#achondrite

NWA 4587 Meteorite Thin Section

https://artsystudiofinds.etsy.com/listing/4334978620

● Wear a piece of the universe: This one-of-a-kind pendant features an authentic fragment of an Achondrite meteorite, sourced from Western Sahara and set in handcrafted sterling silver. Formed over 4.5 billion years ago through powerful igneous processes on ancient planetary bodies like asteroid Vesta, this rare stone is a true cosmic relic.

Achondrites are stony meteorites that originated from the crusts of differentiated planetary bodies, broken off by colossal asteroid impacts in deep space. Some of these fragments traveled across the solar system—eventually landing on Earth. This specific specimen was discovered by meteorite hunters in Western Sahara, making it a genuine piece of early solar system history.

NWA 5313

SKU: N/A Categories: ACHONDRITES, MARS, NWA 5313 [shergottite]

Ultra rare meteorite with an official total known weight of only 5.2 grams.

State/Prov/County: Algeria

Date: Mar-2008

Mass (g): 5.3

Pieces: 1

Class: Shergottite

Ferrosilite (mol%): 41.1

Wollastonite (mol%): 7.2

Classifier: A. Irving and S.Kuehner, UWS

Type spec mass (g): 5.3

Type spec location: UWS

Main mass: Harper

Tisserlitine 001

ACHONDRITES, MOON, Tisserlitine 001 [feldsp. breccia]

Tisserlitine 001 is an unusual and distinctive lunar specimen that is the only meteorite to be classified as having undergone hydrothermal activities*.

Two cases of mineral associations from the samples of regolith delivered by AS Luna 20 and AS Luna 24, which indicate possible hydrothermal alteration of primary lunar rocks, are considered. The probability of hydrothermal processes on the Moon means a drastic change in the firm views of the processes of the formation of lunar mineral.

Tisserlitine 001 21.325°N, 0.729°E

Gao, Mali

Find: 2019 Dec

Classification: Lunar meteorite (feldspathic breccia)

History: Beginning in December 2019 many similar dark stones were found together in the Kidal region of Mali, close to the border with Algeria. One very large stone (40026 g), another stone (4037 g) and 44 smaller stones (combined weight 3642 g) (total weight 47705 g) were purchased by Aziz Habibi in January 2020 from an Algerian dealer and subsequently acquired by Darryl Pitt. Independently, ten other stones of the same distinctive material (combined weight 8536 g) plus many smaller fragments (combined weight 1169 g) were purchased by Mbark Arjdal in February and March 2020 from a relative of the same Algerian dealer.

Physical characteristics: All specimens (many of which have a flattened slab-like form) lack fusion crust and exhibit medium-brown, “knobby” exterior surfaces. Interiors of stones have an overall tan to pinkish hue with obvious light gray, dark gray and whitish clasts plus some visible small grains of metal.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Two separate endcut specimens were studied. Both are samples of the same breccia material, composed of mineral clasts of anorthite, olivine, pigeonite, subcalcic augite, augite and orthopyroxene, plus sparse lithic clasts of spinel troctolite, set in a fine grained microvesicular matrix containing accessory altered kamacite, troilite, taenite and pentlandite. Secondary calcite is present pervasively in one of the two specimens studied and in places may be replacing original glass. Olivine grains in both studied specimens have been partially replaced by inhomogeneous phyllosilicate-rich assemblages, which apparently are hydroxylated (as evidenced by systematically low oxide analytical sums of 88-90 wt.% and absence of measurable F and Cl), and which are very Mn-deficient (yielding very elevated FeO/MnO ratios in the range 150-250). Troctolitic clasts are composed predominantly of anorthite and olivine with accessory Cr-pleonaste, low-Ca pyroxene and/or higher-Ca pyroxene.

Geochemistry: Olivine (Fa17.3-32.1, FeO/MnO = 76-100, N = 15), anorthite (An95.4-99.0Or0.2-0.0, N = 7), pigeonite (Fs18.2-26.8Wo12.4-4.7, FeO/MnO = 47-54, N = 6), orthopyroxene (Fs16.0-21.6Wo2.2-3.7, FeO/MnO = 51-66, N = 4), subcalcic augite (Fs15.9Wo31.0, FeO/MnO = 41), augite (Fs7.6-7.9Wo42.9-45.6; Fs13.8Wo38.9; FeO/MnO = 36-48, N = 3). Troctolite clast: olivine (Fa18.2-21.2, FeO/MnO = 84-92, N = 4), anorthite (An97.7Or0.0), pleonaste (mg = 0.721, cr = 0.093).

Classification: Lunar (feldspathic regolithic breccia, partially hydrothermally-altered).

Specimens: 37.6 g in the form of two polished endcuts at UWB; remainder with DPitt and Mr. M. Arjdal.

Laâyoune 002

Chute observée : Non

Année de découverte : 2022

Pays : Sahara occidental

Masse :aide 5,15 kg

Il s'agit de l'une des 346 météorites approuvées classées comme lunaires (feldsp. brèche).

Laâyoune 002

27.070°N, 13.202°W

Saguia el Hamra, Sahara occidental

Classification : Météorite lunaire (brèche feldspathique)

Histoire : Trouvé près de Laayoune , au Maroc, en janvier 2022 et acheté au chercheur par Aziz Habibi.

Caractéristiques physiques : Les deux pierres (3680 g, 1468 g) sont dépourvues de croûte de fusion et présentent une couleur grise générale similaire avec quelques clastes blanchâtres visibles.

Pétrographie : (A. Irving, UWS et P. Carpenter, WUSL ) Brèche composée de clastes minéraux d'anorthite, d'olivine, d'orthopyroxène, de pigeonite et d'augite plus d'ilménite accessoire, de chromite (avec une teneur variable en Ti) et de barytine secondaire mineure.

Géochimie : Olivine (Fa 46,3-46,7 , FeO/MnO = 94-98, N = 4), orthopyroxène (Fs 33,5 Wo 3,8 , FeO/MnO = 57), pigeonite (Fs 36,9-45,1 Wo 6,5-8,4 , FeO/MnO = 57-64, N = 3), augite (Fs 19,1-20,9 Wo 39,1-39,7 , FeO/MnO = 53-54, N = 2), anorthite (An 96,1-97,7 Ou 0,3-0,1 , N = 3).

NWA 7811

Classification : achondrite HED (eucrite, polymicte)

NWA 7811 est une fraîche météorite classée eucrite polymict breccia de seulement 95 grammes.

Elle a été découverte en 2011 et classifiée par Anthony Irving en 2012.

Les eucrites proviennent de l’Astéroïde Vesta.

Petrography: (A. Irving and S. Kuehner, UWS) Fresh fragmental breccia composed mainly of crystal debris from several different basaltic eucrite and gabbroic eucrite protoliths (with some polymineralic clasts of same), plus sparse clasts of diogenite and diogenitic orthopyroxene. Minerals include exsolved pigeonite, orthopyroxene, clinopyroxene, calcic plagioclase, silica polymorph, ilmenite, troilite, chromite, and fayalite.