Northwest Africa 1877
Purchased 2003 June
Achondrite (Olivine-rich diogenite)
A partly crusted stony meteorite (312 g) was purchased in Zagora by a Moroccan dealer for A. and G. Hupé (xHupé) in 2003 June and more of the same material (622 g) was purchased in Tagounite in 2003 December. Classification and mineralogy (A. Irving and S. Kuehner, UWS): Coarse grained, dense and somewhat friable, with an overall yellow-green color. Harzburgitic peridotite composed of subequal amounts of orthopyroxene (Fs22.4-23.3Wo1.5; FeO/MnO = 25.2-29.7) and olivine (Fa27.8, FeO/MnO = 44-50) with minor Al-poor chromite [Cr/(Cr+Al) = 84.8-88.0, Mg/(Mg+Fe) = 11.7-19.8], troilite (as abundant blebs within silicates and as inclusions in chromite), and sparse Ni-free metal (partly altered to limonite). The modal amount of olivine estimated from three serial thin sections is approximately 45%, which is consistent with the moderately high density of this meteorite. The relatively magnesian silicate compositions are similar to those in Antarctic olivine diogenite GRA 98108, and quite different from those in another Moroccan olivine diogenite NWA 1459 (Irving et al., 2003). Unlike both of these examples, however, NWA 1877 does not contain plagioclase. Specimens: type specimen, 24 g and three polished thin sections, UWS; main mass, xHupé.
NWA 1877 Ultra Rare Olivine Diogenite Meteorite .606g!
.606 gram fragment from the second "Olivine Diogenite" in private hands, found 2003 in Northwest Africa and brought back on a Hupé Brothers' expedition. A weight of only 312 grams is recorded for NWA 1877. NWA 1459, the first Olivine Diogenite available to the public weighed a mere 49 grams and was also brought back on a Hupé expedition. This material is believed to represent the deepest sample, yet recovered, from the asteroid 4Vesta. This meteorite became the fifth member counting the three that were found in Antarctica making the Olivine Diogenite now an officially recognized group. The HED group is now being called the HEDO group because of this meteorite marking an historical event. The HED group stood unchanged for decades until NWA 1877 was found making this a very important event in the history of meteoritics. Pairings have since been found but do not carry the historic importance of this specimen. This material is rarer than a Brachinite, a Chassignite or even a Lodranite by weight. Even though this is number two in private hands, it still represents the rarest of all classifications, there is nothing rarer! This specimen comes with an identification card from The Hupé Collection guarantying its historic importance.
Achondrite - Diogenite - anomalous
in Sahara, Northwest-Africa
5 Fragments in collectors display box.
The photo are only as example!