hi all and glusgot
here is one of the first lodranite found in nwa classified by doctr ted bunch
there is 3 years;
its nwa 4448 a 57 gr stone very crystalised and unique in grain size and
composotion..
enjoy photo
http://www.flickr.com/photos/azizhabibi/
aziz the habibiest
Northwest Africa 4448
Algeria
Found 2005
Achondrite (lodranite)
History and physical description: A 64 g dark brown stone with little fusion
crust was found in Western Algeria in 2005 and purchased in Erfoud, Morocco in
August 2006.
Petrography (T. Bunch and J. Wittke, NAU: A. Irving, UWS): Fine-to
medium-grained stone (0.2 to 1.3 mm in dia., mean = 0.83 mm) with
recrystallized polygonal and poikilitic textures (host orthopyroxene encloses
olivine). Modal contents are (in vol. %): orthopyroxene, 68; olivine, 15;
metal, 13; troilite, pyrrhotite, chromite, merrillite, and chlor-apatite, 4.0.
Weathering grade is low and shock level is S2.
Geochemistry: Orthopyroxene (Fs11.2Wo2.2, FeO/MnO = 18); olivine (Fa10.2,
FeO/MnO = 20); metal, Ni = 5.4 wt %; pyrrhotite, Ni = 2.36 wt %; troilite, Ni =
0.56 wt %; chromite, cr# = 80; chlor-apatite (CaO = 55.6 wt %, P2O 5= 42.4 wt
%, Cl = 2.4 wt %); merrillite (CaO = 47.5 wt %, P2O5 = 46.3 wt %, MgO = 3.7 wt
% and Na2O = 2.9 wt %).
Oxygen isotopes: (D. Rumble, CIW): a cleaned and metal-free sample was
analyzed by laser fluorination. Replicate analyses are, respectively: D17O =
-1.3291 and -1.3534, d17O = 0.539 and 0.442, and d18O = 3.551 and 3.413.
Classification: Achondrite (lodranite).
Type specimens
habibi aziz imca 6220
box 70 erfoud 52200 morroco
phone. 21235576145
fax.21235576170</font>
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