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Northwest Africa 10929
Basic information Name: Northwest Africa 10929
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10929
Observed fall: No
Year found: 2015
Country: (Northwest Africa)
Mass:help 60 g
Meteoritical Bulletin:  MB 105  (2016)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 498 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 3 Dec 2016
Writeup from MB 105:

Northwest Africa 10929 (NWA 10929)

(Northwest Africa)

Purchased: 2015

Classification: HED achondrite (Diogenite)

History: On 2015, meteorite specimens were purchased by José Antonio Sanchez Santana in the Saharawi refugee camps in Tindouf, Algeria.

Physical characteristics: Three stone fragments (34, 23 and 3 g) with black fusion crust covering 10% of the stones. A saw cut and broken surface reveals numerous mm-sized green crystals set in light-yellow groundmass.

Petrography: Petrographic description (J. Llorca, UPC). The meteorite is a orthopyroxene-rich breccia dominated by <1 to 4 mm grains set in a fine-grained cataclastic orthopyroxene matrix. The section contains about 99 vol.% orthopyroxene with accessory kamacite (50-400 ?m), troilite (30-50 ?m), Al-rich chromite (10-50 ?m) and Ca-rich pyroxene (50-100 ?m). Most accessory minerals surround large orthopyroxene grains. The section is notable for the absence of olivine and plagioclase.

Geochemistry: Mineral compositions (R.P. Lozano, IGME). Large grains and matrix unzoned orthopyroxene have the same compositions. Microprobe analyses show orthopyroxene ranges from Fs25-30Wo1-2 with a mean of Fs26.4±1.2Wo1.7±0.2 and Fe/Mn=35-47 (mean Fe/Mn=40.3±3.7) (n=17). Ca-rich pyroxene ranges are Fs9-11Wo44-46 (means: Fs9.4±1.0Wo44.5±0.8) and Fe/Mn=24-75 (mean: Fe/Mn=39.5±19.4) (n=6). The metal is kamacite whit Ni=1.3-1.5 and Co=1.1-1.2 (all in wt.%; n=16). Chromite has mean Cr/(Cr+Al)=0.93 (n=3). Bulk chemistry (J. Reyes, IGME). 0.5 grams of sample for analysis. XRF of subsample gave abundances of (in wt.%): SiO2=53.56, TiO2<0.10, Al2O3=0.52, Fe2O3=17.04, MgO=26.09, CaO=1.16 and K2O<0.10. Na2O= 0.05 wt.% by AAS. Trace elements were measured with ICP-MS (all in ppm): Be<0.1, V=85.3, Cr=2960, Co=10.7, Ni=13.9, Cu<0.5, Zn<2, As=0.14, Se<1, Mo<0.5, Ag<0.1, Cd=3.2, Sb=0.15, Ba=12.3, Tl<0.1, Pb<2, Th<0.1 and U<0.1.

Classification (R. P. Lozano, IGME). Achondrite, diogenite. Terrestrial weathering is not significant.

Specimens: Type specimen (11 g), two co-type specimens (1.0 + 2.1 g) and a probe mount are on deposit at Museo Geominero (IGME). A thin section is on deposit at UPC. José Antonio Sánchez Santana holds the main mass.

Data from:
  Table 0
  Line 0:
Place of purchase:Saharawi refugee camps, Tindouf, Algeria
Date:P 2015
Mass (g):60
Weathering grade:minor
Ferrosilite (mol%):26.4±1.2 (N=17); 9.4±1.0 (N=6)
Wollastonite (mol%):1.7±0.2; 44.5±0.8
Classifier:R.P. Lozano, IGME
Type spec mass (g):14.1
Type spec location:IGME
Main mass:José Antonio Sánchez Santana
Comments:Submitted by Rafael Pablo Lozano Fernández
   and collections
UPC: Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain, Spain (institutional address; updated 3 May 2015)
IGME: Museo Geominero, Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain (institutional address; updated 12 Dec 2012)
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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