NWA 13758 					Location Unknown
Algeria  
Purchased: 2017Classification: Rumuruti chondrite (R3)
History: A large group of identically appearing stones, found together, was purchased by a Saharan dealer from 
 a nomad in Algeria and was subsequently acquired by Mark Lyon and Dustin Dickens. The original find was reportedly 
 in the Tanezrouft Plateau, with the nearest town being Reggane, Algeria. 
 
Physical characteristics: Approximately 500 pieces ranging in mass from <1 kg to >5 kg, with a total known weight  
of approximately 100 kg. Dark brown sandblasted exterior. Saw cut reveals a breccia with fragments up to ~2 cm  
set in a fine-grained matrix. Abundant distinct chondrules are visible throughout. Two main lithologic domains exist  
within this meteorite, one has a gray, unstained matrix, and the second has a brownish-orange-stained matrix. 
 
Petrography: (C. Agee, UNM) Chondrite with mean apparent chondrule size 350±240 µm (n=21) set in abundant matrix (~35 vol%). 
 Electron microprobe analyses were performed separately on the two main lithologic domains.  
Domain "A" has compositionally unequilibrated olivine and pyroxene both in chondrules as well as single mineral fragments 
 in the matrix. Very small grains of albitic plagioclase are present. Chromite, pentlandite, and troilite are ubiquitous. 
 No metal or oxidized iron was detected. Domain "B" has compositionally unequilibrated olivine and pyroxene both in 
chondrules as well as single mineral fragments in the matrix. Domain "B" appears to have slightly more chondrules than domain "A". 
Very small grains of albitic plagioclase were present. Ti-rich chromite, pentlandite, and Ni-bearing troilite are ubiquitous. 
 No metal or oxidized iron was detected. 
 
Geochemistry: (C. Agee, UNM) Domain "A": olivine Fa36.6±8.4, CV=23%, Fe/Mn=83±15, n=12; low-Ca pyroxene Fs21.4±6.8Wo0.9±0.5, 
 Fe/Mn=39±19, n=4; augite Fs8.8±0.7Wo46.0±0.2, Fe/Mn=43±4, n=2; plagioclase An8.8±0.6Ab86.5±0.2Or4.7±0.7, n=3.  
Domain "B": olivine Fa38.7±5.8, CV=15%, Fe/Mn=87±10, n=12; low-Ca pyroxene Fs10.0±7.7Wo2.0±1.8, Fe/Mn=15±7, n=4;  
augite Fs11.4±0.9Wo44.8±1.3, Fe/Mn=51±11, n=2; plagioclase An9.2±0.9Ab85.9±1.6Or4.9±0.8, n=3. 
 
Classification: Rumuruti chondrite (R3). Domain "A" is approximately R3.7 and domain "B" is approximately R3.9, 
 based on olivine coefficient of variation (CV) after Bischoff (2000).