New! Lunar KREEP
impact melt breccia
-
Dhofar 1442
Find 2005 TkW: 120 g in total. Fusion crust
absent.
Note: The mineralogy
of this lunaite shows by far the
highest Na2O value (appr. twice as high
as all other lunaites) as well as K2O content (K2O:
0.76) of all known lunar meteorites. Most Lunaites have a K2O
value of a seventh or less (of that of o 1442. Only
Calcalong Creek and NWA 773 have a higher K2O value than the
other lunars but still only a third of that of Dho
1442
Petrography: (Ivanova
M.A., Lorenz C.A., and Nazarov M.A., Vernad.) Meteorite is a impact melt
breccia containing lithic clasts, mineral fragments, glassy spherules,
granulites and melt breccias embedded in a fine-grained melt matrix.
It is a polymict
breccia although the matrix/clasts ratio is varying
from sample to sample of the meteorite. The lithic clasts population is
presented by anorthosites, gabbroes, olivine gabbro-norites,
gabbro-norites and norites. KREEPy and mare basalt clasts are present. The
size of the clasts ranges from 0.02-8 mm; the main
minerals are pyroxene and feldspar; minor - olivine, silica, chromite,
ilmenite, Ca-phosphate, troilite and FeNi metal.
Geochemistry: (Ivanova
M.A. and Kononkova N.N. (Vernad.) Chemical compositions of mineral phases
are: feldspar An73-96Ab3.7-24.8; clinopyroxene En2.6-69.5Wo5.6-42.8 (Fe/Mn
= 64 at.), orthopyroxene En60.8-77.1Wo1.2-4.1 (Fe/Mn = 69 at.), olivine
Fo39.9-72.2 (Fe/Mn = 93 at.); ilmenite (MgO 5.5 wt%); FeNi metal (Ni 8.0
wt%; Co 0.6 wt%). Average glassy matrix composition (wt%): SiO2 49.6; TiO2
1.76; Al2O3 17.4; Cr2O3 0.20; FeO 10.7; MnO 0.15; MgO 7.16; CaO 11.1; Na2O
0.88; K2O 0.76; P2O5 0.84.
Classification:
Achondrite (lunar KREEP impact melt breccia with minor features of
weathering.
Specimens:
A total of 21.8 g of sample and two thin sections are on deposit at Vernad.
An anonymous buyer holds the main mass of the meteorite.
18.89gr extremely beautiful
complete endpiece/ main mass with large surface area 40x36x11mm roundish
shape, greenish-brownish colour with large vessicles (up to 3mm).
On sale for a
short time ask for a fair sale price
(as
usual best price guarantee)
erich.haiderer@chello.at
