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  nwa 6713
(MES) Meteoritical Bulletin #99
 
 
NWA 6713
© P. Thomas
 
 

Northwest Africa 6713 (NWA 6713)
     Morocco
     Found: 2010
     Classification: Mesosiderite

History: Single stone bought in October 2010. The stone was found the same year, close to Beni Taijjite, Morocco.
Physical characteristics: Single 277 g fusion crusted stone.
Petrography: (J. Gattacceca, CEREGE): Texture is equilibrated. Silicates are orthopyroxene and plagioclase. No olivine. Large orthopyroxene crystals (to 5 mm) are visible. A large (>2 cm) orthopyroxenite clast is present. Metal and sulfides grains typically 200 μm to 1 mm. Modal abundances: silicates 80% (pyroxene 78%, plagioclase 2%), metal (kamacite and rare taenite) 10%, troilite 3%, weathering products 5%. Merrillite and chromite present. Copper grains to 80 μm associated with metal and sulfides. Weathering is moderate (~25 vol% of metal and sulfides have been oxidized). Magnetic susceptibility log χ = 5.65 (χ in 10-9 m3/kg).
Geochemistry: (J. Gattacceca, CEREGE) Orthopyroxene Fs24.8±0.3Wo2.3±0.4 (n=8). Plagioclase An92.4Ab1.5Or0.1 (n=5). Kamacite Ni=5.2 wt%, taenite Ni=36.7 wt%. Chromite Cr/(Cr+Al)=0.84. The orthopyroxenite clast (Fs17.2±0.4Wo1.7±0.1) is not equilibrated with the orthopyroxenes in the bulk of the meteorite, but its oxygen isotopic composition (δ17O = 1.82, δ18O = 3.90, and Δ17O = -0.21 (all per mil), J. Gattacceca, C. Sonzogni, CEREGE) is within the mesosiderite range.
Classification: (J. Gattacceca, CEREGE) Mesosiderite (type 3C).
Specimens: A total of 25 g and one polished section are on deposit at CEREGE. P. Thomas holds the main mass.

Place of purchase: Erfoud
Date: 2010
Mass (g): 277
Pieces: 1
Class: Mesosiderite
Magnetic suscept.: 5.65
Classifier: J. Gattacceca
Type spec mass (g): 25.3
Type spec location: CEREGE
Main mass: P. Thomas
Comments: Submitted by J. Gattacceca
 
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© P. Thomas
 
 
centimetric-scale crystal
When the "mouse over" moves on the image, the secondary image will appear. When the user "mouses out" by moving the mouse away from the image, the original image will reappear © P. Thomas
 
 
centimetric-scale crystal
When the "mouse over" moves on the image, the secondary image will appear. When the user "mouses out" by moving the mouse away from the image, the original image will reappear © P. Thomas
 
 

© J. Gattacceca
 
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