are a rare class achondrites
in carbon often in the form of diamond
Ureilites are in contrary to many achondrites
not igneous differentiates, but ultramafic meteorites, which are almost
always highly fractionated.
are composed mainly of magnesian olivine, pyroxenes (often
occuring as pigeonite crystals), free (Ni-)Iron, graphite and diamond
mineral and oxygen isotopic compositions suggest that they formed
as residues from partial melting.
the fact that ureilites have undergone a planetary
differntiation history process, to some degree of surprise
also have primitive characteristics (like presence of free NiFe
and oxygen isotopic signature of primitive/unequilibrated solar
textures is often medium- to coarse-grained. The black fusion due to
high carbon content black.
many ureilites contain poly-cristalline nano-diamonds, they are pretty
hard to cut.
ureilites are subdivided into two main groups:
(for space science highly interesting is the rare) polymict
common) monomict main group
Members of this group are built
up of a mixture of distinct lithologies often highly different of each other in mineralogy
This fact and the specific values
for noble gases may point to a regolith origin for polymict ureilites.
Except clasts of the monomict
ureilite lithology, they may contain magmatic inclusions, explicit
chondrules or relics thereof and other - in the context - sometimes odd
materials and surprising mineral compositions, e.g. the extremely rare
and interesting Ferro-Silicide Suessite:
To the best of my knowledge
suessite was found on earth or in space so far only in polymict
ureilites (with the exception of the monomict ureilite NWA 1241).
According to Keil et al. (1982)
Suessite was formed during the fall as a result of silica
reacting with carbonaceous matrix, (Personal Note: likely by reduction)
Yukio Ikeda suggests in his
abstract Petrology of an unusual monomict ureilite, NWA1241 that the
suessite was produced from FeO-bearing olivine and Ni-bearing kamacite
at temperatures around 1500–1400K and oxygen fugacity of 10 −18 –10 −20
Most ureilites experienced two-stage reduction. Stage-I reduction was a
smelting process in ureilite parent bodies (UPB's) to form the
framework of monomict ureilites. Stage-II reduction took place after
catastrophic destruction of the UPB's to eject many fragmental blocks
into space, where suessite (NWA1241) or Si-bearing kamacite (common
ureilites) were produced together with the formation of reversely zoned
olivines. (Yukio Ikeda et al)
dieser Gruppe bestehen
in erster Linie aus grobkörnigen Olivinen. Begleitmineralien sind
kalzium-armer Pigeonite (ein Pyroxen). Die dunkle kohlehältige Matrix
besteht fast stets aus einem Gemenge der reinen Kohlenstoffvertreter
Graphite and Diamant. Auch freies FeNI und Troilit sind häufig)
click below on underlined meteorite title names to see more detailled
Ureilite (unclassified) from Northwestern Africa: nice material: $8/gr
4g, 16gr, 63gr
heterogenous material reaching from anomalous coarse-grained and porous
to material with more fine-grained and well-consolidated ureilitic
0.83g 7x7mm sold;
1.2g slice AURE
coarse grained with tiny Suessite trace 13x13x3mm $550, 1.1g slice AURE medium grained
polymict ureilite, Name : DAG 319
Dar al Gani , highly beautiful, diamonds!
clasts in the Dar al Gani 319 polymict ureilite: Precursors of the
ureilites (Ikeda et al)
and mineral clasts in the Dar Al Gani (DAG) 319 polymict
ureilite (Ikeda et al)
5x5mm slice $29, slice 0.51g 6x7mm $53 ; 0,65g sold!
7x7mm sold; 1.15g slice 10x13mm;
bug box (appr.0.15g appr.5x3mm) : $ 13
complete with certificate!
DaG 868 -
Ureilite (unshocked diamondrich)
containing diamonds were always thought to have been formed by impact
PTS of DaG 868
new type of Ureilite ( DaG 868 ) has been discovered and was published
features of DaG 868 seem to suggest that reconsiderations about the
origin and building history of ureilites are necessary now:
Ureilite is containing fine-grained diamonds but olivines appear to be
unshocked (show no evidence of undulose extinction!) -
found in pigeonite crystals in DaG 868 however contain diamonds!
suggests that the diamonds have not(!) been formed by shock impact or
chemical vapor deposition
such raises major questions about building history of ureilites.
transformation of graphite to diamond will be a mechanism to be
considered for this new ureilite type.
DaG 868 falls in an own group of " weakly shocked diamonds "with" the
presence of diamonds" with ALH 78019 and 78262..
A 40.03 g ureilite meteorite was found on 13th of April of 2000 by
in DaG in the Central Saharan desert.
and mineralogy (H.Takeda,Chiba and M. Ohtsuki UTok):
ureilite meteorite has a typical texture for ureilites consisting of
anhedral to subhedral olivine and pigeonite (0.9 – 3 mm across);
material forms rims around some grains or, in some cases, veins; one
plate of graphite occurs within a large pigeonite crystal;
interesting fact on this material is that the olivines appear to be
unshocked compared to most ureilites, and have homogeneous cores
reduced rims (Fa8) with high CaO contents (0.25-0.38 wt.%);
diffraction and reflected light microscopy (T. Nakamura and T.
Nakamuta, KyuU) confirm the presence of fine-grained diamonds in a
main mass with anonymous finder; type specimens, 6.33 g, NSMT; 1.8
slices BB $35; 0.1g sold ; 0,24g; 0,8g 16x15mm slice; 0.5g
30x14mm almost complete slice sold
kindly ask for availability of slices: firstname.lastname@example.org
- polymict Ureilite with (prov.) CI inclusions:
meteorite of 32.033g was found 1999 Aug.20th
are thin slices of 0,4g sold/traded, 1.4 g, 1,5g sold/traded
ask for availibility and price (limited supply) : email@example.com
DaG 977 - polymict Ureilite:
PTS of DaG 977
total mass of 17g crust was found 2000 in the desert region of DaG, Al
are slices of 0,1g sold; 0.41 g sold, 0,55g sold; 0.89g 14x12mm,
1,3g @ $88/gram;
large slice of 1.7g $130S
sections (PTS): $99/pce.
ureilite - DaG 999
fragments totaling 2,106 g were found on 2000 April 14 in the sand
Dar al Gani. Classification and mineralogy: (A. Greshake and M. Kurz):
fragmental breccia with mineral and lithic clasts set into a ureilitic
by large olivines;
core, Fa14.3-23.5; reduced olivine rims, Fa2.9-13.5;
clasts are pigeonite, Fs14.3Wo8.5 and orthopyroxene, Fs9.3;
clasts consist of fine-grained olivine (Fa22) and pyroxene
stage, S3; low degree of weathering.
specimen 20.8 g plus one polished thin section MNB
3.7g; 4.5g @$65/g; 76.8g; 111g
only through us!
polymict Ureilite DaG999 - 39.8g
fresh complete individual
80% black - blueish fusion crust
side is loosely covered with some original Saharan sand!
Ureilite (with Enstatite - pyroxene), polymict - Dar al Gani 1023
1023 is one of the world's most heavily shocked ureilites.
contains the extremely rare Ferro-Silicide Suessite. This surprising
ureilite displays also a few explicit chondrules.
August 19th 1999 , Dar Al Gani plateau Al Juffra.
ureilite meteorite of 149 g was found by an anonymous collector in the
desert. Mineralogy and classification (H. Takeda, Chiba; T.
and M. Ohtsuki, UTok): fragmental breccia, with lithic and
clasts embedded in a cataclastic matrix of predominantly
material. Lithic clasts and fragments include mafic
material (olivine 86 vol. % and pyroxene 12 vol. %),
rich plagioclase fragments
rare subrounded, dark brown Na-, K- rich glassy grain
68 wt. %, Al2O3 13.6 wt. %, MgO 5.6 wt. %,
5.3 wt. %, Na2O 6.3 wt. %, K2O 0.8 wt. %). The pyroxene
ranges from En79Wo6 to En62Wo4 and En59Wo31; olivine
ranges from Fo90 to Fo75. The plagioclase composition
from An13Ab85 to An33Ab62.
slice of a lithic clast of 3.7 2.7 cm in size
,02; 6.89 g slice), is one of the most heavily shocked ureilites known.
mafic silicates are converted into very fine grained materials
a granoblastic texture;
vein materials are lost from many grain boundaries;
shock-vein materials are observed at some parts of the thin
Olivine (80 vol. %) is more abundant than pyroxene (20 %).
composition ranges from En86Wo2 to En77Wo10 and En69Wo6;
composition ranges from Fo96 to Fo66. The ureilite meteorite is
a brownish colour in hand specimen, but in thin section the
grade appears to be very low. Specimens: type specimen,
g (including sample ,02), NSMT, one thin section, Chiba; main
with anonymous finder.
segment; 0.58g slice sold; 1.1g sold; 2.8g slice 28x24mm ; 3.1g
pairing - Available only through us!
Ureilite - DaG 1047
ureilite meteorite of TkW: 49.8 g was found 16-May-1999 by an anonymous
collector in the Dar al
Approved 24 Jul 2007 Data from: MB92 Table 1
stage: Mod ; Weathering grade: Moderate
the extremely rare Ferro-Silicide Suessite and shows a few explicit
(mol%): 3.6-22.4, Ferrosilite (mol%): 3.7-22.4, Type spec mass (g):
Classified: A. Greshake, MNB. Type specimen: MNB. Main mass: Anonymous.
Polymict breccia with fine-grained chondritic lithologies
few small segments of up to 6mm max diam are left of this rare Ureilite
ask for availibility (limited supply) : firstname.lastname@example.org
Dho 132 -
thin slice 0.33g 7x7mm $30 ; 1g 12x14mm $70; 2.9g slice $190
fresh looking, oriented ureilite meteorite (split up in 1 big and 1
small pieces) with large greenish olivine clasts of 995g was found on
15.8.2002 in the sand desert
- 7x10x6mm fragment $48
1.4g 13x15mm beautiful slice $98; 3.1g- 20x26mm slice $199
2 Ureilite (such as Hajmah (a), Donga, or Dyalpur): Dho 837
slice 15 x11mm, endpiece 2.5g, $110 BB $16
ask for availibility email@example.com
Very Unusual, Surprising: type 2 - Ureilite
the rare mineral Suessite which is a very rare metalic mineral with the
composition: (Fe,Ni) 3 Si with very low Ni content (appr. 1-3)
indicating that this material is rather not from an asteroidic parent
2 - Ureilite (such as Hajmah (a), Dingo Pup Donga, or Dyalpur)
and mineralogy: (F.Wlotzka, MPI, and M. Kurz, Germany)
282g covered with fresh fusion crust.
Olivine and pigeonite grains (up to 1mm) are set in a pavement texture
of smaller olivines containing finely dispersed metal grains.
(type 2 - medium reduced! ) FeO/MgO ratio in olivine cores: Olivine has
Fo 80-83 in the cores (with 0.7 -1.7% Cr2O3, 0.2-0.6% CaO).
Pigeonite has Fs 4-22, Wo 4-15, En 74-87, and 0.6-1.2% Cr2O3.
matrix is rare, graphite occurs in fine-grained patches. Coarser white
reflecting grains are Suessite, (Fe,Ni)3Si, with 13% Si, 2.5% Ni (range
1-4%), 1.1% Cr. This rare mineral is
abundant in NWA 1241and occurs as blocky grains or interstial vein-like
forms. No kamacite and no troilite were found.
mineralogy of NWA 1241 suggests that it was formed at extreme pressures
of appr. 100 bars and equilibration temperatures of more than 1200°C!
NWA 1241 is a valuable sample for understanding the thermal history of
ureilites parent body.
is an unusual monomict ureilite, consisting mainly of pigeonite,
olivine, suessite, and carbonaceous materials.
modal ratio of pyroxene/(olivine+pyroxene) is higher than those of
common monomict ureilites.
phases in NWA1241 are mainly suessite, although metals in common
ureilites are mainly kamacite.
high ratio of pyroxene to olivine and the abundant occurrence of
suessite make the meteorite unusual.
specimen: 20.5g MPI.
NWA 1241 9.005g.jpgNWA
1241-2 slices 1g.jpg
slice 4x5mm with crust sold; 0.24g slice 4x7mm with crust ; 1.13g
sold 1.24g slice with crust ; 3.10g beautiful slice with crust ;
13g sold12x 7 mm ; 21x16 mm ; 2.5 gr 34 x 37 mm
Achondrite from prev. Ureilite -
NWA 1500 - Prov. the first basaltic ureilite!
analysis suggest that this highy interesting achondrite could be
brachinite related and probably originated from the Winona group parent
body and may not come as originally thought from the Ureilite parent
by: Frank Wlotzka, B.Clayton, R. Bartoschewitz, Goodrich
slices $155/g; endpieces with crust $150/g
NWA 3077 -
AURE almost diamond free
piece partly covered with fresh fusion crust of 11.213g was found
early 2003 in the Occidental Sahara
Ureilite type; thin part slice with/without crust. Let us kindly
know which price/size range you might be interested in!
0,3g; 1,01g; Price BB $22
recovered mass: 9.024 kg. Classification: Typical texture of coarse
olivine (cores Fa 19.4, Cr2O3 0.55%)
(Fs 17.4, Wo 9.0, Cr2O3 1.2%).
by F. Wlotzka, Max-Planck-Inst. fur Chemie Dep.:Bartoschewitz
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