JAH 846 (ungrouped chondrite) – 12.87g

295.00$

1 in stock

Description

One of the 10 Ungrouped type 3 chondrite.  It comes from a unique parent body. “JaH 846 has many features suggestive of an UOC. It is unusual in having silica and opx in chondrules, and in oxygen isotopic compositions that plot beyond (δ18O) and below (δ17O) the ranges for OCs. We conclude it derived from a unique parent body.” (read full study : https://ui.adsabs.harvard.edu/abs/2015LPICo1856.5052Z/abstract)

Full slice

Sold with label/certificate of authenticity.  I’m the lucky finder of this meteorite.


Jiddat al Harasis 846 (JaH 846)        19.839°N, 55.870°E

Al Wusta, Oman

Find: 2011

Classification: Ordinary chondrite (type 3)

History: Found by an anonymous prospector in Oman in 2011.

Petrography: (A. Irving and S. Kuehner, UWS) Separated, well-formed, medium-sized chondrules (apparent diameter 560±380 µm, N = 40; some up to 2.2 mm) in a finer grained matrix. Minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, silica polymorph, chromite, troilite and altered kamacite. Some chondrules are devoid of olivine and are composed predominantly of orthopyroxene + a silica polymorph.

Geochemistry: Olivine (Fa0.6-38.1; Cr2O3 in ferroan olivine 0.04-0.22 wt.%, mean 0.08 wt.%, sd 0.06 wt.%, N = 9), orthopyroxene (Fs1.9-35.2Wo0.5-4.4, N = 3), clinopyoxene (Fs6.0-6.1Wo43.6-44.8, N = 2). Oxygen isotopes (K. Ziegler, UNM): analyses of 7 acid-washed subsamples by laser fluorination gave δ17O 4.988, 3.882, 4.098, 4.396, 4.262, 4.762, 4.838; δ18O 8.668, 6.724, 6.533, 7.237, 6.999, 8.155, 8.124; Δ17O 0.411, 0.332, 0.649, 0.575, 0.567, 0.456, 0.549 per mil. Magnetic susceptibility log χ (× 10-9 m3/kg) = 4.91.

Classification: Ordinary chondrite (OC3). Unusual features of this specimen include chondrules dominated by orthopyroxene + a silica polymorph, oxygen isotopic compositions closer to the TFL than for typical ordinary chondrites with similar degree of desert weathering and extending to very high δ18O values.

Specimens: Type specimen plus one polished thin section are at PSF; main mass with the anonymous finder.