Meteoritical Bulletin, No. 93, Meteoritics
& Planetary Science 43,
Mass: 234 g
(lunar, feldspathic breccia)
and physical characteristics: A single 234 g crusted
stone was purchased in Rissani, Morocco in 2007.
The crust is fresh, dark gray to black crusted areas and vermillion to
light brown in abraded to weathered areas, some areas show melt bubbles and
flow. A network of thin fractures is filled with weathering products.
(T. Bunch and J. Wittke, NAU; A. Irving, UWS):
This stone is very dark, well indurated, and is fine-grained with few
clasts that exceed one mm in diameter. No evidence of flow orientation was
observed. NWA 4819 is a regolith breccia and has two unusual
characteristics for a lunar sample: (1) a relatively large amount of homogeneously
distributed fine-grained metallic nickel-iron (2 wt. %) and troilite (1.5
wt. %) and (2) a large population of pyroxene fragments. Most lithic clasts
follow the ferroan anorthositic trend and include anorthosites,
fine-grained anorthositic norites, gabbros, and troctolites, in addition to
shock melt clast. K-rich glass, and spherules. No intact basaltic clasts
were observed and all clasts are crushed to some extent.
compositions and geochemistry: Host orthopyroxene (Fs48.9
67.5Wo2.2 4.3; FeO/MnO = 56), exsolution lamellae (Fs24.4
41.4Wo12.3 32.9; FeO/MnO = 60). Anorthositic norite:
orthopyroxene (Fs35.4Wo4.3) and plagioclase (An96.5).
Anorthositic troctolite olivine (Fa28.1; FeO/ MnO = 105),
pigeonite (Fs26.9Wo5.9; FeO/MnO = 54), plagioclase
(An97) and chromite (cr# = 80).
Kamacite (mean Ni = 6.2, Co = 0.77 (both wt%) and taenite (Ni - 8.2 - 23.6
(R. Korotev, WUSL):
FeO = 7.0%, Ni = 290 ppm, Sm = 3.4 ppm, Th = 1.5 ppm, Ir = 12 ppb.
Achondrite (lunar, feldspathic breccia).
specimen: A total of 20.3 g
is on deposit at NAU.
The main mass holder is anonymous.