (UCLA); olivine Fo68.4 with FeO/MnO = 93.9 ą 7.7 g/g (range: 78.7 to 111) (n = 51, UAz); pyroxene, Fs25Wo17 with nearly uniform Mg/(Mg + Fe) = 67–68 mol% and FeO/MnO = 51 ą 6 g/g (n = 10, UCLA); pyroxene, Wo10.3–51En32.6–63.9 Fs42.6–14.2, mean Mg/(Mg + Fe) = 68 mol%, FeO/MnO = 52 ą 8 g/g (n = 28, UAz); glassy melt veins occur in both UCLA and UAz samples; a 0.1 mm vein (UCLA) has SiO2 = 44.3 wt%, Na2O = 0.3 wt%, Al2O3 = 30.0 wt%, FeO = 3.6 wt%, MgO = 3.9 wt%, CaO = 17.3 wt%, and TiO2 = 0.3 wt%, which may approximate the bulk meteorite composition.

Specimens: half of the main mass is with Farmer; 74 g, DPitt; type specimens, 24 g, UCLA, and 18 g, UAz.

Zakupiony z kolekcji Hupé Planetary Collectio, USA, 2007

#027

NWA 1277 (provisional)

Ornan CO3 lub CO3.6 - Chondryt węglisty

waga: płytka 0,84g
wymiary: 7 x 8 x 3 mm
pochodzenie: Erfoud, Maroko, 2001
TKW: 1200 g

Zakupiony z kolekcji Michaela Cottinghama, USA, 2007

#028

TAF - TAFASSASSET

Renazzo CR Anom - Chondryt węglisty lub Niezrównoważony prymitywny achondryt o cechach renazzo

waga: płytka 0,32g
wymiary: 4 x 6 x 3 mm
pochodzenie: pustynia Tenere, Niger, 2000
TKW: 114 kg
Historia: Twenty-six pieces with a total weight of ~110 kg were found by Bernard Dejonghe on an ancient alluvial plain. The two largest weigh ~30 kg each. Twenty stones were found on a trip in early 2000, and six more in 2001 March. The geographic coordinates of these meteorites are being withheld by the finder for three years.
Classification (M. Bourot-Denise, MNHNP): Fa29.3, pyroxene Fs24.3; ~30 vol% millimeter-sized relic chondrules are clearly visible in backscattered electron images. Textures and relative abundances of the phases vary considerably. The dominant lithology has a coarse grain size. It consists of olivine (poikilitically enclosed within pyroxenes in the relic chondrules), a small amount of plagioclase, 10% metal in rounded or oval-shaped grains often edged by chromite, and minor sulphides in small grains. The interchondrule matrix consists of subhedral crystals of olivine embedded in plagioclase and within anhedral crystals of chromite and phosphate that are up to 1 mm in size. Two distinct plagioclase compositions are present: An46.4Or2.2 in the matrix and An26.6Or5.2 in chondrule relics. A second lithology is finer grained and porous, without large metal grains but with fairly abundant sulphide grains. The large metal grains are composed of kamacite (6% Ni, 0.6% Co) and martensite (12% Ni, 0.4% Co). Some smaller metal grains associated with sulphides are made up of taenite (up to 36% Ni, 0.2% Co) with martensite cores. The sulphide is troilite (Cr 0.02–0.08%), with some grains containing inclusions of Cu-bearing pentlandite. See also Bourot-Denise et al. (2002).
Bulk chemistry (J. Zipfel and B. Spettel, MPI; H. Palme, Köln): refractory lithophiles fractionated compared to a typical CR composition, leading to possible classification as a primitive achondrite (Zipfel et al., 2002).
Oxygen isotopes (M. Javoy, IPGP): ?17O = +0.18 ą 0.08‰, ?18O = +2.94 ą 0.2‰.
Weathering grade, W0/1;
Shock stage, unknown.
Specimens: type specimen, 396 g plus five polished sections, MNHNP; main mass partly left in Niger, partly with the finder.

A 3.61 kg stone, labeled "Te-1", was found in 2000 March, probably on the same expedition noted above, and is reported by J. Otto (Frei) to have been found in the Tenere Desert at 20°45.8' N, 10°26.5' E.
Classification (J. Otto and A. Ruh, Frei): a primitive achondrite; partly covered with black fusion crust; shows a recrystallization texture with abundant 120° triple junctions dominated by olivine (56 vol%, 100–700 ľm, Fa28.7, 0.06 wt% CaO) and poikilitic orthopyroxene (23 vol%, up to 3 mm, Fs25.4Wo3.6) with exsolved clinopyroxene (Fs12.7Wo39.7); Fe-Ni metal is irregulary distributed (~10 vol%, up to 5 mm); poikilitic plagioclase occurs in interstices (6.5 vol%, An38.5Or3.7); troilite (~3.5 vol%, 0.01 wt% Ni); chromite (~1 vol%, Fe/(Fe + Mg) = 0.817, Cr/(Cr + Al) = 0.818).
Oxygen isotopes (R. Clayton and T. Mayeda, UChi): ?17O = –0.85‰, ?18O = +1.70‰, different from other achondrites.
Noble gases (L. Schultz, MPI): data compatible with those of brachinites; exposure age is ~45 Ma.
Shock stage, S1/2;
weathering grade, W0.
Specimens: main mass with Christian Stehlin, Basel; type specimen, 30.2 g and thin section, Frei.

Zakupiony z kolekcji Michaela Cottinghama, USA, 2007

#029

Hope Creek

Chondryt zwyczajny LL6, Amfoteryt

waga: płytka 0,59g
wymiary: 6 x 7 x 2 mm
pochodzenie: Hope Cree, Fairbanks North Star orough, Alaska, USA, 1998
TKW: 9830 g
Historia: Ważący 9.83 kg kamień został znaleziony za pomocą detektora metalu przez Chrisa Shawa podczas poszukiwań złota w potoku.
Klasyfikacja i minerologia(M. McGehee, G. Huss, ASU): zlepieniec; oliwin, Fa29; piroksen, Fs20.7;
Wskaźnik udaru: S3 (jasne klasty), S4 (ciemny nośnik);
Wskaźnik wietrzenia: W2
Okazy:
  • głowna masa, 5.74 kg u znalazcy;
  • ~ 2 kg - A.Shaw;
  • ~ 2 kg - O.Shaw;
  • 46.2 g - AMNH;
  • 41.8 g - UCLA
  • 32.6 g - ASU.
  • 0.59 g - TLC.

Zakupiony z kolekcji Michaela Cottinghama, USA, 2007

#030

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