Lahmada 048 is an achondrite ureilite meteorite of only 59 grams discovered in the Western Sahara in a concentration area called Lahmada.
It was discovered on September 23, 2020 by Brahim Elguirah.
Lahmada 048 certainly contains diamonds in view of the difficulties to cut it.
The diamonds, which are rarely larger than a few micrometers in diameter, are probably the result of high-pressure shock waves produced by the collision of the parent body of the ureilites with other asteroids.
Writeup from MB 110:
Lahmada 048 27°24’20.78″N, 9°51’13.07″W
Saguia el Hamra, Western Sahara
Find: 2020 Sep 23
Classification: Ureilite
History: The meteorite was found by Brahim Elguirah. The meteorite was bought by Jean Redelsperger from Zaid Oualguirah in 2020.
Physical characteristics: A single dark brown stone
Petrography: (J. Gattacceca, CEREGE) Aggregate of blocky olivine grains (grain size 800 µm) with reduced margins. Metal, originally present along olivine rims, is almost entirely replaced by terrestrial weathering products. Contains a significant amount of carbon material, likely diamonds in view of the extreme difficulty to saw the rock.
Geochemistry: Olivine Fa21.9±0.4, CaO 0.36±0.02 wt%, CrO3 0.65±0.02, FeO/MnO = 53.4±7.9 (n=4). Olivine rim Fa5.1 (n=1).
Classification: Ureilite
Specimens: Type specimen at CEREGE. Mais mass with Jean Redelsperger.
NWA 13487 is a very nice fresh mesosiderite meteorite of only 58 grams.
Writeup from MB 109:
Northwest Africa 13487 (NWA 13487)
(Northwest Africa)
Purchased: 2019 Jun
Classification: Mesosiderite
History: Bought in Ensisheim in June 2019 from Norddine Azelmat.
Physical characteristics: A dark brown irregular stone.
Petrography: (J. Gattacceca, CEREGE) Brecciated rock with a silicate fraction composed of plagioclase and low-Ca pyroxene (typical size 200 m), and less abundant Ca-pyroxene. Abundant contorted multi-mm sized metal grains (~30 vol%). Other minerals: troilite, merrillite, SiO2.
History: Bought from Zaid Oualguirah in April 2019.
Physical characteristics: Stone with fusion crust. Interior is brown, with visible chondrules.
Petrography: (J. Gattacceca, CEREGE) Equilibrated ordinary chondrite with average plagioclase size below 50 µm. Matrix is scarce and inter-chondrule porosity is high, making chondrules well-delineated.
History: Found in september 2018 by Hammo Oulguirah. Bought in Agadir from finder.
Physical characteristics: Crusted stone with light grey interior.
Petrography: (J. Gattacceca, CEREGE) Highly recrystallized and brecciated chondrite. No relict chondrules was observed in the ~1 cm2 studied polished section. Plagioclase typical size 100 μm. Opaque minerals are Fe,Ni metal (mostly under the form of zoned taenite), FeS, chromite.
Physical characteristics: A single stone with fusion crust. Cut surface reveals a light gray interior
Petrography: Main minerals are olivine, pyroxene (with typical grain size 100 μm), plagioclase (to 200 μm). The texture is recrystallized with triple junctions and lobate grains. Rare relict chondrules. Plagioclase is found as euhedral grains and as veins between the other silicates. Ca-phosphates to 200 μm. Chromite to 50 μm. Metal as small blebs or elongated grains in the olivine.
Geochemistry: Olivine Fa 32.0±0.4 (N=4). Orthopyroxene Fs26.4±0.2 Wo1.9±0.5 (N=3). Plagioclase An10.4Or5.1 (N=3). Chromite Cr#=0.88. Magnetic susceptibility log χ =3.55 (χ in 10-9 m3/kg).
Classification: LL7 based on texture, Ca content of orthopyroxene, and plagioclase size. Weathering grade W1.
Specimens: 6.8 g and a polished section in CEREGE. Main mass with Jean Redelsperger
Jdiriya 004 is a rare and fresh rumuruti R3 chondrite weighing only 142 grams.
Magnetic susceptibility, chondrule diameters, mineral chemistry and texture suggest that it is an R3-4 breccia.
Only 10 meteorites of this type are classified to date.
The R chondrite group does not clearly belong to any of the major chondrite classes (ordinary, carbonaceous, enstatite); R chondrites have sub-solar Mg/Si and refractory/Si ratios, oxygen isotopic compositions that are above the terrestrial fractionation line and ordinary chondrites, and strongly oxidized mineralogy.
The first R chondrite, Carlisle Lakes, was found in Australia in 1977.
The main mass, 101 grams is for sale, an exceptional piece!
NWA 12731 is a rare and fresh rumuruti type R5 weighing only 29 grams.
The R chondrite group does not clearly belong to any of the major chondrite classes (ordinary, carbonaceous, enstatite); R chondrites have sub-solar Mg/Si and refractory/Si ratios, oxygen isotopic compositions that are above the terrestrial fractionation line and ordinary chondrites, and strongly oxidized mineralogy.
The first R chondrite, Carlisle Lakes, was found in Australia in 1977.
The main mass (19.5 g) of this meteorite is for sale, the rest was used to make the classification.
NWA 6419 is an ordinary chondrite of type LL3 of 339 grams, it was discovered in the Sahara in 2010.
This piece offered for sale is very representative of ordinary chondrites with nice chondrules, it is also the main mass of NWA 6419.
Ordinary chondrites are made of small balls called chondrules that have accumulated together.
Hassi Arsane 002 is an ordinary chondrite of type L6. It was found by Ahmed Ourbaa in 2019 in Morocco.
This meteorite is only 18.3 grams, I sell the main mass of 12.8 grams, the rest was used to make the classification.
NWA 10643 is a lunar meteorite of 43.6 grams discovered in 2015 near the Mauritanian border.
It was analyzed by Carl Agee who classified it lunar feldspathic breccia.
About fifteen years ago, lunar meteorites were sold for almost 1000 euros per gram!
I sell the main mass of a weight of 36.5 grams, an unique meteorite !
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