Erg chech 002 Ogrupperad akondrit. - 0.54 g - (1)

Erg Chech 002 (EC 002) 26.032°N, 1.611°W

Adrar, Algeria

Find: 2020 May

Classification: Ungrouped achondrite

History: Numerous stones containing distinctive large greenish crystals were found in May 2020 near Bir Ben Takoul, southern Algeria, within the Erg Chech sand sea. Three of these stones (weighing 1839, 467, and 207 g) were obtained by Rachid Chaoui, and two of them were subsequently purchased by Mark Lyon and one by Jason Utas. Additional stones (110, 178, 355, 360, 408, 480, 550, 587, 750, 805, 855, 1071, 1175, 1417, 1857, 2647, 3485, 3910, 4130, and 4140 g) were purchased in June and July 2020 from different Moroccan dealers by Ben Hoefnagels, Eric Twelker, Luc Labenne, Darryl Pitt, Vincent Jacques, Ziyao Wang, Marcin Cimała, Adam Aaronson, Michael Farmer and Aziz Habibi.

Physical characteristics: The stones under classification (combined weight 31.783 kg) lack fusion crust, and have an overall relatively coarse grained, tan and beige appearance with sporadic larger green, yellow-green and less commonly yellow-brown crystals (up to 9 cm by 4 cm in some specimens). Some minor reddish-brown staining is evident in the groundmass regions. This classification is based on direct analysis of samples from the 1839 g stone augmented by examination of photographs and descriptions of other stones found with them.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Unbrecciated igneous texture. Sporadic pyroxene megacrysts (ranging in size from 1.7 to 11.5 mm in the studied thin section), exhibiting angular or ellipsoidal and embayed shapes, and comprising orthopyroxene (of varying composition), pigeonite and augite occur within a dominant, medium to relatively coarse grained groundmass. The cores of each of the analyzed megacrysts are fairly homogeneous in composition, but all are mantled by zones of different composition and distinct, fine grained rim overgrowths against the groundmass parallel to grain outlines (irrespective of geometry). Some low-Ca pyroxene cores contain thin lamellae and some larger inclusions (up to 300 µm) of Ti-poor chromite. The groundmass representing the major portion of the specimens (mean grainsize ~1.5 mm) is composed predominantly of exsolved pigeonite (commonly as radiating clusters of prismatic grains) and lath-like sodic plagioclase (zoned from irregular oligoclase cores to albitic rims with oriented dagger-like K-feldspar exsolution blades) together with accessory Ti-chromite, ilmenite (some as rims on chromite), troilite, silica polymorph (with a curved "fish-scale" fracture pattern suggestive of cristobalite), merrillite, and rare Ni-poor metal (in composite grain clusters with ilmenite, Ti-chromite and troilite). Secondary weathering products include minor goethite after primary troilite and metal, and sporadic very thin veinlets of calcite.

This lot has no reserve price and comes with certificate of authenticity,
Thanks for your interest.